From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755949Ab1HRMwm (ORCPT ); Thu, 18 Aug 2011 08:52:42 -0400 Received: from tango.0pointer.de ([85.214.72.216]:51385 "EHLO tango.0pointer.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755216Ab1HRMwl (ORCPT ); Thu, 18 Aug 2011 08:52:41 -0400 X-Greylist: delayed 465 seconds by postgrey-1.27 at vger.kernel.org; Thu, 18 Aug 2011 08:52:41 EDT Date: Thu, 18 Aug 2011 14:43:53 +0200 From: Lennart Poettering To: Oleg Nesterov Cc: Kay Sievers , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-man@vger.kernel.org, roland@hack.frob.com, torvalds@linux-foundation.org Subject: Re: + prctl-add-pr_setget_child_reaper-to-allow-simple-process-supervision .patch added to -mm tree Message-ID: <20110818124353.GA2839@tango.0pointer.de> References: <201108162011.p7GKBcY0023134@imap1.linux-foundation.org> <20110817115543.GA8745@redhat.com> <20110817134516.GA14136@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110817134516.GA14136@redhat.com> Organization: Red Hat, Inc. X-Campaign-1: () ASCII Ribbon Campaign X-Campaign-2: / Against HTML Email & vCards - Against Microsoft Attachments User-Agent: Leviathan/19.8.0 [zh] (Cray 3; I; Solaris 4.711; Console) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 17.08.11 15:45, Oleg Nesterov (oleg@redhat.com) wrote: > You should mark the whole process as sub-reaper, not a single thread > which does prctl(). The parent/child relationship is process-wide. Hmm, how would we implement this best? Would it be sufficient to follow group_leader pointer to set/get the flag, and to follow real_parent instead of parent when looking for the reaper task (i.e. the one with the flag set)? Lennart -- Lennart Poettering - Red Hat, Inc.