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[PATCH] do __unhash_process() under ->siglock 

This patch moves __unhash_process() call from realease_task() to
__exit_signal(), so __detach_pid() is called with ->siglock held.

This means we don't need tasklist_lock to iterate over thread group anymore:

	copy_process() was already changed to do attach_pid()
	under ->siglock.

	Eric's "pidhash-kill-switch_exec_pids.patch" from -mm
	changed de_thread() so it doesn't touch PIDTYPE_TGID.

NOTE: de_thread() still needs some attention.  It still changes task->pid
lockless.  Taking ->sighand.siglock here allows to do more tasklist_lock
removals.

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>
This commit is contained in:
Oleg Nesterov 2006-03-28 16:11:20 -08:00 committed by Linus Torvalds
parent 35f5cad8c4
commit 5876700cd3
1 changed files with 2 additions and 2 deletions
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4
kernel/exit.c
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@ -112,6 +112,8 @@ static void __exit_signal(struct task_struct *tsk)
sig = NULL; /* Marker for below. */
}
__unhash_process(tsk);
tsk->signal = NULL;
cleanup_sighand(tsk);
spin_unlock(&sighand->siglock);
@ -140,8 +142,6 @@ repeat:
BUG_ON(!list_empty(&p->ptrace_list) || !list_empty(&p->ptrace_children));
__exit_signal(p);
__unhash_process(p);
/*
* If we are the last non-leader member of the thread
* group, and the leader is zombie, then notify the