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| author | Paul Menage <menage@google.com> | 2009-01-29 14:25:21 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-29 18:04:45 -0800 |
| commit | 804b3c28a4e4fa1c224571bf76edb534b9c4b1ed (patch) | |
| tree | 59e0dabb227a5067cfdc7cce13f149f141ef8cb4 /include | |
| parent | 1404f06565ee89e0ce04d4a5859c00b0e3a0dc8d (diff) | |
| download | linux-rpi-804b3c28a4e4fa1c224571bf76edb534b9c4b1ed.tar.gz linux-rpi-804b3c28a4e4fa1c224571bf76edb534b9c4b1ed.tar.bz2 linux-rpi-804b3c28a4e4fa1c224571bf76edb534b9c4b1ed.zip | |
cgroups: add cpu_relax() calls in css_tryget() and cgroup_clear_css_refs()
css_tryget() and cgroup_clear_css_refs() contain polling loops; these
loops should have cpu_relax calls in them to reduce cross-cache traffic.
Signed-off-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cgroup.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index e267e62827bb..e4e8e117d27d 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -99,6 +99,7 @@ static inline bool css_tryget(struct cgroup_subsys_state *css) while (!atomic_inc_not_zero(&css->refcnt)) { if (test_bit(CSS_REMOVED, &css->flags)) return false; + cpu_relax(); } return true; } |