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perf cgroup: Clean up perf_cgroup_create()

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- Use kzalloc() to replace kmalloc() + memset().

- Remove redundant initialization, since alloc_percpu() returns
  zero-filled percpu memory.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4D6F347E.2010806@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2011-03-03 14:26:06 +08:00 • committed by Ingo Molnar
parent f75e18cb96
commit 1b15d0558e
1 changed files with 1 additions and 10 deletions
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11
kernel/perf_event.c
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@ -7346,26 +7346,17 @@ static struct cgroup_subsys_state *perf_cgroup_create(
struct cgroup_subsys *ss, struct cgroup *cont) struct cgroup_subsys *ss, struct cgroup *cont)
{ {
struct perf_cgroup *jc; struct perf_cgroup *jc;
struct perf_cgroup_info *t;
int c;
jc = kmalloc(sizeof(*jc), GFP_KERNEL); jc = kzalloc(sizeof(*jc), GFP_KERNEL);
if (!jc) if (!jc)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
memset(jc, 0, sizeof(*jc));
jc->info = alloc_percpu(struct perf_cgroup_info); jc->info = alloc_percpu(struct perf_cgroup_info);
if (!jc->info) { if (!jc->info) {
kfree(jc); kfree(jc);
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
} }
for_each_possible_cpu(c) {
t = per_cpu_ptr(jc->info, c);
t->time = 0;
t->timestamp = 0;
}
return &jc->css; return &jc->css;
} }