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* firmware: vpd: Drop __iomem usage for memremap() memoryStephen Boyd2019-03-271-2/+2
| | | | | | | | | | | | memremap() doesn't return an iomem pointer, so we can just use memcpy() and drop the __iomem annotation here. This silences a sparse warning. Cc: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Anton Vasilyev <vasilyev@ispras.ru> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2482: cosmetic fixes after 54865314f5a1Mariusz Bialonczyk2019-03-271-7/+11
| | | | | | | | | | | | | | | We have a helper function ds2482_calculate_config() which is calculating the config value, so just use it instead of passing the same variable in all calls to this function. Also fixes the placement of module parameters to match with: 50fa2951bd74 (w1: Organize driver source to natural/common order) by Andrew F. Davis Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> Cc: Andrew Worsley <amworsley@gmail.com> Cc: Andrew F. Davis <afd@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* char: hpet: fix a missing check of ioremapKangjie Lu2019-03-271-0/+2
| | | | | | | Check if ioremap fails, and if so, return AE_ERROR. Signed-off-by: Kangjie Lu <kjlu@umn.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* sgi-xpc: mark expected switch fall-throughGustavo A. R. Silva2019-03-271-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. This patch fixes the following warning: drivers/misc/sgi-xp/xpc_uv.c: In function ‘xpc_handle_activate_mq_msg_uv’: drivers/misc/sgi-xp/xpc_uv.c:573:3: warning: this statement may fall through [-Wimplicit-fallthrough=] xpc_wakeup_channel_mgr(part); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/misc/sgi-xp/xpc_uv.c:575:2: note: here case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV: ^~~~ Warning level 3 was used: -Wimplicit-fallthrough=3 This patch is part of the ongoing efforts to enable -Wimplicit-fallthrough. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Acked-by: Robin Holt<robinmholt@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* uio: uio_fsl_elbc_gpcm: Make dev_attr_reg_br and dev_attr_reg_or staticYueHaibing2019-03-271-2/+2
| | | | | | | | | | | | | Fix sparse warnings: drivers/uio/uio_fsl_elbc_gpcm.c:71:1: warning: symbol 'dev_attr_reg_br' was not declared. Should it be static? drivers/uio/uio_fsl_elbc_gpcm.c:72:1: warning: symbol 'dev_attr_reg_or' was not declared. Should it be static? Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Mukesh Ojha <mojha@codeaurora.org? Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: fastrpc: increase max init file size to 64 MBSrinivas Kandagatla2019-03-271-1/+1
| | | | | | | | | In some cases where Neural Processing is required the size of init process exceeds default size of 2MB, increase this size to 64MB which is required for QCS404 CDSP Neural Processing. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: fastrpc: fix remote page size calculationSrinivas Kandagatla2019-03-271-2/+9
| | | | | | | | | | | Remote page size should be calculated based on address and size, fix this! Without this we will endup with one page less in cases where the buffer is across 3 pages. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Reported-by: Krishnaiah Tadakamalla <ktadakam@qti.qualcomm.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: fastrpc: take into account of overlapping buffersSrinivas Kandagatla2019-03-271-14/+98
| | | | | | | | | | | | | | | Argument buffers that are passed could be derived from a big buffer, and some of the arguments buffers could overlap each other. Take care of such instanaces. This is optimization that DSP expects while sending buffers which overlap. So make the DSP happy doing it. Without which DSP seems to crash. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: fastrpc: consider address offset before sending to DSPSrinivas Kandagatla2019-03-271-0/+8
| | | | | | | | | While passing address phy address to DSP, take care of the offset calculated from virtual address vma. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: fastrpc: use correct spinlock variantSrinivas Kandagatla2019-03-271-19/+29
| | | | | | | | | context spin lock can be interrupted from callback path so use correct spinlock so that we do not hit spinlock recursion. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: fastrpc: make sure memory read and writes are visibleSrinivas Kandagatla2019-03-271-0/+5
| | | | | | | | | | dma_alloc_coherent buffers could have writes queued in store buffers so commit them before sending buffer to DSP using correct dma barriers. Same with vice-versa. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: fastrpc: Fix a possible double freeThierry Escande2019-03-271-11/+20
| | | | | | | | | | | | | | This patch fixes the error exit path of fastrpc_init_create_process(). If the DMA allocation or the DSP invoke fails the fastrpc_map was freed but not removed from the mapping list leading to a double free once the mapping list is emptied in fastrpc_device_release(). [srinivas kandagatla]: Cleaned up error path labels and reset init mem to NULL after free Fixes: d73f71c7c6ee("misc: fastrpc: Add support for create remote init process") Signed-off-by: Thierry Escande <thierry.escande@linaro.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: fastrpc: Avoid free of DMA buffer in interrupt contextThierry Escande2019-03-271-1/+17
| | | | | | | | | | | | | | | When the remote DSP invocation is interrupted by the user, the associated DMA buffer can be freed in interrupt context causing a kernel BUG. This patch adds a worker thread associated to the fastrpc context. It is scheduled in the rpmsg callback to decrease its refcount out of the interrupt context. Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method") Signed-off-by: Thierry Escande <thierry.escande@linaro.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: rtsx: clean up some indentingDan Carpenter2019-03-271-2/+2
| | | | | | | These lines weren't indented far enough. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mei: adjust the copyright notice in the files.Tomas Winkler2019-03-2728-26/+30
| | | | | | | | | Use unified version of the copyright notice in the files Update copyright years according the year the files were touched, except this patch and SPDX conversions. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mei/hdcp: Fix SPDX identifiersTomas Winkler2019-03-272-2/+2
| | | | | | | | | 1. Remove redundant parentheses around single license 2. Fix the license to GPL-2.0 and not GPL-2.0+ in mei_hdcp.h Cc: Ramalingam C <ramalingam.c@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* nfc/mei: convert to SPDX license tagsTomas Winkler2019-03-273-42/+8
| | | | | | | | Replace boiler plate licenses texts with the SPDX license identifiers in the mei nfc files header. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mei: convert to SPDX license tagsTomas Winkler2019-03-2723-407/+31
| | | | | | | | Replace boiler plate licenses texts with the SPDX license identifiers in the mei files header. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mei: add missing SPDX tag to mei KconfigTomas Winkler2019-03-271-0/+1
| | | | | | | Add SPDX tag with GPLv2 license to mei Kconfig. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* parport_cs: Fix memory leak in parport_configYueHaibing2019-03-271-2/+3
| | | | | | | | | parport_probe() alloc parport device 'info', but while parport_config failed it does not free it. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Mukesh Ojha <mojha@codeaurora.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Linux 5.1-rc2v5.1-rc2Linus Torvalds2019-03-241-1/+1
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* Merge tag 'ext4_for_linus_stable' of ↵Linus Torvalds2019-03-247-59/+58
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 fixes from Ted Ts'o: "Miscellaneous ext4 bug fixes for 5.1" * tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: prohibit fstrim in norecovery mode ext4: cleanup bh release code in ext4_ind_remove_space() ext4: brelse all indirect buffer in ext4_ind_remove_space() ext4: report real fs size after failed resize ext4: add missing brelse() in add_new_gdb_meta_bg() ext4: remove useless ext4_pin_inode() ext4: avoid panic during forced reboot ext4: fix data corruption caused by unaligned direct AIO ext4: fix NULL pointer dereference while journal is aborted
| * ext4: prohibit fstrim in norecovery modeDarrick J. Wong2019-03-231-0/+7
| | | | | | | | | | | | | | | | | | | | The ext4 fstrim implementation uses the block bitmaps to find free space that can be discarded. If we haven't replayed the journal, the bitmaps will be stale and we absolutely *cannot* use stale metadata to zap the underlying storage. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| * ext4: cleanup bh release code in ext4_ind_remove_space()zhangyi (F)2019-03-231-25/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | Currently, we are releasing the indirect buffer where we are done with it in ext4_ind_remove_space(), so we can see the brelse() and BUFFER_TRACE() everywhere. It seems fragile and hard to read, and we may probably forget to release the buffer some day. This patch cleans up the code by putting of the code which releases the buffers to the end of the function. Signed-off-by: zhangyi (F) <yi.zhang@huawei.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz>
| * ext4: brelse all indirect buffer in ext4_ind_remove_space()zhangyi (F)2019-03-231-4/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All indirect buffers get by ext4_find_shared() should be released no mater the branch should be freed or not. But now, we forget to release the lower depth indirect buffers when removing space from the same higher depth indirect block. It will lead to buffer leak and futher more, it may lead to quota information corruption when using old quota, consider the following case. - Create and mount an empty ext4 filesystem without extent and quota features, - quotacheck and enable the user & group quota, - Create some files and write some data to them, and then punch hole to some files of them, it may trigger the buffer leak problem mentioned above. - Disable quota and run quotacheck again, it will create two new aquota files and write the checked quota information to them, which probably may reuse the freed indirect block(the buffer and page cache was not freed) as data block. - Enable quota again, it will invoke vfs_load_quota_inode()->invalidate_bdev() to try to clean unused buffers and pagecache. Unfortunately, because of the buffer of quota data block is still referenced, quota code cannot read the up to date quota info from the device and lead to quota information corruption. This problem can be reproduced by xfstests generic/231 on ext3 file system or ext4 file system without extent and quota features. This patch fix this problem by releasing the missing indirect buffers, in ext4_ind_remove_space(). Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: zhangyi (F) <yi.zhang@huawei.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz> Cc: stable@kernel.org
| * ext4: report real fs size after failed resizeLukas Czerner2019-03-151-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently when the file system resize using ext4_resize_fs() fails it will report into log that "resized filesystem to <requested block count>". However this may not be true in the case of failure. Use the current block count as returned by ext4_blocks_count() to report the block count. Additionally, report a warning that "error occurred during file system resize" Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| * ext4: add missing brelse() in add_new_gdb_meta_bg()Lukas Czerner2019-03-151-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | Currently in add_new_gdb_meta_bg() there is a missing brelse of gdb_bh in case ext4_journal_get_write_access() fails. Additionally kvfree() is missing in the same error path. Fix it by moving the ext4_journal_get_write_access() before the ext4 sb update as Ted suggested and release n_group_desc and gdb_bh in case it fails. Fixes: 61a9c11e5e7a ("ext4: add missing brelse() add_new_gdb_meta_bg()'s error path") Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| * ext4: remove useless ext4_pin_inode()Jason Yan2019-03-151-30/+0
| | | | | | | | | | | | | | | | This function is never used from the beginning (and is commented out); let's remove it. Signed-off-by: Jason Yan <yanaijie@huawei.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| * ext4: avoid panic during forced rebootJan Kara2019-03-151-3/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When admin calls "reboot -f" - i.e., does a hard system reboot by directly calling reboot(2) - ext4 filesystem mounted with errors=panic can panic the system. This happens because the underlying device gets disabled without unmounting the filesystem and thus some syscall running in parallel to reboot(2) can result in the filesystem getting IO errors. This is somewhat surprising to the users so try improve the behavior by switching to errors=remount-ro behavior when the system is running reboot(2). Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| * ext4: fix data corruption caused by unaligned direct AIOLukas Czerner2019-03-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Ext4 needs to serialize unaligned direct AIO because the zeroing of partial blocks of two competing unaligned AIOs can result in data corruption. However it decides not to serialize if the potentially unaligned aio is past i_size with the rationale that no pending writes are possible past i_size. Unfortunately if the i_size is not block aligned and the second unaligned write lands past i_size, but still into the same block, it has the potential of corrupting the previous unaligned write to the same block. This is (very simplified) reproducer from Frank // 41472 = (10 * 4096) + 512 // 37376 = 41472 - 4096 ftruncate(fd, 41472); io_prep_pwrite(iocbs[0], fd, buf[0], 4096, 37376); io_prep_pwrite(iocbs[1], fd, buf[1], 4096, 41472); io_submit(io_ctx, 1, &iocbs[1]); io_submit(io_ctx, 1, &iocbs[2]); io_getevents(io_ctx, 2, 2, events, NULL); Without this patch the 512B range from 40960 up to the start of the second unaligned write (41472) is going to be zeroed overwriting the data written by the first write. This is a data corruption. 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 * 00009200 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 * 0000a000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 * 0000a200 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 With this patch the data corruption is avoided because we will recognize the unaligned_aio and wait for the unwritten extent conversion. 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 * 00009200 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 * 0000a200 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 * 0000b200 Reported-by: Frank Sorenson <fsorenso@redhat.com> Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Fixes: e9e3bcecf44c ("ext4: serialize unaligned asynchronous DIO") Cc: stable@vger.kernel.org
| * ext4: fix NULL pointer dereference while journal is abortedJiufei Xue2019-03-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We see the following NULL pointer dereference while running xfstests generic/475: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 PGD 8000000c84bad067 P4D 8000000c84bad067 PUD c84e62067 PMD 0 Oops: 0000 [#1] SMP PTI CPU: 7 PID: 9886 Comm: fsstress Kdump: loaded Not tainted 5.0.0-rc8 #10 RIP: 0010:ext4_do_update_inode+0x4ec/0x760 ... Call Trace: ? jbd2_journal_get_write_access+0x42/0x50 ? __ext4_journal_get_write_access+0x2c/0x70 ? ext4_truncate+0x186/0x3f0 ext4_mark_iloc_dirty+0x61/0x80 ext4_mark_inode_dirty+0x62/0x1b0 ext4_truncate+0x186/0x3f0 ? unmap_mapping_pages+0x56/0x100 ext4_setattr+0x817/0x8b0 notify_change+0x1df/0x430 do_truncate+0x5e/0x90 ? generic_permission+0x12b/0x1a0 This is triggered because the NULL pointer handle->h_transaction was dereferenced in function ext4_update_inode_fsync_trans(). I found that the h_transaction was set to NULL in jbd2__journal_restart but failed to attached to a new transaction while the journal is aborted. Fix this by checking the handle before updating the inode. Fixes: b436b9bef84d ("ext4: Wait for proper transaction commit on fsync") Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: stable@kernel.org
* | Merge branch 'sched-urgent-for-linus' of ↵Linus Torvalds2019-03-243-56/+89
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler updates from Thomas Gleixner: "Third more careful attempt for this set of fixes: - Prevent a 32bit math overflow in the cpufreq code - Fix a buffer overflow when scanning the cgroup2 cpu.max property - A set of fixes for the NOHZ scheduler logic to prevent waking up CPUs even if the capacity of the busy CPUs is sufficient along with other tweaks optimizing the behaviour for asymmetric systems (big/little)" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/fair: Skip LLC NOHZ logic for asymmetric systems sched/fair: Tune down misfit NOHZ kicks sched/fair: Comment some nohz_balancer_kick() kick conditions sched/core: Fix buffer overflow in cgroup2 property cpu.max sched/cpufreq: Fix 32-bit math overflow
| * | sched/fair: Skip LLC NOHZ logic for asymmetric systemsValentin Schneider2019-03-191-28/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The LLC NOHZ condition will become true as soon as >=2 CPUs in a single LLC domain are busy. On big.LITTLE systems, this translates to two or more CPUs of a "cluster" (big or LITTLE) being busy. Issuing a NOHZ kick in these conditions isn't desired for asymmetric systems, as if the busy CPUs can provide enough compute capacity to the running tasks, then we can leave the NOHZ CPUs in peace. Skip the LLC NOHZ condition for asymmetric systems, and rely on nr_running & capacity checks to trigger NOHZ kicks when the system actually needs them. Suggested-by: Morten Rasmussen <morten.rasmussen@arm.com> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dietmar.Eggemann@arm.com Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: vincent.guittot@linaro.org Link: https://lkml.kernel.org/r/20190211175946.4961-4-valentin.schneider@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | sched/fair: Tune down misfit NOHZ kicksValentin Schneider2019-03-191-1/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In this commit: 3b1baa6496e6 ("sched/fair: Add 'group_misfit_task' load-balance type") we set rq->misfit_task_load whenever the current running task has a utilization greater than 80% of rq->cpu_capacity. A non-zero value in this field enables misfit load balancing. However, if the task being looked at is already running on a CPU of highest capacity, there's nothing more we can do for it. We can currently spot this in update_sd_pick_busiest(), which prevents us from selecting a sched_group of group_type == group_misfit_task as the busiest group, but we don't do any of that in nohz_balancer_kick(). This means that we could repeatedly kick NOHZ CPUs when there's no improvements in terms of load balance to be done. Introduce a check_misfit_status() helper that returns true iff there is a CPU in the system that could give more CPU capacity to a rq's misfit task - IOW, there exists a CPU of higher capacity_orig or the rq's CPU is severely pressured by rt/IRQ. Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dietmar.Eggemann@arm.com Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: morten.rasmussen@arm.com Cc: vincent.guittot@linaro.org Link: https://lkml.kernel.org/r/20190211175946.4961-3-valentin.schneider@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | sched/fair: Comment some nohz_balancer_kick() kick conditionsValentin Schneider2019-03-191-2/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We now have a comment explaining the first sched_domain based NOHZ kick, so might as well comment them all. While at it, unwrap a line that fits under 80 characters. Co-authored-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dietmar.Eggemann@arm.com Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: morten.rasmussen@arm.com Cc: vincent.guittot@linaro.org Link: https://lkml.kernel.org/r/20190211175946.4961-2-valentin.schneider@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | sched/core: Fix buffer overflow in cgroup2 property cpu.maxKonstantin Khlebnikov2019-03-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add limit into sscanf format string for on-stack buffer. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Tejun Heo <tj@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Li Zefan <lizefan@huawei.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 0d5936344f30 ("sched: Implement interface for cgroup unified hierarchy") Link: https://lkml.kernel.org/r/155189230232.2620.13120481613524200065.stgit@buzz Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | sched/cpufreq: Fix 32-bit math overflowPeter Zijlstra2019-03-191-34/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Vincent Wang reported that get_next_freq() has a mult overflow bug on 32-bit platforms in the IOWAIT boost case, since in that case {util,max} are in freq units instead of capacity units. Solve this by moving the IOWAIT boost to capacity units. And since this means @max is constant; simplify the code. Reported-by: Vincent Wang <vincent.wang@unisoc.com> Tested-by: Vincent Wang <vincent.wang@unisoc.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Chunyan Zhang <zhang.lyra@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Perret <quentin.perret@arm.com> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190305083202.GU32494@hirez.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | | Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds2019-03-24110-1314/+3724
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf updates from Thomas Gleixner: "A larger set of perf updates. Not all of them are strictly fixes, but that's solely the tip maintainers fault as they let the timely -rc1 pull request fall through the cracks for various reasons including travel. So I'm sending this nevertheless because rebasing and distangling fixes and updates would be a mess and risky as well. As of tomorrow, a strict fixes separation is happening again. Sorry for the slip-up. Kernel: - Handle RECORD_MMAP vs. RECORD_MMAP2 correctly so different consumers of the mmap event get what they requested. Tools: - A larger set of updates to perf record/report/scripts vs. time stamp handling - More Python3 fixups - A pile of memory leak plumbing - perf BPF improvements and fixes - Finalize the perf.data directory storage" [ Note: the kernel part is strictly a fix, the updates are purely to tooling - Linus ] * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (75 commits) perf bpf: Show more BPF program info in print_bpf_prog_info() perf bpf: Extract logic to create program names from perf_event__synthesize_one_bpf_prog() perf tools: Save bpf_prog_info and BTF of new BPF programs perf evlist: Introduce side band thread perf annotate: Enable annotation of BPF programs perf build: Check what binutils's 'disassembler()' signature to use perf bpf: Process PERF_BPF_EVENT_PROG_LOAD for annotation perf symbols: Introduce DSO_BINARY_TYPE__BPF_PROG_INFO perf feature detection: Add -lopcodes to feature-libbfd perf top: Add option --no-bpf-event perf bpf: Save BTF information as headers to perf.data perf bpf: Save BTF in a rbtree in perf_env perf bpf: Save bpf_prog_info information as headers to perf.data perf bpf: Save bpf_prog_info in a rbtree in perf_env perf bpf: Make synthesize_bpf_events() receive perf_session pointer instead of perf_tool perf bpf: Synthesize bpf events with bpf_program__get_prog_info_linear() bpftool: use bpf_program__get_prog_info_linear() in prog.c:do_dump() tools lib bpf: Introduce bpf_program__get_prog_info_linear() perf record: Replace option --bpf-event with --no-bpf-event perf tests: Fix a memory leak in test__perf_evsel__tp_sched_test() ...
| * \ \ Merge tag 'perf-core-for-mingo-5.1-20190321' of ↵Thomas Gleixner2019-03-2278-1028/+1794
| |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent Pull perf/core improvements and fixes from Arnaldo: BPF: Song Liu: - Add support for annotating BPF programs, using the PERF_RECORD_BPF_EVENT and PERF_RECORD_KSYMBOL recently added to the kernel and plugging binutils's libopcodes disassembly of BPF programs with the existing annotation interfaces in 'perf annotate', 'perf report' and 'perf top' various output formats (--stdio, --stdio2, --tui). perf list: Andi Kleen: - Filter metrics when using substring search. perf record: Andi Kleen: - Allow to limit number of reported perf.data files - Clarify help for --switch-output. perf report: Andi Kleen - Indicate JITed code better. - Show all sort keys in help output. perf script: Andi Kleen: - Support relative time. perf stat: Andi Kleen: - Improve scaling. General: Changbin Du: - Fix some mostly error path memory and reference count leaks found using gcc's ASan and UBSan. Vendor events: Mamatha Inamdar: - Remove P8 HW events which are not supported. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| | * | | perf bpf: Show more BPF program info in print_bpf_prog_info()Song Liu2019-03-213-3/+53
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch enables showing bpf program name, address, and size in the header. Before the patch: perf report --header-only ... # bpf_prog_info of id 9 # bpf_prog_info of id 10 # bpf_prog_info of id 13 After the patch: # bpf_prog_info 9: bpf_prog_7be49e3934a125ba addr 0xffffffffa0024947 size 229 # bpf_prog_info 10: bpf_prog_2a142ef67aaad174 addr 0xffffffffa007c94d size 229 # bpf_prog_info 13: bpf_prog_47368425825d7384_task__task_newt addr 0xffffffffa0251137 size 369 Committer notes: Fix the fallback definition when HAVE_LIBBPF_SUPPORT is not defined, i.e. add the missing 'static inline' and add the __maybe_unused to the args. Also add stdio.h since we now use FILE * in bpf-event.h. Signed-off-by: Song Liu <songliubraving@fb.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Link: http://lkml.kernel.org/r/20190319165454.1298742-3-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf bpf: Extract logic to create program names from ↵Song Liu2019-03-211-27/+35
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | perf_event__synthesize_one_bpf_prog() Extract logic to create program names to synthesize_bpf_prog_name(), so that it can be reused in header.c:print_bpf_prog_info(). This commit doesn't change the behavior. Signed-off-by: Song Liu <songliubraving@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Link: http://lkml.kernel.org/r/20190319165454.1298742-2-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf tools: Save bpf_prog_info and BTF of new BPF programsSong Liu2019-03-2128-24/+145
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To fully annotate BPF programs with source code mapping, 4 different information are needed: 1) PERF_RECORD_KSYMBOL 2) PERF_RECORD_BPF_EVENT 3) bpf_prog_info 4) btf This patch handles 3) and 4) for BPF programs loaded after 'perf record|top'. For timely process of these information, a dedicated event is added to the side band evlist. When PERF_RECORD_BPF_EVENT is received via the side band event, the polling thread gathers 3) and 4) vis sys_bpf and store them in perf_env. This information is saved to perf.data at the end of 'perf record'. Committer testing: The 'wakeup_watermark' member in 'struct perf_event_attr' is inside a unnamed union, so can't be used in a struct designated initialization with older gccs, get it out of that, isolating as 'attr.wakeup_watermark = 1;' to work with all gcc versions. We also need to add '--no-bpf-event' to the 'perf record' perf_event_attr tests in 'perf test', as the way that that test goes is to intercept the events being setup and looking if they match the fields described in the control files, since now it finds first the side band event used to catch the PERF_RECORD_BPF_EVENT, they all fail. With these issues fixed: Same scenario as for testing BPF programs loaded before 'perf record' or 'perf top' starts, only start the BPF programs after 'perf record|top', so that its information get collected by the sideband threads, the rest works as for the programs loaded before start monitoring. Add missing 'inline' to the bpf_event__add_sb_event() when HAVE_LIBBPF_SUPPORT is not defined, fixing the build in systems without binutils devel files installed. Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Link: http://lkml.kernel.org/r/20190312053051.2690567-16-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf evlist: Introduce side band threadSong Liu2019-03-215-0/+155
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch introduces side band thread that captures extended information for events like PERF_RECORD_BPF_EVENT. This new thread uses its own evlist that uses ring buffer with very low watermark for lower latency. To use side band thread, we need to: 1. add side band event(s) by calling perf_evlist__add_sb_event(); 2. calls perf_evlist__start_sb_thread(); 3. at the end of perf run, perf_evlist__stop_sb_thread(). In the next patch, we use this thread to handle PERF_RECORD_BPF_EVENT. Committer notes: Add fix by Jiri Olsa for when te sb_tread can't get started and then at the end the stop_sb_thread() segfaults when joining the (non-existing) thread. That can happen when running 'perf top' or 'perf record' as a normal user, for instance. Further checks need to be done on top of this to more graciously handle these possible failure scenarios. Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Link: http://lkml.kernel.org/r/20190312053051.2690567-15-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf annotate: Enable annotation of BPF programsSong Liu2019-03-203-2/+164
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In symbol__disassemble(), DSO_BINARY_TYPE__BPF_PROG_INFO dso calls into a new function symbol__disassemble_bpf(), where annotation line information is filled based on the bpf_prog_info and btf data saved in given perf_env. symbol__disassemble_bpf() uses binutils's libopcodes to disassemble bpf programs. Committer testing: After fixing this: - u64 *addrs = (u64 *)(info_linear->info.jited_ksyms); + u64 *addrs = (u64 *)(uintptr_t)(info_linear->info.jited_ksyms); Detected when crossbuilding to a 32-bit arch. And making all this dependent on HAVE_LIBBFD_SUPPORT and HAVE_LIBBPF_SUPPORT: 1) Have a BPF program running, one that has BTF info, etc, I used the tools/perf/examples/bpf/augmented_raw_syscalls.c put in place by 'perf trace'. # grep -B1 augmented_raw ~/.perfconfig [trace] add_events = /home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.c # # perf trace -e *mmsg dnf/6245 sendmmsg(20, 0x7f5485a88030, 2, MSG_NOSIGNAL) = 2 NetworkManager/10055 sendmmsg(22<socket:[1056822]>, 0x7f8126ad1bb0, 2, MSG_NOSIGNAL) = 2 2) Then do a 'perf record' system wide for a while: # perf record -a ^C[ perf record: Woken up 68 times to write data ] [ perf record: Captured and wrote 19.427 MB perf.data (366891 samples) ] # 3) Check that we captured BPF and BTF info in the perf.data file: # perf report --header-only | grep 'b[pt]f' # event : name = cycles:ppp, , id = { 294789, 294790, 294791, 294792, 294793, 294794, 294795, 294796 }, size = 112, { sample_period, sample_freq } = 4000, sample_type = IP|TID|TIME|CPU|PERIOD, read_format = ID, disabled = 1, inherit = 1, mmap = 1, comm = 1, freq = 1, task = 1, precise_ip = 3, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1, ksymbol = 1, bpf_event = 1 # bpf_prog_info of id 13 # bpf_prog_info of id 14 # bpf_prog_info of id 15 # bpf_prog_info of id 16 # bpf_prog_info of id 17 # bpf_prog_info of id 18 # bpf_prog_info of id 21 # bpf_prog_info of id 22 # bpf_prog_info of id 41 # bpf_prog_info of id 42 # btf info of id 2 # 4) Check which programs got recorded: # perf report | grep bpf_prog | head 0.16% exe bpf_prog_819967866022f1e1_sys_enter [k] bpf_prog_819967866022f1e1_sys_enter 0.14% exe bpf_prog_c1bd85c092d6e4aa_sys_exit [k] bpf_prog_c1bd85c092d6e4aa_sys_exit 0.08% fuse-overlayfs bpf_prog_819967866022f1e1_sys_enter [k] bpf_prog_819967866022f1e1_sys_enter 0.07% fuse-overlayfs bpf_prog_c1bd85c092d6e4aa_sys_exit [k] bpf_prog_c1bd85c092d6e4aa_sys_exit 0.01% clang-4.0 bpf_prog_c1bd85c092d6e4aa_sys_exit [k] bpf_prog_c1bd85c092d6e4aa_sys_exit 0.01% clang-4.0 bpf_prog_819967866022f1e1_sys_enter [k] bpf_prog_819967866022f1e1_sys_enter 0.00% clang bpf_prog_c1bd85c092d6e4aa_sys_exit [k] bpf_prog_c1bd85c092d6e4aa_sys_exit 0.00% runc bpf_prog_819967866022f1e1_sys_enter [k] bpf_prog_819967866022f1e1_sys_enter 0.00% clang bpf_prog_819967866022f1e1_sys_enter [k] bpf_prog_819967866022f1e1_sys_enter 0.00% sh bpf_prog_c1bd85c092d6e4aa_sys_exit [k] bpf_prog_c1bd85c092d6e4aa_sys_exit # This was with the default --sort order for 'perf report', which is: --sort comm,dso,symbol If we just look for the symbol, for instance: # perf report --sort symbol | grep bpf_prog | head 0.26% [k] bpf_prog_819967866022f1e1_sys_enter - - 0.24% [k] bpf_prog_c1bd85c092d6e4aa_sys_exit - - # or the DSO: # perf report --sort dso | grep bpf_prog | head 0.26% bpf_prog_819967866022f1e1_sys_enter 0.24% bpf_prog_c1bd85c092d6e4aa_sys_exit # We'll see the two BPF programs that augmented_raw_syscalls.o puts in place, one attached to the raw_syscalls:sys_enter and another to the raw_syscalls:sys_exit tracepoints, as expected. Now we can finally do, from the command line, annotation for one of those two symbols, with the original BPF program source coude intermixed with the disassembled JITed code: # perf annotate --stdio2 bpf_prog_819967866022f1e1_sys_enter Samples: 950 of event 'cycles:ppp', 4000 Hz, Event count (approx.): 553756947, [percent: local period] bpf_prog_819967866022f1e1_sys_enter() bpf_prog_819967866022f1e1_sys_enter Percent int sys_enter(struct syscall_enter_args *args) 53.41 push %rbp 0.63 mov %rsp,%rbp 0.31 sub $0x170,%rsp 1.93 sub $0x28,%rbp 7.02 mov %rbx,0x0(%rbp) 3.20 mov %r13,0x8(%rbp) 1.07 mov %r14,0x10(%rbp) 0.61 mov %r15,0x18(%rbp) 0.11 xor %eax,%eax 1.29 mov %rax,0x20(%rbp) 0.11 mov %rdi,%rbx return bpf_get_current_pid_tgid(); 2.02 → callq *ffffffffda6776d9 2.76 mov %eax,-0x148(%rbp) mov %rbp,%rsi int sys_enter(struct syscall_enter_args *args) add $0xfffffffffffffeb8,%rsi return bpf_map_lookup_elem(pids, &pid) != NULL; movabs $0xffff975ac2607800,%rdi 1.26 → callq *ffffffffda6789e9 cmp $0x0,%rax 2.43 → je 0 add $0x38,%rax 0.21 xor %r13d,%r13d if (pid_filter__has(&pids_filtered, getpid())) 0.81 cmp $0x0,%rax → jne 0 mov %rbp,%rdi probe_read(&augmented_args.args, sizeof(augmented_args.args), args); 2.22 add $0xfffffffffffffeb8,%rdi 0.11 mov $0x40,%esi 0.32 mov %rbx,%rdx 2.74 → callq *ffffffffda658409 syscall = bpf_map_lookup_elem(&syscalls, &augmented_args.args.syscall_nr); 0.22 mov %rbp,%rsi 1.69 add $0xfffffffffffffec0,%rsi syscall = bpf_map_lookup_elem(&syscalls, &augmented_args.args.syscall_nr); movabs $0xffff975bfcd36000,%rdi add $0xd0,%rdi 0.21 mov 0x0(%rsi),%eax 0.93 cmp $0x200,%rax → jae 0 0.10 shl $0x3,%rax 0.11 add %rdi,%rax 0.11 → jmp 0 xor %eax,%eax if (syscall == NULL || !syscall->enabled) 1.07 cmp $0x0,%rax → je 0 if (syscall == NULL || !syscall->enabled) 6.57 movzbq 0x0(%rax),%rdi if (syscall == NULL || !syscall->enabled) cmp $0x0,%rdi 0.95 → je 0 mov $0x40,%r8d switch (augmented_args.args.syscall_nr) { mov -0x140(%rbp),%rdi switch (augmented_args.args.syscall_nr) { cmp $0x2,%rdi → je 0 cmp $0x101,%rdi → je 0 cmp $0x15,%rdi → jne 0 case SYS_OPEN: filename_arg = (const void *)args->args[0]; mov 0x10(%rbx),%rdx → jmp 0 case SYS_OPENAT: filename_arg = (const void *)args->args[1]; mov 0x18(%rbx),%rdx if (filename_arg != NULL) { cmp $0x0,%rdx → je 0 xor %edi,%edi augmented_args.filename.reserved = 0; mov %edi,-0x104(%rbp) augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, mov %rbp,%rdi add $0xffffffffffffff00,%rdi augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, mov $0x100,%esi → callq *ffffffffda658499 mov $0x148,%r8d augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, mov %eax,-0x108(%rbp) augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, mov %rax,%rdi shl $0x20,%rdi shr $0x20,%rdi if (augmented_args.filename.size < sizeof(augmented_args.filename.value)) { cmp $0xff,%rdi → ja 0 len -= sizeof(augmented_args.filename.value) - augmented_args.filename.size; add $0x48,%rax len &= sizeof(augmented_args.filename.value) - 1; and $0xff,%rax mov %rax,%r8 mov %rbp,%rcx return perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, &augmented_args, len); add $0xfffffffffffffeb8,%rcx mov %rbx,%rdi movabs $0xffff975fbd72d800,%rsi mov $0xffffffff,%edx → callq *ffffffffda658ad9 mov %rax,%r13 } mov %r13,%rax 0.72 mov 0x0(%rbp),%rbx mov 0x8(%rbp),%r13 1.16 mov 0x10(%rbp),%r14 0.10 mov 0x18(%rbp),%r15 0.42 add $0x28,%rbp 0.54 leaveq 0.54 ← retq # Please see 'man perf-config' to see how to control what should be seen, via ~/.perfconfig [annotate] section, for instance, one can suppress the source code and see just the disassembly, etc. Alternatively, use the TUI bu just using 'perf annotate', press '/bpf_prog' to see the bpf symbols, press enter and do the interactive annotation, which allows for dumping to a file after selecting the the various output tunables, for instance, the above without source code intermixed, plus showing all the instruction offsets: # perf annotate bpf_prog_819967866022f1e1_sys_enter Then press: 's' to hide the source code + 'O' twice to show all instruction offsets, then 'P' to print to the bpf_prog_819967866022f1e1_sys_enter.annotation file, which will have: # cat bpf_prog_819967866022f1e1_sys_enter.annotation bpf_prog_819967866022f1e1_sys_enter() bpf_prog_819967866022f1e1_sys_enter Event: cycles:ppp 53.41 0: push %rbp 0.63 1: mov %rsp,%rbp 0.31 4: sub $0x170,%rsp 1.93 b: sub $0x28,%rbp 7.02 f: mov %rbx,0x0(%rbp) 3.20 13: mov %r13,0x8(%rbp) 1.07 17: mov %r14,0x10(%rbp) 0.61 1b: mov %r15,0x18(%rbp) 0.11 1f: xor %eax,%eax 1.29 21: mov %rax,0x20(%rbp) 0.11 25: mov %rdi,%rbx 2.02 28: → callq *ffffffffda6776d9 2.76 2d: mov %eax,-0x148(%rbp) 33: mov %rbp,%rsi 36: add $0xfffffffffffffeb8,%rsi 3d: movabs $0xffff975ac2607800,%rdi 1.26 47: → callq *ffffffffda6789e9 4c: cmp $0x0,%rax 2.43 50: → je 0 52: add $0x38,%rax 0.21 56: xor %r13d,%r13d 0.81 59: cmp $0x0,%rax 5d: → jne 0 63: mov %rbp,%rdi 2.22 66: add $0xfffffffffffffeb8,%rdi 0.11 6d: mov $0x40,%esi 0.32 72: mov %rbx,%rdx 2.74 75: → callq *ffffffffda658409 0.22 7a: mov %rbp,%rsi 1.69 7d: add $0xfffffffffffffec0,%rsi 84: movabs $0xffff975bfcd36000,%rdi 8e: add $0xd0,%rdi 0.21 95: mov 0x0(%rsi),%eax 0.93 98: cmp $0x200,%rax 9f: → jae 0 0.10 a1: shl $0x3,%rax 0.11 a5: add %rdi,%rax 0.11 a8: → jmp 0 aa: xor %eax,%eax 1.07 ac: cmp $0x0,%rax b0: → je 0 6.57 b6: movzbq 0x0(%rax),%rdi bb: cmp $0x0,%rdi 0.95 bf: → je 0 c5: mov $0x40,%r8d cb: mov -0x140(%rbp),%rdi d2: cmp $0x2,%rdi d6: → je 0 d8: cmp $0x101,%rdi df: → je 0 e1: cmp $0x15,%rdi e5: → jne 0 e7: mov 0x10(%rbx),%rdx eb: → jmp 0 ed: mov 0x18(%rbx),%rdx f1: cmp $0x0,%rdx f5: → je 0 f7: xor %edi,%edi f9: mov %edi,-0x104(%rbp) ff: mov %rbp,%rdi 102: add $0xffffffffffffff00,%rdi 109: mov $0x100,%esi 10e: → callq *ffffffffda658499 113: mov $0x148,%r8d 119: mov %eax,-0x108(%rbp) 11f: mov %rax,%rdi 122: shl $0x20,%rdi 126: shr $0x20,%rdi 12a: cmp $0xff,%rdi 131: → ja 0 133: add $0x48,%rax 137: and $0xff,%rax 13d: mov %rax,%r8 140: mov %rbp,%rcx 143: add $0xfffffffffffffeb8,%rcx 14a: mov %rbx,%rdi 14d: movabs $0xffff975fbd72d800,%rsi 157: mov $0xffffffff,%edx 15c: → callq *ffffffffda658ad9 161: mov %rax,%r13 164: mov %r13,%rax 0.72 167: mov 0x0(%rbp),%rbx 16b: mov 0x8(%rbp),%r13 1.16 16f: mov 0x10(%rbp),%r14 0.10 173: mov 0x18(%rbp),%r15 0.42 177: add $0x28,%rbp 0.54 17b: leaveq 0.54 17c: ← retq Another cool way to test all this is to symple use 'perf top' look for those symbols, go there and press enter, annotate it live :-) Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Link: http://lkml.kernel.org/r/20190312053051.2690567-13-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf build: Check what binutils's 'disassembler()' signature to useSong Liu2019-03-203-2/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 003ca0fd2286 ("Refactor disassembler selection") in the binutils repo, which changed the disassembler() function signature, so we must use the feature test introduced in fb982666e380 ("tools/bpftool: fix bpftool build with bintutils >= 2.9") to deal with that. Committer testing: After adding the missing function call to test-all.c, and: FEATURE_CHECK_LDFLAGS-disassembler-four-args = -bfd -lopcodes And the fallbacks for cases where we need -liberty and sometimes -lz to tools/perf/Makefile.config, we get: $ make -C tools/perf O=/tmp/build/perf install-bin make: Entering directory '/home/acme/git/perf/tools/perf' BUILD: Doing 'make -j8' parallel build Auto-detecting system features: ... dwarf: [ on ] ... dwarf_getlocations: [ on ] ... glibc: [ on ] ... gtk2: [ on ] ... libaudit: [ on ] ... libbfd: [ on ] ... libelf: [ on ] ... libnuma: [ on ] ... numa_num_possible_cpus: [ on ] ... libperl: [ on ] ... libpython: [ on ] ... libslang: [ on ] ... libcrypto: [ on ] ... libunwind: [ on ] ... libdw-dwarf-unwind: [ on ] ... zlib: [ on ] ... lzma: [ on ] ... get_cpuid: [ on ] ... bpf: [ on ] ... libaio: [ on ] ... disassembler-four-args: [ on ] CC /tmp/build/perf/jvmti/libjvmti.o CC /tmp/build/perf/builtin-bench.o <SNIP> $ $ The feature detection test-all.bin gets successfully built and linked: $ ls -la /tmp/build/perf/feature/test-all.bin -rwxrwxr-x. 1 acme acme 2680352 Mar 19 11:07 /tmp/build/perf/feature/test-all.bin $ nm /tmp/build/perf/feature/test-all.bin | grep -w disassembler 0000000000061f90 T disassembler $ Time to move on to the patches that make use of this disassembler() routine in binutils's libopcodes. Signed-off-by: Song Liu <songliubraving@fb.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jakub Kicinski <jakub.kicinski@netronome.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Roman Gushchin <guro@fb.com> Cc: Stanislav Fomichev <sdf@google.com> Link: http://lkml.kernel.org/r/20190312053051.2690567-13-songliubraving@fb.com [ split from a larger patch, added missing FEATURE_CHECK_LDFLAGS-disassembler-four-args ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf bpf: Process PERF_BPF_EVENT_PROG_LOAD for annotationSong Liu2019-03-191-0/+54
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds processing of PERF_BPF_EVENT_PROG_LOAD, which sets proper DSO type/id/etc of memory regions mapped to BPF programs to DSO_BINARY_TYPE__BPF_PROG_INFO. Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Cc: kernel-team@fb.com Link: http://lkml.kernel.org/r/20190312053051.2690567-14-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf symbols: Introduce DSO_BINARY_TYPE__BPF_PROG_INFOSong Liu2019-03-193-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce a new dso type DSO_BINARY_TYPE__BPF_PROG_INFO for BPF programs. In symbol__disassemble(), DSO_BINARY_TYPE__BPF_PROG_INFO dso will call into a new function symbol__disassemble_bpf() in an upcoming patch, where annotation line information is filled based bpf_prog_info and btf saved in given perf_env. Committer notes: Removed the unnamed union with 'bpf_prog' and 'cache' in 'struct dso', to fix this bug when exiting 'perf top': # perf top perf: Segmentation fault -------- backtrace -------- perf[0x5a785a] /lib64/libc.so.6(+0x385bf)[0x7fd68443c5bf] perf(rb_first+0x2b)[0x4d6eeb] perf(dso__delete+0xb7)[0x4dffb7] perf[0x4f9e37] perf(perf_session__delete+0x64)[0x504df4] perf(cmd_top+0x1957)[0x454467] perf[0x4aad18] perf(main+0x61c)[0x42ec7c] /lib64/libc.so.6(__libc_start_main+0xf2)[0x7fd684428412] perf(_start+0x2d)[0x42eead] # # addr2line -fe ~/bin/perf 0x4dffb7 dso_cache__free /home/acme/git/perf/tools/perf/util/dso.c:713 That is trying to access the dso->data.cache, and that is not used with BPF programs, so we end up accessing what is in bpf_prog.first_member, b00m. Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Cc: kernel-team@fb.com Link: http://lkml.kernel.org/r/20190312053051.2690567-13-songliubraving@fb.com [ split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf feature detection: Add -lopcodes to feature-libbfdSong Liu2019-03-191-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Both libbfd and libopcodes are distributed with binutil-dev/devel. When libbfd is present, it is OK to assume that libopcodes also present. This has been a safe assumption for bpftool. This patch adds -lopcodes to perf/Makefile.config. libopcodes will be used in the next commit for BPF annotation. Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Cc: kernel-team@fb.com Link: http://lkml.kernel.org/r/20190312053051.2690567-12-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf top: Add option --no-bpf-eventSong Liu2019-03-191-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds option --no-bpf-event to 'perf top', which is the same as the option of 'perf record'. The following patches will use this option. Committer testing: # perf top -vv 2> /tmp/perf_event_attr.out # cat /tmp/perf_event_attr.out ------------------------------------------------------------ perf_event_attr: size 112 { sample_period, sample_freq } 4000 sample_type IP|TID|TIME|CPU|PERIOD read_format ID disabled 1 inherit 1 mmap 1 comm 1 freq 1 task 1 precise_ip 3 sample_id_all 1 exclude_guest 1 mmap2 1 comm_exec 1 ksymbol 1 bpf_event 1 ------------------------------------------------------------ # After this patch: # perf top --no-bpf-event -vv 2> /tmp/perf_event_attr.out # cat /tmp/perf_event_attr.out ------------------------------------------------------------ perf_event_attr: size 112 { sample_period, sample_freq } 4000 sample_type IP|TID|TIME|CPU|PERIOD read_format ID disabled 1 inherit 1 mmap 1 comm 1 freq 1 task 1 precise_ip 3 sample_id_all 1 exclude_guest 1 mmap2 1 comm_exec 1 ksymbol 1 ------------------------------------------------------------ # Signed-off-by: Song Liu <songliubraving@fb.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Cc: kernel-team@fb.com Link: http://lkml.kernel.org/r/20190312053051.2690567-11-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| | * | | perf bpf: Save BTF information as headers to perf.dataSong Liu2019-03-192-1/+101
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch enables 'perf record' to save BTF information as headers to perf.data. A new header type HEADER_BPF_BTF is introduced for this data. Committer testing: As root, being on the kernel sources top level directory, run: # perf trace -e tools/perf/examples/bpf/augmented_raw_syscalls.c -e *msg Just to compile and load a BPF program that attaches to the raw_syscalls:sys_{enter,exit} tracepoints to trace the syscalls ending in "msg" (recvmsg, sendmsg, recvmmsg, sendmmsg, etc). Make sure you have a recent enough clang, say version 9, to get the BTF ELF sections needed for this testing: # clang --version | head -1 clang version 9.0.0 (https://git.llvm.org/git/clang.git/ 7906282d3afec5dfdc2b27943fd6c0309086c507) (https://git.llvm.org/git/llvm.git/ a1b5de1ff8ae8bc79dc8e86e1f82565229bd0500) # readelf -SW tools/perf/examples/bpf/augmented_raw_syscalls.o | grep BTF [22] .BTF PROGBITS 0000000000000000 000ede 000b0e 00 0 0 1 [23] .BTF.ext PROGBITS 0000000000000000 0019ec 0002a0 00 0 0 1 [24] .rel.BTF.ext REL 0000000000000000 002fa8 000270 10 30 23 8 Then do a systemwide perf record session for a few seconds: # perf record -a sleep 2s Then look at: # perf report --header-only | grep b[pt]f # event : name = cycles:ppp, , id = { 1116204, 1116205, 1116206, 1116207, 1116208, 1116209, 1116210, 1116211 }, size = 112, { sample_period, sample_freq } = 4000, sample_type = IP|TID|TIME|PERIOD, read_format = ID, disabled = 1, inherit = 1, mmap = 1, comm = 1, freq = 1, enable_on_exec = 1, task = 1, precise_ip = 3, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1, ksymbol = 1, bpf_event = 1 # bpf_prog_info of id 13 # bpf_prog_info of id 14 # bpf_prog_info of id 15 # bpf_prog_info of id 16 # bpf_prog_info of id 17 # bpf_prog_info of id 18 # bpf_prog_info of id 21 # bpf_prog_info of id 22 # bpf_prog_info of id 51 # bpf_prog_info of id 52 # btf info of id 8 # We need to show more info about these BPF and BTF entries , but that can be done later. Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stanislav Fomichev <sdf@google.com> Cc: kernel-team@fb.com Link: http://lkml.kernel.org/r/20190312053051.2690567-10-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-02 20:39:30 +0100