linux-kernel - Re: [path][rfc] add PR_DETACH prctl command [1/2]

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Message-ID: <4DAEDBB5.8090006@aknet.ru>
Date:	Wed, 20 Apr 2011 17:12:21 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Oleg Nesterov <oleg@...hat.com>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [path][rfc] add PR_DETACH prctl command [1/2]

Hi Alan, Oleg.

I changed the patch the way you asked.
It now consumes much fewer per-thread bytes
(2 bytes + padding), and does much fewer suspicious
things on the hot path. And no zombies with ppid=1.

The attached patch adds do_signal_parent() function.
It is the same as do_notify_parent(), but can be used
when the child is not terminating, but (for example)
detaches with PR_DETACH.

View attachment "01_sigpar.diff" of type "text/plain" (3689 bytes)