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authorDennis Zhou <dennisz@fb.com>2017-06-20 02:28:31 +0300
committerTejun Heo <tj@kernel.org>2017-06-20 22:31:38 +0300
commit30a5b5367ef9d5c9055414e12ec2f02d9de2e70f (patch)
tree900c04966e2adae51b7f833dbedcd8cbe0f828bb /mm/Kconfig
parent8fa3ed8014ac792a4c76d585b5c0f68bd202ff6b (diff)
downloadlinux-30a5b5367ef9d5c9055414e12ec2f02d9de2e70f.tar.xz
percpu: expose statistics about percpu memory via debugfs
There is limited visibility into the use of percpu memory leaving us unable to reason about correctness of parameters and overall use of percpu memory. These counters and statistics aim to help understand basic statistics about percpu memory such as number of allocations over the lifetime, allocation sizes, and fragmentation. New Config: PERCPU_STATS Signed-off-by: Dennis Zhou <dennisz@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'mm/Kconfig')
-rw-r--r--mm/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index beb7a455915d..8fae42606d56 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -706,3 +706,11 @@ config ARCH_USES_HIGH_VMA_FLAGS
bool
config ARCH_HAS_PKEYS
bool
+
+config PERCPU_STATS
+ bool "Collect percpu memory statistics"
+ default n
+ help
+ This feature collects and exposes statistics via debugfs. The
+ information includes global and per chunk statistics, which can
+ be used to help understand percpu memory usage.