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From: Roland McGrath <roland@redhat.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Sripathi Kodi <sripathik@in.ibm.com>, Linus Torvalds <torvalds@osdl.org>,
       Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org,
       patrics@interia.pl, Ingo Molnar <mingo@elte.hu>
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>
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
Content-Length: 715
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> 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
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