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signals: microoptimize the usage of ->curr_target

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Suggested by Roland McGrath.

Initialize signal->curr_target in copy_signal().  This way ->curr_target is
never == NULL, we can kill the check in __group_complete_signal's hot path.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-04-30 00:52:52 -07:00 committed by Linus Torvalds
parent 08d2c30ce9
commit db51aeccd7
2 changed files with 1 additions and 5 deletions
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2
kernel/fork.c
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@ -892,7 +892,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
sig->group_exit_code = 0;
sig->group_exit_task = NULL;
sig->group_stop_count = 0;
sig->curr_target = NULL;
sig->curr_target = tsk;
init_sigpending(&sig->shared_pending);
INIT_LIST_HEAD(&sig->posix_timers);

4
kernel/signal.c
View file

@ -863,10 +863,6 @@ __group_complete_signal(int sig, struct task_struct *p)
* Otherwise try to find a suitable thread.
*/
t = signal->curr_target;
if (t == NULL)
/* restart balancing at this thread */
t = signal->curr_target = p;
while (!wants_signal(sig, t)) {
t = next_thread(t);
if (t == signal->curr_target)