linux-kernel - Re: [PATCH] worker_thread: don't play with SIGCHLD

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Date:	Fri, 13 Apr 2007 07:21:49 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] worker_thread: don't play with SIGCHLD

Oleg Nesterov <oleg@...sign.ru> writes:

> depends on Eric's
>
> 	kthread-dont-depend-on-work-queues-take-2.patch
>
> worker_thread() inherits ignored SIGCHLD from its parent, kthreadd.
> We can remove unneeded do_sigaction().

Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Looks good.

We could delete all of:

> 	set_user_nice(current, -5);
> 
> 	/* Block and flush all signals */
> 	sigfillset(&blocked);
> 	sigprocmask(SIG_BLOCK, &blocked, NULL);
> 	flush_signals(current);
> 
> 	/*
> 	 * We inherited MPOL_INTERLEAVE from the booting kernel.
> 	 * Set MPOL_DEFAULT to insure node local allocations.
> 	 */
> 	numa_default_policy();
> 
> 	/* SIG_IGN makes children autoreap: see do_notify_parent(). */
> 	sa.sa.sa_handler = SIG_IGN;
> 	sa.sa.sa_flags = 0;
> 	siginitset(&sa.sa.sa_mask, sigmask(SIGCHLD));
> 	do_sigaction(SIGCHLD, &sa, (struct k_sigaction *)0);

If we wanted to, as that all comes by default from kthreadd.

Eric
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