diff options
| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-03-28 16:11:21 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-28 18:36:43 -0800 |
| commit | 7d7185c818925ba5fe90efa75840d0b415032774 (patch) | |
| tree | d0ae8f18c7ec272d887d5bcb822773d9048e8507 /kernel | |
| parent | 5876700cd399112ecfa70df36203c8c6660d84f8 (diff) | |
| download | linux-7d7185c818925ba5fe90efa75840d0b415032774.tar.bz2 | |
[PATCH] sys_times: don't take tasklist_lock
sys_times: don't take tasklist_lock
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sys.c | 13 |
1 files changed, 1 insertions, 12 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 84371fdc660b..7ef7f6054c28 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1206,7 +1206,7 @@ asmlinkage long sys_times(struct tms __user * tbuf) struct task_struct *t; cputime_t utime, stime, cutime, cstime; - read_lock(&tasklist_lock); + spin_lock_irq(&tsk->sighand->siglock); utime = tsk->signal->utime; stime = tsk->signal->stime; t = tsk; @@ -1216,20 +1216,9 @@ asmlinkage long sys_times(struct tms __user * tbuf) t = next_thread(t); } while (t != tsk); - /* - * While we have tasklist_lock read-locked, no dying thread - * can be updating current->signal->[us]time. Instead, - * we got their counts included in the live thread loop. - * However, another thread can come in right now and - * do a wait call that updates current->signal->c[us]time. - * To make sure we always see that pair updated atomically, - * we take the siglock around fetching them. - */ - spin_lock_irq(&tsk->sighand->siglock); cutime = tsk->signal->cutime; cstime = tsk->signal->cstime; spin_unlock_irq(&tsk->sighand->siglock); - read_unlock(&tasklist_lock); tmp.tms_utime = cputime_to_clock_t(utime); tmp.tms_stime = cputime_to_clock_t(stime); |