From: Oleg Nesterov With this patch a thread group is killed atomically under ->siglock. This is faster because we can use sigaddset() instead of force_sig_info() and this is used in further patches. Signed-off-by: Oleg Nesterov Cc: "Eric W. Biederman" Acked-by: Roland McGrath Signed-off-by: Andrew Morton --- fs/exec.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff -puN fs/exec.c~coredump-speedup-sigkill-sending fs/exec.c --- devel/fs/exec.c~coredump-speedup-sigkill-sending 2006-05-19 16:01:37.000000000 -0700 +++ devel-akpm/fs/exec.c 2006-05-19 16:01:37.000000000 -0700 @@ -1371,17 +1371,24 @@ static void format_corename(char *corena static void zap_process(struct task_struct *start, int *ptraced) { struct task_struct *t; + unsigned long flags; + + spin_lock_irqsave(&start->sighand->siglock, flags); t = start; do { if (t != current && t->mm) { t->mm->core_waiters++; - force_sig_specific(SIGKILL, t); + sigaddset(&t->pending.signal, SIGKILL); + signal_wake_up(t, 1); + if (unlikely(t->ptrace) && unlikely(t->parent->mm == t->mm)) *ptraced = 1; } } while ((t = next_thread(t)) != start); + + spin_unlock_irqrestore(&start->sighand->siglock, flags); } static void zap_threads (struct mm_struct *mm) _