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| author | Marcin Slusarz <marcin.slusarz@gmail.com> | 2011-06-26 23:39:18 +0400 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2011-07-07 23:44:45 +0400 |
| commit | c4089f98e943ff445665dea49c190657b34ccffe (patch) | |
| tree | 8238e65e7eaf575afc52c44179f428c3069584cd /mm/mprotect.c | |
| parent | d18a90dd85f8243ed20cdadb6d8a37d595df456d (diff) | |
| download | linux-c4089f98e943ff445665dea49c190657b34ccffe.tar.xz | |
slub: reduce overhead of slub_debug
slub checks for poison one byte by one, which is highly inefficient
and shows up frequently as a highest cpu-eater in perf top.
Joining reads gives nice speedup:
(Compiling some project with different options)
make -j12 make clean
slub_debug disabled: 1m 27s 1.2 s
slub_debug enabled: 1m 46s 7.6 s
slub_debug enabled + this patch: 1m 33s 3.2 s
check_bytes still shows up high, but not always at the top.
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: linux-mm@kvack.org
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/mprotect.c')
0 files changed, 0 insertions, 0 deletions