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* dm writecache: count number of blocks discarded, not number of discard biosMikulas Patocka2022-07-141-1/+1
| | | | | | | | | | | Change dm-writecache, so that it counts the number of blocks discarded instead of the number of discard bios. Make it consistent with the read and write statistics counters that were changed to count the number of blocks instead of bios. Fixes: e3a35d03407c ("dm writecache: add event counters") Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
* dm writecache: count number of blocks written, not number of write biosMikulas Patocka2022-07-141-5/+5
| | | | | | | | | | | | Change dm-writecache, so that it counts the number of blocks written instead of the number of write bios. Bios can be split and requeued using the dm_accept_partial_bio function, so counting bios caused inaccurate results. Fixes: e3a35d03407c ("dm writecache: add event counters") Reported-by: Yu Kuai <yukuai1@huaweicloud.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
* dm writecache: count number of blocks read, not number of read biosMikulas Patocka2022-07-141-2/+2
| | | | | | | | | | | | Change dm-writecache, so that it counts the number of blocks read instead of the number of read bios. Bios can be split and requeued using the dm_accept_partial_bio function, so counting bios caused inaccurate results. Fixes: e3a35d03407c ("dm writecache: add event counters") Reported-by: Yu Kuai <yukuai1@huaweicloud.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
* Documentation: dm writecache: Render status list as listBagas Sanjaya2022-07-071-0/+1
| | | | | | | | | | | The status list isn't rendered as list, but rather as normal paragraph, because there is missing blank line between "Status:" line and the list. Fix the issue by adding the blank line separator. Fixes: 48debafe4f2fea ("dm: add writecache target") Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
* Documentation: dm writecache: add blank line before optional parametersMauro Carvalho Chehab2022-07-071-0/+1
| | | | | | | | Otherwise this warning occurs: Documentation/admin-guide/device-mapper/writecache.rst:23: WARNING: Unexpected indentation. Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
* dm writecache: add event countersMikulas Patocka2021-08-101-2/+14
| | | | | | | | | Add 10 counters for various events (hit, miss, etc) and export them in the status line (accessed from userspace with "dmsetup status"). Also add a message "clear_stats" that resets these counters. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
* dm writecache: make writeback pause configurableMikulas Patocka2021-06-281-2/+3
| | | | | | | | | | | | | | Commit 95b88f4d71cb953e02206be3c757083601391a0f ("dm writecache: pause writeback if cache full and origin being written directly") introduced a code that pauses cache flushing if we are issuing writes directly to the origin. Improve that initial commit by making the timeout code configurable (via the option "pause_writeback"). Also change the default from 1s to 3s because it performed better. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
* dm writecache: add optional "metadata_only" parameterMikulas Patocka2021-06-251-0/+3
| | | | | | | | | | Add a "metadata_only" parameter that when present: only metadata is promoted to the cache. This option improves performance for heavier REQ_META workloads (e.g. device-mapper-test-suite's "git clone and checkout" benchmark improves from 341s to 312s). Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
* dm writecache: add "cleaner" and "max_age" to DocumentationMike Snitzer2021-06-251-0/+17
| | | | | | | | Backfill missing Documentation. Fixes: 93de44eb3fc8 ("dm writecache: implement the "cleaner" policy") Fixes: 3923d4854e18 ("dm writecache: implement gradual cleanup") Signed-off-by: Mike Snitzer <snitzer@redhat.com>
* Documentation: fix multiple typos found in the admin-guide subdirectoryAndrew Klychkov2020-12-081-2/+2
| | | | | | | | | | | | | Fix thirty five typos in dm-integrity.rst, dm-raid.rst, dm-zoned.rst, verity.rst, writecache.rst, tsx_async_abort.rst, md.rst, bttv.rst, dvb_references.rst, frontend-cardlist.rst, gspca-cardlist.rst, ipu3.rst, remote-controller.rst, mm/index.rst, numaperf.rst, userfaultfd.rst, module-signing.rst, imx-ddr.rst, intel-speed-select.rst, intel_pstate.rst, ramoops.rst, abi.rst, kernel.rst, vm.rst Signed-off-by: Andrew Klychkov <andrew.a.klychkov@gmail.com> Link: https://lore.kernel.org/r/20201204072848.GA49895@spblnx124.lan Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* docs: device-mapper: move it to the admin-guideMauro Carvalho Chehab2019-07-151-0/+79
The DM support describes lots of aspects related to mapped disk partitions from the userspace PoV. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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