Commit 17b02695 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds

[PATCH] taskstats_tgid_alloc: optimization

Every subthread (except first) does unneeded kmem_cache_alloc/kmem_cache_free.
Signed-off-by: default avatarOleg Nesterov <oleg@tv-sign.ru>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 093a8e8a
...@@ -32,6 +32,9 @@ static inline void taskstats_tgid_alloc(struct signal_struct *sig) ...@@ -32,6 +32,9 @@ static inline void taskstats_tgid_alloc(struct signal_struct *sig)
struct taskstats *stats; struct taskstats *stats;
unsigned long flags; unsigned long flags;
if (sig->stats != NULL)
return;
stats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL); stats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
if (!stats) if (!stats)
return; return;
......
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