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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-04-30 00:52:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:35 -0700 |
| commit | db51aeccd7097ce19a522a4c5ff91c320f870e2b (patch) | |
| tree | 373bdfb55d1d90c04d53d4a419bcd156fe7f054c | |
| parent | 08d2c30ce98d274137f12b0a9b9c74137455922c (diff) | |
| download | op-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.c | 2 | ||||
| -rw-r--r-- | kernel/signal.c | 4 |
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) |
