From: Andrew Morton <akpm@zip.com.au>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Helge Hafting <helgehaf@aitel.hist.no>,
"Albert D. Cahalan" <acahalan@cs.uml.edu>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Linux-2.5 fix/improve get_pid()
Date: Fri, 09 Aug 2002 02:35:50 -0700 [thread overview]
Message-ID: <3D538CF6.FBDFBE47@zip.com.au> (raw)
In-Reply-To: 1028889153.28883.186.camel@irongate.swansea.linux.org.uk
Alan Cox wrote:
>
> On Fri, 2002-08-09 at 09:48, Helge Hafting wrote:
> > Use 32-bit PID's, but with an additional rule for wraparound.
> > Simply wrap the PID when
> > (nextPID > 2*number_of_processes && nextPID > 30000)
> > The latter one just to avoid wrapping at 10 when there are
> > 5 processes.
>
> Its much simpler to put max_pid into /proc/sys/kernel. That way we can
> boot with 32000 process ids, which will ensure ancient stuff which has
> 16bit pid_t (old old libc) and also any old kernel interfaces which
> expose it - does ipc ?
procfs oopses with >65535 processes, btw. Related to the i_ino
encoding:
#define fake_ino(pid,ino) (((pid)<<16)|(ino))
#define PROC_INODE_PROPER(inode) ((inode)->i_ino & ~0xffff)
it ruined Anton's evening ;)
next prev parent reply other threads:[~2002-08-09 9:22 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-08 21:43 [PATCH] Linux-2.5 fix/improve get_pid() Hubertus Franke
2002-08-08 22:02 ` Linus Torvalds
2002-08-08 22:26 ` Linus Torvalds
2002-08-08 23:09 ` Albert D. Cahalan
2002-08-09 3:26 ` Chris Adams
2002-08-09 7:04 ` Albert D. Cahalan
2002-08-09 8:48 ` Helge Hafting
2002-08-09 10:32 ` Alan Cox
2002-08-09 9:35 ` Andrew Morton [this message]
2002-08-09 10:37 ` Andries Brouwer
2002-08-09 13:00 ` Chris Adams
2002-08-09 14:39 ` Albert D. Cahalan
2002-08-09 13:59 ` Rik van Riel
2002-08-09 14:57 ` Albert D. Cahalan
2002-08-08 22:34 ` Paul Larson
2002-08-08 22:44 ` Rik van Riel
2002-08-08 22:37 ` Rik van Riel
2002-08-09 1:49 ` Andries Brouwer
2002-08-09 19:34 ` Paul Larson
2002-08-09 20:13 ` Paul Larson
2002-08-09 20:40 ` Andries Brouwer
2002-08-09 21:23 ` Linus Torvalds
2002-08-09 21:42 ` Linus Torvalds
2002-08-09 21:46 ` Paul Larson
2002-08-09 22:04 ` Linus Torvalds
2002-08-10 17:23 ` Jamie Lokier
2002-08-10 18:33 ` Linus Torvalds
2002-08-10 18:48 ` Jamie Lokier
2002-08-11 20:41 ` Alan Cox
2002-08-11 19:58 ` Jamie Lokier
2002-08-11 21:23 ` Alan Cox
2002-08-11 20:10 ` Jamie Lokier
2002-08-12 8:56 ` Padraig Brady
2002-08-12 10:37 ` Alan Cox
2002-08-12 9:21 ` Padraig Brady
2002-08-12 14:40 ` Paul Larson
-- strict thread matches above, loose matches on Subject: below --
2002-08-12 16:15 Jim Houston
2002-08-09 0:53 Hubertus Franke
2002-08-08 21:50 Hubertus Franke
2002-08-08 18:56 Hubertus Franke
2002-08-08 19:15 ` Rik van Riel
2002-08-08 19:18 ` Paul Larson
2002-08-07 22:03 Paul Larson
2002-08-07 23:06 ` Andrew Morton
2002-08-08 0:24 ` Andries Brouwer
2002-08-08 19:42 ` William Lee Irwin III
2002-08-08 20:47 ` Andries Brouwer
2002-08-08 20:24 ` Linus Torvalds
2002-08-08 21:30 ` H. Peter Anvin
2002-08-08 21:45 ` William Lee Irwin III
2002-08-09 4:42 ` William Lee Irwin III
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