kernel/git/stable/linux.git/mm/damon/dbgfs.c, branch master

mm/damon: remove DAMON debugfs interface

2025-01-26T04:22:29+00:00

It's time to remove DAMON debugfs interface, which has deprecated long before in February 2023. Read the cover letter of this patch series for more details. All documents and related tests are also removed. Finally remove the interface. Link: https://lkml.kernel.org/r/20250106191941.107070-9-sj@kernel.org Signed-off-by: SeongJae Park Cc: Alex Shi Cc: Brendan Higgins Cc: David Gow Cc: Hu Haowen <2023002089@link.tyut.edu.cn> Cc: Jonathan Corbet Cc: Rae Moar Cc: Shuah Khan Cc: Yanteng Si Signed-off-by: Andrew Morton

mm/damon: remove DAMON debugfs interface kunit tests

2025-01-26T04:22:29+00:00

It's time to remove DAMON debugfs interface, which has deprecated long before in February 2023. Read the cover letter of this patch series for more details. Remove kunit tests for the interface, to prevent unnecessary test failures. Link: https://lkml.kernel.org/r/20250106191941.107070-8-sj@kernel.org Signed-off-by: SeongJae Park Cc: Alex Shi Cc: Brendan Higgins Cc: David Gow Cc: Hu Haowen <2023002089@link.tyut.edu.cn> Cc: Jonathan Corbet Cc: Rae Moar Cc: Shuah Khan Cc: Yanteng Si Signed-off-by: Andrew Morton

mm/damon: move kunit tests to tests/ subdirectory with _kunit suffix

2024-09-04T04:15:58+00:00

There was a discussion about better places for kunit test code[1] and test file name suffix[2]. Folowwing the conclusion, move kunit tests for DAMON to mm/damon/tests/ subdirectory and rename those. [1] https://lore.kernel.org/CABVgOS=pUdWb6NDHszuwb1HYws4a1-b1UmN=i8U_ED7HbDT0mg@mail.gmail.com [2] https://lore.kernel.org/CABVgOSmKwPq7JEpHfS6sbOwsR0B-DBDk_JP-ZD9s9ZizvpUjbQ@mail.gmail.com Link: https://lkml.kernel.org/r/20240827030336.7930-9-sj@kernel.org Signed-off-by: SeongJae Park Cc: Brendan Higgins Cc: David Gow Signed-off-by: Andrew Morton

mm/damon/sysfs-schemes: add target_nid on sysfs-schemes

2024-07-04T02:30:12+00:00

This patch adds target_nid under /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes// The 'target_nid' can be used as the destination node for DAMOS actions such as DAMOS_MIGRATE_{HOT,COLD} in the follow up patches. [sj@kernel.org: document target_nid file] Link: https://lkml.kernel.org/r/20240618213630.84846-3-sj@kernel.org Link: https://lkml.kernel.org/r/20240614030010.751-4-honggyu.kim@sk.com Signed-off-by: Hyeongtak Ji Signed-off-by: Honggyu Kim Signed-off-by: SeongJae Park Cc: Gregory Price Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Masami Hiramatsu (Google) Cc: Mathieu Desnoyers Cc: Rakie Kim Cc: Steven Rostedt (Google) Signed-off-by: Andrew Morton

mm/damon/dbgfs: rename monitor_on file to monitor_on_DEPRECATED

2024-02-22T18:24:46+00:00

Kernel builders could silently enable CONFIG_DAMON_DBGFS_DEPRECATED. Users who manually check the files under the DAMON debugfs directory could notice the deprecation owing to the 'DEPRECATED' DAMON debugfs file, but there could be users who doesn't manually check the files. Make the deprecation cannot be ignored in the case by renaming 'monitor_on' file, which is essential for real use of DAMON on runtime, to 'monitor_on_DEPRECATED'. Still users who control DAMON via only user-space tool could ignore the deprecation, but that's what the tool developers should take care of. DAMON user-space tool, damo, has also made a change[1] for the purpose. [1] commit 935dae76f2aee ("_damon_args: Rename --damon_interface to --damon_interface_DEPRECATED") of https://github.com/awslabs/damo Link: https://lkml.kernel.org/r/20240130013549.89538-8-sj@kernel.org Signed-off-by: SeongJae Park Cc: Alex Shi Cc: Hu Haowen <2023002089@link.tyut.edu.cn> Cc: Jonathan Corbet Cc: Shuah Khan Cc: Yanteng Si Signed-off-by: Andrew Morton

mm/damon/dbgfs: make debugfs interface deprecation message a macro

2024-02-22T18:24:45+00:00

DAMON debugfs interface deprecation message is written twice, once for the warning, and again for DEPRECATED file's read output. De-duplicate those by defining the message as a macro and reuse. [akpm@linux-foundation.org: s/comnst/const/] Link: https://lkml.kernel.org/r/20240130013549.89538-5-sj@kernel.org Signed-off-by: SeongJae Park Cc: Alex Shi Cc: Hu Haowen <2023002089@link.tyut.edu.cn> Cc: Jonathan Corbet Cc: Shuah Khan Cc: Yanteng Si Signed-off-by: Andrew Morton

mm/damon/dbgfs: implement deprecation notice file

2024-02-22T18:24:45+00:00

Implement a read-only file for DAMON debugfs interface deprecation notice, to let users who manually read/write the DAMON debugfs files from their shell command line easily notice the fact. [arnd@arndb.de: fix bogus string length] Link: https://lkml.kernel.org/r/20240202124339.892862-1-arnd@kernel.org Link: https://lkml.kernel.org/r/20240130013549.89538-4-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Arnd Bergmann Cc: Alex Shi Cc: Hu Haowen <2023002089@link.tyut.edu.cn> Cc: Jonathan Corbet Cc: Shuah Khan Cc: Yanteng Si Cc: Arnd Bergmann Signed-off-by: Andrew Morton

mm/damon: update email of SeongJae

2023-12-20T22:48:13+00:00

Patch series "mm/damon: misc updates for 6.8". Update comments, tests, and documents for DAMON. This patch (of 6): SeongJae is using his kernel.org account for DAMON development. Update the old email addresses on the comments of DAMON source files. Link: https://lkml.kernel.org/r/20231213190338.54146-1-sj@kernel.org Link: https://lkml.kernel.org/r/20231213190338.54146-2-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Signed-off-by: Andrew Morton

mm/damon/core: implement scheme-specific apply interval

2023-10-04T17:32:31+00:00

DAMON-based operation schemes are applied for every aggregation interval. That was mainly because schemes were using nr_accesses, which be complete to be used for every aggregation interval. However, the schemes are now using nr_accesses_bp, which is updated for each sampling interval in a way that reasonable to be used. Therefore, there is no reason to apply schemes for each aggregation interval. The unnecessary alignment with aggregation interval was also making some use cases of DAMOS tricky. Quotas setting under long aggregation interval is one such example. Suppose the aggregation interval is ten seconds, and there is a scheme having CPU quota 100ms per 1s. The scheme will actually uses 100ms per ten seconds, since it cannobe be applied before next aggregation interval. The feature is working as intended, but the results might not that intuitive for some users. This could be fixed by updating the quota to 1s per 10s. But, in the case, the CPU usage of DAMOS could look like spikes, and would actually make a bad effect to other CPU-sensitive workloads. Implement a dedicated timing interval for each DAMON-based operation scheme, namely apply_interval. The interval will be sampling interval aligned, and each scheme will be applied for its apply_interval. The interval is set to 0 by default, and it means the scheme should use the aggregation interval instead. This avoids old users getting any behavioral difference. Link: https://lkml.kernel.org/r/20230916020945.47296-5-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Cc: Shuah Khan Cc: Steven Rostedt (Google) Signed-off-by: Andrew Morton

mm/damon/dbgfs: print DAMON debugfs interface deprecation message

2023-02-13T23:54:33+00:00

DAMON debugfs interface has announced to be deprecated after >v5.15 LTS kernel is released. And, v6.1.y has announced to be an LTS[1]. Though the announcement was there for a while, some people might not noticed that so far. Also, some users could depend on it and have problems at movng to the alternative (DAMON sysfs interface). For such cases, warn DAMON debugfs interface deprecation with contacts to ask helps when any DAMON debugfs interface file is opened. [1] https://git.kernel.org/pub/scm/docs/kernel/website.git/commit/?id=332e9121320bc7461b2d3a79665caf153e51732c [sj@kernel.org: split DAMON debugfs file open warning message, per Randy] Link: https://lkml.kernel.org/r/20230209192009.7885-4-sj@kernel.org Link: https://lkml.kernel.org/r/20230210044838.63723-4-sj@kernel.org Link: https://lkml.kernel.org/r/20230209192009.7885-4-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Signed-off-by: Andrew Morton