From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965203AbVIOH3d (ORCPT ); Thu, 15 Sep 2005 03:29:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965208AbVIOH3d (ORCPT ); Thu, 15 Sep 2005 03:29:33 -0400 Received: from mx1.redhat.com ([66.187.233.31]:34690 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S965203AbVIOH3c (ORCPT ); Thu, 15 Sep 2005 03:29:32 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit From: Roland McGrath To: Al Viro X-Fcc: ~/Mail/linus Cc: Sripathi Kodi , Linus Torvalds , Andrew Morton , linux-kernel@vger.kernel.org, patrics@interia.pl, Ingo Molnar Subject: Re: [PATCH 2.6.13.1] Patch for invisible threads In-Reply-To: Al Viro's message of Thursday, 15 September 2005 03:12:36 +0100 <20050915021236.GA25261@ZenIV.linux.org.uk> X-Shopping-List: (1) Dissident yies (2) Expeditious excitements (3) Seismic loads (4) Simultaneous belligerent battalions (5) Independent omnipresent bruisers Message-Id: <20050915072906.A26D2180A18@magilla.sf.frob.com> Date: Thu, 15 Sep 2005 00:29:06 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > Among other things, it means that zombies keep pinning their root and cwd > down, AFAICS. Not Good(tm). Good point. The technique that looks for the first nonzombie in the group to fetch its fs might be best if it's necessary to use fs for the permission checks. It should always find a winner on just one iteration, or two or three in races, except for ptrace keeping zombie threads alive (otherwise all zombies but the leader self-reap quickly). Thanks, Roland