+ mm-damon-core-use-nr_accesses_bp-as-a-source-of-damos_before_apply-tracepoint.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/damon/core: use nr_accesses_bp as a source of damos_before_apply tracepoint
has been added to the -mm mm-unstable branch.  Its filename is
     mm-damon-core-use-nr_accesses_bp-as-a-source-of-damos_before_apply-tracepoint.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-use-nr_accesses_bp-as-a-source-of-damos_before_apply-tracepoint.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/core: use nr_accesses_bp as a source of damos_before_apply tracepoint
Date: Sat, 16 Sep 2023 02:09:39 +0000

damos_before_apply tracepoint is exposing access rate of DAMON regions
using nr_accesses field of regions, which was actually used by DAMOS in
the past.  However, it has changed to use nr_accesses_bp instead.  Update
the tracepoint to expose the value that DAMOS is really using.

Note that it doesn't expose the value as is in the basis point, but after
converting it to the natural number by dividing it by 10,000.  Therefore
this change doesn't make user-visible behavioral differences.

Link: https://lkml.kernel.org/r/20230916020945.47296-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/trace/events/damon.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/trace/events/damon.h~mm-damon-core-use-nr_accesses_bp-as-a-source-of-damos_before_apply-tracepoint
+++ a/include/trace/events/damon.h
@@ -36,7 +36,7 @@ TRACE_EVENT_CONDITION(damos_before_apply
 		__entry->target_idx = target_idx;
 		__entry->start = r->ar.start;
 		__entry->end = r->ar.end;
-		__entry->nr_accesses = r->nr_accesses;
+		__entry->nr_accesses = r->nr_accesses_bp / 10000;
 		__entry->age = r->age;
 		__entry->nr_regions = nr_regions;
 	),
_

Patches currently in -mm which might be from sj@kernel.org are

docs-admin-guide-mm-damon-usage-fixup-missed-ref-keyword.patch
docs-admin-guide-mm-damon-usage-place-debugfs-usage-at-the-bottom.patch
docs-admin-guide-mm-damon-usage-move-debugfs-intro-to-the-bottom-of-the-section.patch
docs-mm-damon-design-explicitly-introduce-nr_accesses.patch
docs-admin-guide-mm-damon-usage-explain-the-format-of-damon_aggregate-tracepoint.patch
docs-mm-damon-design-add-a-section-for-kdamond-and-damon-context.patch
docs-admin-guide-mm-damon-usage-link-design-doc-for-details-of-kdamond-and-context.patch
mm-damon-core-fix-a-comment-about-damon_set_attrs-call-timings.patch
mm-damon-core-add-more-comments-for-nr_accesses.patch
mm-damon-core-remove-duplicated-comment-for-watermarks-based-deactivation.patch
mm-damon-core-remove-struct-target-parameter-from-damon_aggregated-tracepoint.patch
mm-damon-core-add-a-tracepoint-for-damos-apply-target-regions.patch
docs-admin-guide-mm-damon-usage-document-damos_before_apply-tracepoint.patch
mm-damon-core-use-number-of-passed-access-sampling-as-a-timer.patch
mm-damon-core-define-and-use-a-dedicated-function-for-region-access-rate-update.patch
mm-damon-vaddr-call-damon_update_region_access_rate-always.patch
mm-damon-core-implement-a-pseudo-moving-sum-function.patch
mm-damon-core-test-add-a-unit-test-for-damon_moving_sum.patch
mm-damon-core-introduce-nr_accesses_bp.patch
mm-damon-core-use-pseudo-moving-sum-for-nr_accesses_bp.patch
mm-damon-core-skip-updating-nr_accesses_bp-for-each-aggregation-interval.patch
mm-damon-core-mark-damon_moving_sum-as-a-static-function.patch
mm-damon-core-make-damos-uses-nr_accesses_bp-instead-of-nr_accesses.patch
mm-damon-sysfs-schemes-use-nr_accesses_bp-as-the-source-of-tried_regions-n-nr_accesses.patch
mm-damon-core-use-nr_accesses_bp-as-a-source-of-damos_before_apply-tracepoint.patch
mm-damon-core-implement-scheme-specific-apply-interval.patch
docs-mm-damon-design-document-damos-apply-intervals.patch
mm-damon-sysfs-schemes-support-damos-apply-interval.patch
selftests-damon-sysfs-test-damos-apply-intervals.patch
docs-admin-guide-mm-damon-usage-update-for-damos-apply-intervals.patch
docs-abi-damon-update-for-damos-apply-intervals.patch