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mm: add infrastructure for get_user_pages_fast() benchmarking

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Performance of get_user_pages_fast() is critical for some workloads, but
it's tricky to test it directly.

This patch provides /sys/kernel/debug/gup_benchmark that helps with
testing performance of it.

See tools/testing/selftests/vm/gup_benchmark.c for userspace
counterpart.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thorsten Leemhuis <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Huang Ying <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2017-11-17 15:31:22 -08:00 • committed by Linus Torvalds
commit 64c349f4ae
5 changed files with 202 additions and 0 deletions
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9
mm/Kconfig
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@ -756,3 +756,12 @@ config PERCPU_STATS
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.
config GUP_BENCHMARK
bool "Enable infrastructure for get_user_pages_fast() benchmarking"
default n
help
Provides /sys/kernel/debug/gup_benchmark that helps with testing
performance of get_user_pages_fast().
See tools/testing/selftests/vm/gup_benchmark.c