linux-toradex.git/tools/testing/selftests/vm/ksm_tests.c, branch master

selftests/vm: rename selftests/vm to selftests/mm

2023-01-19T01:12:56+00:00

Rename selftets/vm to selftests/mm for being more consistent with the
code, documentation, and tools directories, and won't be confused with
virtual machines.

[sj@kernel.org: convert missing vm->mm changes]
  Link: https://lkml.kernel.org/r/20230107230643.252273-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20230103180754.129637-5-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Jonathan Corbet 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton

selftests/vm: add test to measure MADV_UNMERGEABLE performance

2022-12-12T02:12:08+00:00

Let's add a test to measure performance of KSM breaking not triggered via
COW, but triggered by disabling KSM on an area filled with KSM pages via
MADV_UNMERGEABLE.

Link: https://lkml.kernel.org/r/20221021101141.84170-2-david@redhat.com
Signed-off-by: David Hildenbrand 
Acked-by: Peter Xu 
Cc: Andrea Arcangeli 
Cc: Hugh Dickins 
Cc: Jason Gunthorpe 
Cc: John Hubbard 
Cc: Matthew Wilcox (Oracle) 
Cc: Shuah Khan 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton

selftests/vm: use top_srcdir instead of recomputing relative paths

2022-10-05T17:05:17+00:00

In various places both in t/t/s/v/Makefile as well as some of the test
sources, we were referring to headers or directories using some fairly
long relative paths.

Since we have a working top_srcdir variable though, which refers to the
root of the kernel tree, we can clean up all of these "up and over"
relative paths, just relying on the single variable instead.

Signed-off-by: Axel Rasmussen 
Signed-off-by: Shuah Khan

selftests: vm: Fix resource leak when return error

2022-06-16T20:14:08+00:00

When return on an error path, file handle need to be closed
to prevent resource leak

Signed-off-by: Ding Xiang 
Reviewed-by: Shuah Khan 
Signed-off-by: Shuah Khan

selftests: vm: check numa_available() before operating "merge_across_nodes" in ksm_tests

2022-05-25T17:47:49+00:00

Patch series "selftests: vm: a few fixup patches".

This series contains three fixup patches for vm selftests.  They are
independent.  Please see the patches.


This patch (of 3):

Currently, ksm_tests operates "merge_across_nodes" with NUMA either
enabled or disabled.  In a system with NUMA disabled, these operations
will fail and output a misleading report given "merge_across_nodes" does
not exist in sysfs:

  ----------------------------
  running ./ksm_tests -M -p 10
  ----------------------------
  f /sys/kernel/mm/ksm/merge_across_nodes
  fopen: No such file or directory
  Cannot save default tunables
  [FAIL]
  ----------------------

So check numa_available() before those operations to skip them if NUMA is
disabled.

Link: https://lkml.kernel.org/r/20220521083825.319654-1-patrick.wang.shcn@gmail.com
Link: https://lkml.kernel.org/r/20220521083825.319654-2-patrick.wang.shcn@gmail.com
Signed-off-by: Patrick Wang 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton

selftest/vm: add util.h and and move helper functions there

2022-03-25T02:06:45+00:00

Avoid code duplication by adding util.h.  No functional change in this
patch.

Link: https://lkml.kernel.org/r/20220307054355.149820-1-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V 
Cc: Shuah Khan 
Cc: Mike Rapoport 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

selftests: vm: add KSM huge pages merging time test

2021-11-06T20:30:41+00:00

Add test case of KSM merging time using mostly huge pages

Link: https://lkml.kernel.org/r/20211013044045.360251-1-pedrodemargomes@gmail.com
Signed-off-by: Pedro Demarchi Gomes 
Cc: Zhansaya Bagdauletkyzy 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

selftest/vm: fix ksm selftest to run with different NUMA topologies

2021-11-06T20:30:41+00:00

Platforms can have non-contiguous NUMA nodes like below

   #numactl  -H
  available: 2 nodes (0,8)
  .....
  node distances:
  node   0   8
    0:  10  40
    8:  40  10

   #numactl  -H
  available: 1 nodes (1)
  ....
  node distances:
  node   1
    1:  10

Hence update the test to not assume the presence of Node 0 and 1 and
also use numa_num_configured_nodes() instead of numa_max_node for
finding whether to skip the test.

Link: https://lkml.kernel.org/r/20210914141414.350759-1-aneesh.kumar@linux.ibm.com
Fixes: 82e717ad3501 ("selftests: vm: add KSM merging across nodes test")
Signed-off-by: Aneesh Kumar K.V 
Reviewed-by: Pasha Tatashin 
Cc: Zhansaya Bagdauletkyzy 
Cc: Pavel Tatashin 
Cc: Tyler Hicks 
Cc: Hugh Dickins 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

selftests: vm: add COW time test for KSM pages

2021-09-03T16:58:18+00:00

Since merged pages are copied every time they need to be modified, the
write access time is different between shared and non-shared pages.  Add
ksm_cow_time() function which evaluates latency of these COW breaks.
First, 4000 pages are allocated and the time, required to modify 1 byte in
every other page, is measured.  After this, the pages are merged into 2000
pairs and in each pair, 1 page is modified (i.e.  they are decoupled) to
detect COW breaks.  The time needed to break COW of merged pages is then
compared with performance of non-shared pages.

The test is run as follows: ./ksm_tests -C
The output:
	Total size:    15 MiB

	Not merged pages:
	Total time:     0.002185489 s
	Average speed:  3202.945 MiB/s

	Merged pages:
	Total time:     0.004386872 s
	Average speed:  1595.670 MiB/s

Link: https://lkml.kernel.org/r/1d03ee0d1b341959d4b61672c6401d498bff5652.1629386192.git.zhansayabagdaulet@gmail.com
Signed-off-by: Zhansaya Bagdauletkyzy 
Reviewed-by: Tyler Hicks 
Reviewed-by: Pavel Tatashin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

selftests: vm: add KSM merging time test

2021-09-03T16:58:18+00:00

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 
Reviewed-by: Tyler Hicks 
Reviewed-by: Pavel Tatashin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds