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authorSuren Baghdasaryan <surenb@google.com>2023-04-28 10:35:33 -0700
committerAndrew Morton <akpm@linux-foundation.org>2023-05-02 17:23:28 -0700
commit6152e53d9671b0ccc21c1bca842617b32ccfc5d8 (patch)
tree9d475de31425be47f4d540217a9aff7056e6a2b4 /mm
parent3628d2bb155b0e4dfc1922a99de0631d3e2095d3 (diff)
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')
-rw-r--r--mm/Kconfig.debug10
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.