signals: microoptimize the usage of ->curr_target
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>
diff --git a/kernel/fork.c b/kernel/fork.c
index 068ffe0..2bb675a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -892,7 +892,7 @@
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);
diff --git a/kernel/signal.c b/kernel/signal.c
index 17859f0..0298bd3 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -863,10 +863,6 @@
* 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)
