From: Andi Kleen <ak@suse.de>
To: Dave McCracken <dmccr@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, torvalds@transmeta.com
Subject: Re: [RFC] POSIX personality
Date: 21 May 2002 23:35:09 +0200 [thread overview]
Message-ID: <p73d6vpxjzm.fsf@oldwotan.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.33.0205211349100.3073-100000@penguin.transmeta.com.suse.lists.linux.kernel> <72190000.1022014608@baldur.austin.ibm.com.suse.lists.linux.kernel>
Dave McCracken <dmccr@us.ibm.com> writes:
> --On Tuesday, May 21, 2002 01:52:37 PM -0700 Linus Torvalds
> <torvalds@transmeta.com> wrote:
>
> > I don't see any reason to start using some fixed-mode semantics without
> > seeing some stronger arguments on exactly why that would be a good idea.
> > We have used up 11 of 24 bits (and more can be made available) over the
> > last five years, and there are no obvious inefficiencies that I can see.
>
> Ok, sounds reasonable. I'll add the bits as I go, then.
One reason for it would be that it would be more efficient. All the various
shared state needed for POSIX thread group emulation could be put into a
single structure with a single reference count.
With clone flags you need one pointer in task_struct per flag and
handling of the reference count for each data structure and allocation/freeing
from various slabs for a real fork.
(basically lots of atomic operations at fork time + bloating of task_struct)
-Andi
next parent reply other threads:[~2002-05-21 21:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.33.0205211349100.3073-100000@penguin.transmeta.com.suse.lists.linux.kernel>
[not found] ` <72190000.1022014608@baldur.austin.ibm.com.suse.lists.linux.kernel>
2002-05-21 21:35 ` Andi Kleen [this message]
2002-05-21 23:08 ` [RFC] POSIX personality Linus Torvalds
2002-05-22 14:19 ` Dave McCracken
2002-05-28 17:26 ` Michael Sinz
2002-05-28 17:31 ` Dave McCracken
[not found] <187597808@toto.iv>
2002-05-21 23:55 ` Peter Chubb
2002-05-21 20:27 Dave McCracken
2002-05-21 20:52 ` Linus Torvalds
2002-05-21 20:56 ` Dave McCracken
2002-05-23 14:10 ` Bill Davidsen
2002-05-23 17:09 ` Linus Torvalds
2002-05-25 0:02 ` jw schultz
2002-05-25 0:38 ` Alan Cox
2002-06-05 13:26 ` Bill Davidsen
2002-05-21 21:13 ` george anzinger
2002-05-21 21:21 ` Dave McCracken
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