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| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-01-07 18:08:41 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 08:31:11 -0800 |
| commit | 5a7625df725a486ad600b0036b6111dbd6321c41 (patch) | |
| tree | a1b9c81371a6dffbed4a313ec25df33134925af2 /kernel/cpuset.c | |
| parent | f5813d94279a18ff5936d675e24b44b44a571197 (diff) | |
| download | linux-5a7625df725a486ad600b0036b6111dbd6321c41.tar.gz linux-5a7625df725a486ad600b0036b6111dbd6321c41.tar.bz2 linux-5a7625df725a486ad600b0036b6111dbd6321c41.zip | |
cpuset: remove on stack cpumask_t in cpuset_sprintf_cpulist()
This patchset converts cpuset to use new cpumask API, and thus
remove on stack cpumask_t to reduce stack usage.
Before:
# cat kernel/cpuset.c include/linux/cpuset.h | grep -c cpumask_t
21
After:
# cat kernel/cpuset.c include/linux/cpuset.h | grep -c cpumask_t
0
This patch:
Impact: reduce stack usage
It's safe to call cpulist_scnprintf inside callback_mutex, and thus we can
just remove the cpumask_t and no need to allocate a cpumask_var_t.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Mike Travis <travis@sgi.com>
Cc: 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 'kernel/cpuset.c')
| -rw-r--r-- | kernel/cpuset.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 6012e326e856..41c2343df975 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1486,13 +1486,13 @@ static int cpuset_write_resmask(struct cgroup *cgrp, struct cftype *cft, static int cpuset_sprintf_cpulist(char *page, struct cpuset *cs) { - cpumask_t mask; + int ret; mutex_lock(&callback_mutex); - mask = cs->cpus_allowed; + ret = cpulist_scnprintf(page, PAGE_SIZE, &cs->cpus_allowed); mutex_unlock(&callback_mutex); - return cpulist_scnprintf(page, PAGE_SIZE, &mask); + return ret; } static int cpuset_sprintf_memlist(char *page, struct cpuset *cs) |