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Commit 281de339 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
Browse files

[PATCH] coredump: speedup SIGKILL sending 



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: default avatarOleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent aceecc04

fs/exec.c

+8 −1
Original line number Diff line number Diff line
@@ -1371,17 +1371,24 @@ static void format_corename(char *corename, const char *pattern, long signr) 
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)