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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 18:59:41 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 18:59:41 +0300
commita4c20b9a574b9720acf6c647eaff5e7e1e688086 (patch)
treed25c1d51c6f55de593028fde1276ea9976214014 /mm/Kconfig
parent9b51f04424e17051a89ab32d892ca66b2a104825 (diff)
parente3efe3db932b55ed34ba32862f568abae32046d0 (diff)
downloadlinux-a4c20b9a574b9720acf6c647eaff5e7e1e688086.tar.xz
Merge branch 'for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
Pull percpu updates from Tejun Heo: "These are the percpu changes for the v4.13-rc1 merge window. There are a couple visibility related changes - tracepoints and allocator stats through debugfs, along with __ro_after_init markings and a cosmetic rename in percpu_counter. Please note that the simple O(#elements_in_the_chunk) area allocator used by percpu allocator is again showing scalability issues, primarily with bpf allocating and freeing large number of counters. Dennis is working on the replacement allocator and the percpu allocator will be seeing increased churns in the coming cycles" * 'for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu: fix static checker warnings in pcpu_destroy_chunk percpu: fix early calls for spinlock in pcpu_stats percpu: resolve err may not be initialized in pcpu_alloc percpu_counter: Rename __percpu_counter_add to percpu_counter_add_batch percpu: add tracepoint support for percpu memory percpu: expose statistics about percpu memory via debugfs percpu: migrate percpu data structures to internal header percpu: add missing lockdep_assert_held to func pcpu_free_area mark most percpu globals as __ro_after_init
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 398b46064544..665cb370ad38 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.