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authorOleg Nesterov <oleg@tv-sign.ru>2008-04-30 00:52:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 08:29:35 -0700
commitdb51aeccd7097ce19a522a4c5ff91c320f870e2b (patch)
tree373bdfb55d1d90c04d53d4a419bcd156fe7f054c
parent08d2c30ce98d274137f12b0a9b9c74137455922c (diff)
downloadop-kernel-dev-db51aeccd7097ce19a522a4c5ff91c320f870e2b.zip
op-kernel-dev-db51aeccd7097ce19a522a4c5ff91c320f870e2b.tar.gz
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>
-rw-r--r--kernel/fork.c2
-rw-r--r--kernel/signal.c4
2 files changed, 1 insertions, 5 deletions
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 @@ 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);
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 @@ __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)
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