diff options
| author |   John Hubbard <jhubbard@nvidia.com> | 2020-10-13 16:57:04 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-13 18:38:34 -0700 |
| commit | 1100262037be8008cc85240389fbe5eac4df034d (patch) | |
| tree | 02931b054859673f933fb7b98db8b71d3b9bd98e /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | include/linux/compaction.h: clean code by removing unused enum value (diff) | |
| download | wireguard-linux-1100262037be8008cc85240389fbe5eac4df034d.tar.xz wireguard-linux-1100262037be8008cc85240389fbe5eac4df034d.zip | |
selftests/vm: 8x compaction_test speedup
This patch reduces the running time for compaction_test from about 27 sec,
to 3.3 sec, which is about an 8x speedup.
These numbers are for an Intel x86_64 system with 32 GB of DRAM.
The compaction_test.c program was spending most of its time doing mmap(),
1 MB at a time, on about 25 GB of memory.
Instead, do the mmaps 100 MB at a time. (Going past 100 MB doesn't make
things go much faster, because other parts of the program are using the
remaining time.)
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Sri Jayaramappa <sjayaram@akamai.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Link: https://lkml.kernel.org/r/20201002080621.551044-2-jhubbard@nvidia.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions