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* Merge branch 'tracing-fixes-for-linus' of ↵Linus Torvalds2009-12-124-57/+242
|\ | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: tracing: Remove comparing of NULL to va_list in trace_array_vprintk() tracing: Fix function graph trace_pipe to properly display failed entries tracing: Add full state to trace_seq tracing: Buffer the output of seq_file in case of filled buffer tracing: Only call pipe_close if pipe_close is defined tracing: Add pipe_close interface
| * tracing: Remove comparing of NULL to va_list in trace_array_vprintk()Carsten Emde2009-12-091-6/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Olof Johansson stated the following: Comparing a va_list with NULL is bogus. It's supposed to be treated like an opaque type and only be manipulated with va_* accessors. Olof noticed that this code broke the ARM builds: kernel/trace/trace.c: In function 'trace_array_vprintk': kernel/trace/trace.c:1364: error: invalid operands to binary == (have 'va_list' and 'void *') kernel/trace/trace.c: In function 'tracing_mark_write': kernel/trace/trace.c:3349: error: incompatible type for argument 3 of 'trace_vprintk' This patch partly reverts c13d2f7c3231e873f30db92b96c8caa48f100f33 and re-installs the original mark_printk() mechanism. Reported-by: Olof Johansson <olof@lixom.net> Signed-off-by: Carsten Emde <C.Emde@osadl.org> LKML-Reference: <4B1BAB74.104@osadl.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| * tracing: Fix function graph trace_pipe to properly display failed entriesJiri Olsa2009-12-091-34/+131
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is a case where the graph tracer might get confused and omits displaying of a single record. This applies mostly with the trace_pipe since it is unlikely that the trace_seq buffer will overflow with the trace file. As the function_graph tracer goes through the trace entries keeping a pointer to the current record: current -> func1 ENTRY func2 ENTRY func2 RETURN func1 RETURN When an function ENTRY is encountered, it moves the pointer to the next entry to check if the function is a nested or leaf function. func1 ENTRY current -> func2 ENTRY func2 RETURN func1 RETURN If the rest of the writing of the function fills the trace_seq buffer, then the trace_pipe read will ignore this entry. The next read will Now start at the current location, but the first entry (func1) will be discarded. This patch keeps a copy of the current entry in the iterator private storage and will keep track of when the trace_seq buffer fills. When the trace_seq buffer fills, it will reuse the copy of the entry in the next iteration. [ This patch has been largely modified by Steven Rostedt in order to clean it up and simplify it. The original idea and concept was from Jirka and for that, this patch will go under his name to give him the credit he deserves. But because this was modify by Steven Rostedt anything wrong with the patch should be blamed on Steven. ] Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1259067458-27143-1-git-send-email-jolsa@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| * tracing: Add full state to trace_seqJohannes Berg2009-12-091-11/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | The trace_seq buffer might fill up, and right now one needs to check the return value of each printf into the buffer to check for that. Instead, have the buffer keep track of whether it is full or not, and reject more input if it is full or would have overflowed with an input that wasn't added. Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| * tracing: Buffer the output of seq_file in case of filled bufferSteven Rostedt2009-12-092-6/+43
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the seq_read fills the buffer it will call s_start again on the next itertation with the same position. This causes a problem with the function_graph tracer because it consumes the iteration in order to determine leaf functions. What happens is that the iterator stores the entry, and the function graph plugin will look at the next entry. If that next entry is a return of the same function and task, then the function is a leaf and the function_graph plugin calls ring_buffer_read which moves the ring buffer iterator forward (the trace iterator still points to the function start entry). The copying of the trace_seq to the seq_file buffer will fail if the seq_file buffer is full. The seq_read will not show this entry. The next read by userspace will cause seq_read to again call s_start which will reuse the trace iterator entry (the function start entry). But the function return entry was already consumed. The function graph plugin will think that this entry is a nested function and not a leaf. To solve this, the trace code now checks the return status of the seq_printf (trace_print_seq). If the writing to the seq_file buffer fails, we set a flag in the iterator (leftover) and we do not reset the trace_seq buffer. On the next call to s_start, we check the leftover flag, and if it is set, we just reuse the trace_seq buffer and do not call into the plugin print functions. Before this patch: 2) | fput() { 2) | __fput() { 2) 0.550 us | inotify_inode_queue_event(); 2) | __fsnotify_parent() { 2) 0.540 us | inotify_dentry_parent_queue_event(); After the patch: 2) | fput() { 2) | __fput() { 2) 0.550 us | inotify_inode_queue_event(); 2) 0.548 us | __fsnotify_parent(); 2) 0.540 us | inotify_dentry_parent_queue_event(); [ Updated the patch to fix a missing return 0 from the trace_print_seq() stub when CONFIG_TRACING is disabled. Reported-by: Ingo Molnar <mingo@elte.hu> ] Reported-by: Jiri Olsa <jolsa@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| * tracing: Only call pipe_close if pipe_close is definedSteven Rostedt2009-12-091-1/+1
| | | | | | | | | | | | | | | | | | This fixes a cut and paste error that had pipe_close get called if pipe_open was defined (not pipe_close). Reported-by: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com> LKML-Reference: <20091209153204.F4CD.A69D9226@jp.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| * tracing: Add pipe_close interfaceSteven Rostedt2009-12-072-0/+6
| | | | | | | | | | | | | | | | | | | | An ftrace plugin can add a pipe_open interface when the user opens trace_pipe. But if the plugin allocates something within the pipe_open it can not free it because there exists no pipe_close. The hook to the trace file open has a corresponding close. The closing of the trace_pipe file should also have a corresponding close. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
* | Merge branch 'perf-fixes-for-linus' of ↵Linus Torvalds2009-12-122-13/+33
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (57 commits) x86, perf events: Check if we have APIC enabled perf_event: Fix variable initialization in other codepaths perf kmem: Fix unused argument build warning perf symbols: perf_header__read_build_ids() offset'n'size should be u64 perf symbols: dsos__read_build_ids() should read both user and kernel buildids perf tools: Align long options which have no short forms perf kmem: Show usage if no option is specified sched: Mark sched_clock() as notrace perf sched: Add max delay time snapshot perf tools: Correct size given to memset perf_event: Fix perf_swevent_hrtimer() variable initialization perf sched: Fix for getting task's execution time tracing/kprobes: Fix field creation's bad error handling perf_event: Cleanup for cpu_clock_perf_event_update() perf_event: Allocate children's perf_event_ctxp at the right time perf_event: Clean up __perf_event_init_context() hw-breakpoints: Modify breakpoints without unregistering them perf probe: Update perf-probe document perf probe: Support --del option trace-kprobe: Support delete probe syntax ...
| * tracing/kprobes: Fix field creation's bad error handlingFrederic Weisbecker2009-12-091-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we define the common event fields in kprobe, we invert the error handling and return immediately in case of success. Then we omit to define specific kprobes fields (ip and nargs), and specific kretprobes fields (func, ret_ip, nargs). And we only define them when we fail to create common fields. The most visible consequence is that we can't create filter for k(ret)probes specific fields. This patch re-invert the success/error handling to fix it. Reported-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <1260263815-5167-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace-kprobe: Support delete probe syntaxMasami Hiramatsu2009-12-091-9/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Support delete probe syntax. The syntax is "-:[group/]event". Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20091208220316.10142.39192.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
| * hw-breakpoints: Use overflow handler instead of the event callbackFrederic Weisbecker2009-12-061-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | struct perf_event::event callback was called when a breakpoint triggers. But this is a rather opaque callback, pretty tied-only to the breakpoint API and not really integrated into perf as it triggers even when we don't overflow. We prefer to use overflow_handler() as it fits into the perf events rules, being called only when we overflow. Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
* | Merge branch 'perf-core-for-linus' of ↵Linus Torvalds2009-12-0613-347/+2645
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (470 commits) x86: Fix comments of register/stack access functions perf tools: Replace %m with %a in sscanf hw-breakpoints: Keep track of user disabled breakpoints tracing/syscalls: Make syscall events print callbacks static tracing: Add DEFINE_EVENT(), DEFINE_SINGLE_EVENT() support to docbook perf: Don't free perf_mmap_data until work has been done perf_event: Fix compile error perf tools: Fix _GNU_SOURCE macro related strndup() build error trace_syscalls: Remove unused syscall_name_to_nr() trace_syscalls: Simplify syscall profile trace_syscalls: Remove duplicate init_enter_##sname() trace_syscalls: Add syscall_nr field to struct syscall_metadata trace_syscalls: Remove enter_id exit_id trace_syscalls: Set event_enter_##sname->data to its metadata trace_syscalls: Remove unused event_syscall_enter and event_syscall_exit perf_event: Initialize data.period in perf_swevent_hrtimer() perf probe: Simplify event naming perf probe: Add --list option for listing current probe events perf probe: Add argv_split() from lib/argv_split.c perf probe: Move probe event utility functions to probe-event.c ...
| * trace_syscalls: Remove unused syscall_name_to_nr()Lai Jiangshan2009-12-011-16/+0
| | | | | | | | | | | | | | | | | | | | | | After duplications are removed, syscall_name_to_nr() is unused. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B14D2A6.6060803@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_syscalls: Simplify syscall profileLai Jiangshan2009-12-011-16/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | use only one prof_sysenter_enable() instead of prof_sysenter_enable_##sname() use only one prof_sysenter_disable() instead of prof_sysenter_disable_##sname() use only one prof_sysexit_enable() instead of prof_sysexit_enable_##sname() use only one prof_sysexit_disable() instead of prof_sysexit_disable_##sname() Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B14D2A1.8060304@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_syscalls: Remove duplicate init_enter_##sname()Lai Jiangshan2009-12-011-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | use only one init_syscall_trace instead of many init_enter_##sname()/init_exit_##sname() Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B14D29B.6090708@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_syscalls: Add syscall_nr field to struct syscall_metadataLai Jiangshan2009-12-011-13/+9
| | | | | | | | | | | | | | | | | | | | | | | | Add syscall_nr field to struct syscall_metadata, it helps us to get syscall number easier. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B14D293.6090800@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_syscalls: Remove enter_id exit_idLai Jiangshan2009-12-011-20/+10
| | | | | | | | | | | | | | | | | | | | | | | | use ->enter_event->id instead of ->enter_id use ->exit_event->id instead of ->exit_id Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B14D288.7030001@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_syscalls: Set event_enter_##sname->data to its metadataLai Jiangshan2009-12-011-25/+11
| | | | | | | | | | | | | | | | | | | | | | | | Set event_enter_##sname->data to its metadata, it makes codes simpler. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B14D282.7050709@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_syscalls: Remove unused event_syscall_enter and event_syscall_exitLai Jiangshan2009-12-011-8/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | fix event_enter_##sname->event fix event_exit_##sname->event remove unused event_syscall_enter and event_syscall_exit Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B14D278.4090209@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_kprobes: Fix a memory leak bug and check kstrdup() return valueMasami Hiramatsu2009-12-011-7/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix a memory leak case in create_trace_probe(). When an argument is too long (> MAX_ARGSTR_LEN), it just jumps to error path. In that case tp->args[i].name is not released. This also fixes a bug to check kstrdup()'s return value. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091201001919.10235.56455.stgit@harusame> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_kprobes: Don't output zero offsetLai Jiangshan2009-11-271-3/+9
| | | | | | | | | | | | | | | | | | | | | | | | "symbol_name+0" is not so friendly. It makes the output longer. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B0CEBCB.7080309@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_kprobes: Always show group nameLai Jiangshan2009-11-271-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Sometimes the group name is not "kprobes", It'll be better if we can read it from tracing/kprobe_events. # echo 'r:laijs/vfs_read vfs_read %ax' > kprobe_events # cat kprobe_events r:laijs/vfs_read vfs_read %ax=%ax Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B0CEBAF.6000104@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_kprobes: Fix memory leakLai Jiangshan2009-11-271-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | tp->nr_args is not set before we "goto error", it causes memory leak for free_trace_probe() use tp->nr_args to free memory of args. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4B0CEB95.2060107@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace_syscalls: Add syscall nr fieldLai Jiangshan2009-11-271-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Field syscall number is missed in syscall_enter_define_fields()/ syscall_exit_define_fields(). Syscall number is also needed for event filter or other users. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4B0E330D.1070206@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * hw-breakpoints: Use struct perf_event_attr to define kernel breakpointsFrederic Weisbecker2009-11-271-22/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Kernel breakpoints are created using functions in which we pass breakpoint parameters as individual variables: address, length and type. Although it fits well for x86, this just does not scale across architectures that may support this api later as these may have more or different needs. Pass in a perf_event_attr structure instead because it is meant to evolve as much as possible into a generic hardware breakpoint parameter structure. Reported-by: K.Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1259294154-5197-2-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * hw-breakpoints: Simplify error handling in breakpoint creation requestsFrederic Weisbecker2009-11-261-12/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This simplifies the error handling when we create a breakpoint. We don't need to check the NULL return value corner case anymore since we have improved perf_event_create_kernel_counter() to always return an error code in the failure case. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Prasad <prasad@linux.vnet.ibm.com> LKML-Reference: <1259210142-5714-3-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * ksym_tracer: Fix breakpoint removal after modificationFrederic Weisbecker2009-11-261-2/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The error path of a breakpoint modification is broken in the ksym tracer. A modified breakpoint hlist node is immediately released after its removal. Also we leak a breakpoint in this case. Fix the path. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Prasad <prasad@linux.vnet.ibm.com> LKML-Reference: <1259210142-5714-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * trace/syscalls: Change ret param in struct syscall_trace_exit to longTom Zanussi2009-11-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit ee949a86b3aef15845ea677aa60231008de62672 ("tracing/syscalls: Use long for syscall ret format and field definitions") changed the syscall exit return type to long, but forgot to change it in the struct. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1259133299-23594-3-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf_events: Undo some recursion damagePeter Zijlstra2009-11-232-12/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Make perf_swevent_get_recursion_context return a context number and disable preemption. This could be used to remove the IRQ disable from the trace bit and index the per-cpu buffer with. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <20091123103819.993226816@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * tracing: Forget about the NMI buffer for syscall eventsFrederic Weisbecker2009-11-221-8/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We are never in an NMI context when we commit a syscall trace to perf. So just forget about the nmi buffer there. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jason Baron <jbaron@redhat.com> LKML-Reference: <1258863695-10464-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * tracing: Use the perf recursion protection from trace eventFrederic Weisbecker2009-11-223-66/+43
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we commit a trace to perf, we first check if we are recursing in the same buffer so that we don't mess-up the buffer with a recursing trace. But later on, we do the same check from perf to avoid commit recursion. The recursion check is desired early before we touch the buffer but we want to do this check only once. Then export the recursion protection from perf and use it from the trace events before submitting a trace. v2: Put appropriate Reported-by tag Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Jason Baron <jbaron@redhat.com> LKML-Reference: <1258864015-10579-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * Merge branch 'tracing/hw-breakpoints' into perf/coreIngo Molnar2009-11-216-0/+654
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/x86/kernel/kprobes.c kernel/trace/Makefile Merge reason: hw-breakpoints perf integration is looking good in testing and in reviews, plus conflicts are mounting up - so merge & resolve. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * ksym_tracer: Support read accesses independent of read/write.Paul Mundt2009-11-101-1/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All of the infrastructure already exists to support read accesses for platforms that support a read access independently of read/write (such as in the case of the SuperH UBC). This just trivially hooks up the read case by itself. Signed-off-by: Paul Mundt <lethal@linux-sh.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Prasad <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jan Kiszka <jan.kiszka@web.de> Cc: Jiri Slaby <jirislaby@gmail.com> Cc: Avi Kivity <avi@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Arjan van de Ven <arjan@linux.intel.com> LKML-Reference: <20091109083733.GA25848@linux-sh.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| | * ksym_tracer: Remove KSYM_SELFTEST_ENTRYLi Zefan2009-11-082-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | The macro used to be used in both trace_selftest.c and trace_ksym.c, but no longer, so remove it from header file. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| | * hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf eventsFrederic Weisbecker2009-11-084-74/+66
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch rebase the implementation of the breakpoints API on top of perf events instances. Each breakpoints are now perf events that handle the register scheduling, thread/cpu attachment, etc.. The new layering is now made as follows: ptrace kgdb ftrace perf syscall \ | / / \ | / / / Core breakpoint API / / | / | / Breakpoints perf events | | Breakpoints PMU ---- Debug Register constraints handling (Part of core breakpoint API) | | Hardware debug registers Reasons of this rewrite: - Use the centralized/optimized pmu registers scheduling, implying an easier arch integration - More powerful register handling: perf attributes (pinned/flexible events, exclusive/non-exclusive, tunable period, etc...) Impact: - New perf ABI: the hardware breakpoints counters - Ptrace breakpoints setting remains tricky and still needs some per thread breakpoints references. Todo (in the order): - Support breakpoints perf counter events for perf tools (ie: implement perf_bpcounter_event()) - Support from perf tools Changes in v2: - Follow the perf "event " rename - The ptrace regression have been fixed (ptrace breakpoint perf events weren't released when a task ended) - Drop the struct hw_breakpoint and store generic fields in perf_event_attr. - Separate core and arch specific headers, drop asm-generic/hw_breakpoint.h and create linux/hw_breakpoint.h - Use new generic len/type for breakpoint - Handle off case: when breakpoints api is not supported by an arch Changes in v3: - Fix broken CONFIG_KVM, we need to propagate the breakpoint api changes to kvm when we exit the guest and restore the bp registers to the host. Changes in v4: - Drop the hw_breakpoint_restore() stub as it is only used by KVM - EXPORT_SYMBOL_GPL hw_breakpoint_restore() as KVM can be built as a module - Restore the breakpoints unconditionally on kvm guest exit: TIF_DEBUG_THREAD doesn't anymore cover every cases of running breakpoints and vcpu->arch.switch_db_regs might not always be set when the guest used debug registers. (Waiting for a reliable optimization) Changes in v5: - Split-up the asm-generic/hw-breakpoint.h moving to linux/hw_breakpoint.h into a separate patch - Optimize the breakpoints restoring while switching from kvm guest to host. We only want to restore the state if we have active breakpoints to the host, otherwise we don't care about messed-up address registers. - Add asm/hw_breakpoint.h to Kbuild - Fix bad breakpoint type in trace_selftest.c Changes in v6: - Fix wrong header inclusion in trace.h (triggered a build error with CONFIG_FTRACE_SELFTEST Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Prasad <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jan Kiszka <jan.kiszka@web.de> Cc: Jiri Slaby <jirislaby@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Avi Kivity <avi@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Paul Mundt <lethal@linux-sh.org>
| | * Merge commit 'perf/core' into perf/hw-breakpointFrederic Weisbecker2009-10-1830-1481/+2060
| | |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: kernel/Makefile kernel/trace/Makefile kernel/trace/trace.h samples/Makefile Merge reason: We need to be uptodate with the perf events development branch because we plan to rewrite the breakpoints API on top of perf events.
| | * | tracing: Fix ring-buffer and ksym tracer merge interactionFrederic Weisbecker2009-09-071-4/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The compiler warns us about: kernel/trace/trace_ksym.c: In function ksym_hbp_handler: kernel/trace/trace_ksym.c:92: attention : passing argument 1 of trace_buffer_lock_reserve from incompatible pointer type kernel/trace/trace_ksym.c:106: attention : passing argument 1 of trace_buffer_unlock_commit from incompatible pointer type Commit "e77405ad" (tracing: pass around ring buffer instead of tracer) has changed the central tracing APIs. And this change has updated every callsites of these APIs except those that aren't in tracing/core, such as the ksym tracer. Cc: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | Merge branch 'tracing/core' into tracing/hw-breakpointsIngo Molnar2009-09-0729-1386/+2829
| | |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/Kconfig kernel/trace/trace.h Merge reason: resolve the conflicts, plus adopt to the new ring-buffer APIs. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | tracing/ksym_tracer: support quick clear for ksym_trace_filter -- v2Xiao Guangrong2009-07-241-18/+35
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It's rather boring to clear symbol one by one in ksym_trace_filter file, so, this patch will let ksym_trace_filter file support quickly clear all break points. We can write "0" to this file and it will clear all symbols for example: # cat ksym_trace_filter ksym_filter_head:rw- global_trace:rw- # echo 0 > ksym_trace_filter # cat ksym_trace_filter # Changelog v1->v2: Add other ways to clear all breakpoints by writing NULL or "*:---" to ksym_trace_filter file base on K.Prasad's suggestion Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> LKML-Reference: <4A67E092.3080202@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| | * | | tracing/ksym_tracer: fix write operation of ksym_trace_filterXiao Guangrong2009-07-241-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fix 2 bugs: - fix the return value of ksym_trace_filter_write() when we want to clear symbol in ksym_trace_filter file for example: # echo global_trace:rw- > /debug/tracing/ksym_trace_filter # echo global_trace:--- > /debug/tracing/ksym_trace_filter -bash: echo: write error: Invalid argument # cat /debug/tracing/ksym_trace_filter # We want to clear 'global_trace' in ksym_trace_filter, it complain with "Invalid argument", but the operation is successful - the "r--" access types is not allowed, but ksym_trace_filter file think it OK for example: # echo ksym_tracer_mutex:r-- > ksym_trace_filter -bash: echo: write error: Resource temporarily unavailable # dmesg ksym_tracer request failed. Try again later!! The error occur at register_kernel_hw_breakpoint(), but It's should at access types parser Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> LKML-Reference: <4A66863D.5090802@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| | * | | tracing/ksym_tracer: fix the output of ksym tracerXiao Guangrong2009-07-241-7/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix the output format of ksym tracer, make it properly aligned Befor patch: # tracer: ksym_tracer # # TASK-PID CPU# Symbol Type Function # | | | | | bash 1378 1 ksym_tracer_mutex W mutex_lock+0x11/0x27 bash 1378 1 ksym_filter_head W process_new_ksym_entry+0xd2/0x10c bash 1378 1 ksym_tracer_mutex W mutex_unlock+0x12/0x1b cat 1429 0 ksym_tracer_mutex W mutex_lock+0x11/0x27 After patch: # tracer: ksym_tracer # # TASK-PID CPU# Symbol Type Function # | | | | | cat-1423 [000] ksym_tracer_mutex RW mutex_lock+0x11/0x27 cat-1423 [000] ksym_filter_head RW ksym_trace_filter_read+0x6e/0x10d cat-1423 [000] ksym_tracer_mutex RW mutex_unlock+0x12/0x1b cat-1423 [000] ksym_tracer_mutex RW mutex_lock+0x11/0x27 cat-1423 [000] ksym_filter_head RW ksym_trace_filter_read+0x6e/0x10d cat-1423 [000] ksym_tracer_mutex RW mutex_unlock+0x12/0x1b Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> LKML-Reference: <4A6685BB.2090809@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| | * | | ksym_tracer: Fix the output of stat tracingLi Zefan2009-07-101-9/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - make ksym_tracer_stat_start() return head->first instead of &head->first - make the output properly aligned Before: Access type Symbol Counter NA <NA> 0 RW pid_max 0 After: Access Type Symbol Counter ----------- ------ ------- RW pid_max 0 Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E346.5050608@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | ksym_tracer: Fix memory leakLi Zefan2009-07-101-34/+27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - When remove a filter, we leak entry->ksym_hbp->info.name. - With CONFIG_FTRAC_SELFTEST enabled, we leak ->info.name: # echo ksym_tracer > current_tracer # echo 'ksym_selftest_dummy:rw-' > ksym_trace_filter # echo nop > current_tracer Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E328.8010200@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | ksym_tracer: Report error when failed to re-register hbpLi Zefan2009-07-101-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When access type is changed, the hw break point will be unregistered and then be registered again with new access type. But the registration may fail, in this case, -errno should be returned. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E314.7070004@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | ksym_tracer: NIL-terminate user input filterLi Zefan2009-07-101-5/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make sure the user input string is NULL-terminated. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E300.7020601@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | ksym_tracer: Fix validation of length of access typeLi Zefan2009-07-101-7/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Don't take newline into account, otherwise: # echo 'pid_max:-w-' > ksym_trace_filter # echo -n 'pid_max:rw-' > ksym_trace_filter bash: echo: write error: Invalid argument Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E2EB.9070503@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | ksym_tracer: Fix validation of access typeLi Zefan2009-07-101-18/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | # echo 'pid_max:rw-' > ksym_trace_filter # cat ksym_trace_filter pid_max:rw- # echo 'pid_max:ww-' > ksym_trace_filter (should return -EINVAL) # cat ksym_trace_filter (but it ended up removing filter entry) Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E2CE.6080409@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | ksym_tracer: Rewrite ksym_trace_filter_read()Li Zefan2009-07-101-11/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Reading ksym_trace_filter gave me some arbitrary characters, when it should show nothing. It's because buf is not initialized when there's no filter. Also reduce stack usage by about 512 bytes. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E2B4.6030706@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | ksym_tracer: Extract trace entry from struct trace_ksymLi Zefan2009-07-102-17/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | struct trace_ksym is used as an entry in hbp list, and is also used as trace_entry stored in ring buffer. This is not necessary and is a waste of memory in ring buffer. There is also a bug that dereferencing field->ksym_hbp in ksym_trace_output() can be invalid. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A52E2A4.4050007@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | Merge branch 'linus' into tracing/hw-breakpointsIngo Molnar2009-06-1713-138/+357
| | |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/x86/Kconfig arch/x86/kernel/traps.c arch/x86/power/cpu.c arch/x86/power/cpu_32.c kernel/Makefile Semantic conflict: arch/x86/kernel/hw_breakpoint.c Merge reason: Resolve the conflicts, move from put_cpu_no_sched() to put_cpu() in arch/x86/kernel/hw_breakpoint.c. Signed-off-by: Ingo Molnar <mingo@elte.hu>
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 05:52:04 +0100