Messages in this thread Patch in this message | | | Date | Wed, 23 Apr 2008 11:04:36 +0800 | From | Li Zefan <> | Subject | [PATCH] cgroup: use read lock to guard find_existing_css_set() |
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The function does not modify anything (except the temporary css template), so it's sufficient to hold read lock.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> --- kernel/cgroup.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 2727f92..e9eb5da 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -406,11 +406,11 @@ static struct css_set *find_css_set( /* First see if we already have a cgroup group that matches * the desired set */ - write_lock(&css_set_lock); + read_lock(&css_set_lock); res = find_existing_css_set(oldcg, cgrp, template); if (res) get_css_set(res); - write_unlock(&css_set_lock); + read_unlock(&css_set_lock); if (res) return res; -- 1.5.4.rc3
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