]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
selftests: vm: add KSM merging time test
authorZhansaya Bagdauletkyzy <zhansayabagdaulet@gmail.com>
Thu, 2 Sep 2021 22:00:54 +0000 (15:00 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 3 Sep 2021 16:58:18 +0000 (09:58 -0700)
commit9e7cb94ca218816bfd51e07b50bcfeadd3166d42
treeb6b32c9d6de19d7f3fff218aa6834dad47cfbbd1
parent584ff0dfb09a81e1addf02543f7c1fa8e71ce6d2
selftests: vm: add KSM merging time test

Patch series "add KSM performance tests", v3.

Extend KSM self tests with a performance benchmark.  These tests are not
part of regular regression testing, as they are mainly intended to be used
by developers making changes to the memory management subsystem.

This patch (of 2):

Add ksm_merge_time() function to determine speed and time needed for
merging.  The total spent time is shown in seconds while speed is in
MiB/s.  User must specify the size of duplicated memory area (in MiB)
before running the test.

The test is run as follows: ./ksm_tests -P -s 100
The output:
Total size:    100 MiB
Total time:    0.201106786 s
Average speed:  497.248 MiB/s

Link: https://lkml.kernel.org/r/cover.1629386192.git.zhansayabagdaulet@gmail.com
Link: https://lkml.kernel.org/r/318b946ac80cc9205c89d0962048378f7ce0705b.1629386192.git.zhansayabagdaulet@gmail.com
Signed-off-by: Zhansaya Bagdauletkyzy <zhansayabagdaulet@gmail.com>
Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
tools/testing/selftests/vm/ksm_tests.c