[PATCH] taskstats_exit_alloc: optimize/simplify

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If there are no listeners, every task does unneeded kmem_cache alloc/free on
exit. We don't need listeners->sem for 'if (!list_empty())' check. Yes, we may
have a false positive, but this doesn't differ from the case when the listener
is unregistered after we drop the semaphore. So we don't need to do allocation
beforehand.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Balbir Singh <balbir@in.ibm.com>
Acked-by: Shailabh Nagar <nagar@watson.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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Oleg Nesterov 2006-12-06 20:36:50 -08:00 • committed by Linus Torvalds

parent 38da288b8b

commit 128fb95650

1 changed files with 4 additions and 13 deletions

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kernel/taskstats.c

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