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| author | Suren Baghdasaryan <surenb@google.com> | 2023-04-28 10:35:33 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-05-02 17:23:28 -0700 |
| commit | 6152e53d9671b0ccc21c1bca842617b32ccfc5d8 (patch) | |
| tree | 9d475de31425be47f4d540217a9aff7056e6a2b4 /mm/Kconfig.debug | |
| parent | 3628d2bb155b0e4dfc1922a99de0631d3e2095d3 (diff) | |
| download | linux-stable-6152e53d9671b0ccc21c1bca842617b32ccfc5d8.tar.gz linux-stable-6152e53d9671b0ccc21c1bca842617b32ccfc5d8.tar.bz2 linux-stable-6152e53d9671b0ccc21c1bca842617b32ccfc5d8.zip | |
mm: change per-VMA lock statistics to be disabled by default
Change CONFIG_PER_VMA_LOCK_STATS to be disabled by default, as most users
don't need it. Add configuration help to clarify its usage.
Link: https://lkml.kernel.org/r/20230428173533.18158-1-surenb@google.com
Fixes: 52f238653e45 ("mm: introduce per-VMA lock statistics")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig.debug')
| -rw-r--r-- | mm/Kconfig.debug | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug index 6dae63b46368..a925415b4d10 100644 --- a/mm/Kconfig.debug +++ b/mm/Kconfig.debug @@ -274,6 +274,12 @@ config DEBUG_KMEMLEAK_AUTO_SCAN config PER_VMA_LOCK_STATS bool "Statistics for per-vma locks" depends on PER_VMA_LOCK - default y help - Statistics for per-vma locks. + Say Y here to enable success, retry and failure counters of page + faults handled under protection of per-vma locks. When enabled, the + counters are exposed in /proc/vmstat. This information is useful for + kernel developers to evaluate effectiveness of per-vma locks and to + identify pathological cases. Counting these events introduces a small + overhead in the page fault path. + + If in doubt, say N. |