Commit 6152e53d authored by Suren Baghdasaryan's avatar Suren Baghdasaryan Committed by Andrew Morton
Browse files

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: 52f23865 ("mm: introduce per-VMA lock statistics")
Signed-off-by: default avatarSuren Baghdasaryan <surenb@google.com>
Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: default avatarLorenzo Stoakes <lstoakes@gmail.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 3628d2bb

mm/Kconfig.debug

+8 −2
Original line number Diff line number Diff line
@@ -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.