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This tool induces memory fragmentation via sequential allocation of
transparent huge pages and splitting off everything except their last
sub-pages. It easily generates pressure to the memory compaction code.
$ perf stat -e 'compaction:*' -e 'migrate:*' ./transhuge-stress
transhuge-stress: allocate 7858 transhuge pages, using 15716 MiB virtual memory and 61 MiB of ram
transhuge-stress: 1.653 s/loop, 0.210 ms/page, 9504.828 MiB/s 7858 succeed, 0 failed, 2439 different pages
transhuge-stress: 1.537 s/loop, 0.196 ms/page, 10226.227 MiB/s 7858 succeed, 0 failed, 2364 different pages
transhuge-stress: 1.658 s/loop, 0.211 ms/page, 9479.215 MiB/s 7858 succeed, 0 failed, 2179 different pages
transhuge-stress: 1.617 s/loop, 0.206 ms/page, 9716.992 MiB/s 7858 succeed, 0 failed, 2421 different pages
^C./transhuge-stress: Interrupt
Performance counter stats for './transhuge-stress':
1.744.051 compaction:mm_compaction_isolate_migratepages
1.014 compaction:mm_compaction_isolate_freepages
1.744.051 compaction:mm_compaction_migratepages
1.647 compaction:mm_compaction_begin
1.647 compaction:mm_compaction_end
1.744.051 migrate:mm_migrate_pages
0 migrate:mm_numa_migrate_ratelimit
7,964696835 seconds time elapsed
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Konstantin Khlebnikov