From: Andi Kleen <andi@firstfloor.org>
To: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Eric Sandeen <sandeen@sandeen.net>, Adrian Bunk <bunk@kernel.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Shawn Bohrer <shawn.bohrer@gmail.com>,
Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Arjan van de Ven <arjan@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: x86: 4kstacks default
Date: Mon, 21 Apr 2008 11:55:13 +0200 [thread overview]
Message-ID: <8763ub8rcu.fsf@basil.nowhere.org> (raw)
In-Reply-To: <200804210945.24479.vda.linux@googlemail.com> (Denys Vlasenko's message of "Mon, 21 Apr 2008 09:45:24 +0200")
Denys Vlasenko <vda.linux@googlemail.com> writes:
>
> Forget about 50k threads. 4k of waste per process is a waste nevertheless.
> It's not at all unusual to have 250+ processes, and 250 processes with 8k
> stack each waste 1M. Do you think extra 1M won't be useful to have?
If the 1M gives you more reliability (and I think it does) I don't
think it is "wasted". Would you trade occasional crashes for 1MB?
I wouldn't.
Also a typical process uses much more memory than just 4K. If it's
not a thread it needs own page tables and from those alone you're
easily into 10+ pages even for a quite small process. But even threads
in practice have other overheads too if they actually do something.
The 4K won't save or break you.
[BTW if you're really interested in saving memory there are lots
of other subsystems where you could very likely save more. A common
example are the standard hash tables which are still too big]
The trends are also against it: kernel code is getting more and more
complex all the time with more and more complicated stacks of
different subsystems on top of each other. It wouldn't surprise me if
at some point 8KB isn't even enough anymore. Going into the
other direction is definitely the wrong way.
-Andi
next prev parent reply other threads:[~2008-04-21 9:55 UTC|newest]
Thread overview: 162+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200804181737.m3IHbabI010051@hera.kernel.org>
2008-04-18 21:29 ` x86: 4kstacks default Andrew Morton
2008-04-19 14:23 ` Ingo Molnar
2008-04-19 14:35 ` Oliver Pinter
2008-04-19 15:19 ` Adrian Bunk
2008-04-19 15:42 ` Oliver Pinter
2008-04-20 1:56 ` Eric Sandeen
2008-04-20 7:42 ` Adrian Bunk
2008-04-20 16:59 ` Chris Wedgwood
[not found] ` <480AA2B9.10305__23983.3358479247$1208657639$gmane$org@sandeen.net>
2008-04-20 11:48 ` Andi Kleen
2008-04-19 14:59 ` Shawn Bohrer
2008-04-19 18:00 ` Arjan van de Ven
2008-04-19 18:33 ` Ingo Molnar
2008-04-19 19:10 ` Stefan Richter
2008-04-20 2:36 ` Eric Sandeen
2008-04-20 6:11 ` Arjan van de Ven
2008-04-20 22:53 ` David Chinner
2008-04-20 8:09 ` Adrian Bunk
2008-04-20 8:06 ` Alan Cox
2008-04-20 8:51 ` Adrian Bunk
2008-04-20 9:36 ` Alan Cox
2008-04-20 10:44 ` Adrian Bunk
2008-04-20 11:02 ` Alan Cox
2008-04-20 11:54 ` Adrian Bunk
2008-04-20 11:37 ` Alan Cox
2008-04-20 12:18 ` Adrian Bunk
2008-04-20 14:05 ` Eric Sandeen
2008-04-20 14:21 ` Adrian Bunk
2008-04-20 14:56 ` Eric Sandeen
2008-04-20 15:41 ` Arjan van de Ven
2008-04-20 16:03 ` Adrian Bunk
2008-04-21 3:30 ` Alexander E. Patrakov
2008-04-23 8:57 ` Helge Hafting
2008-04-21 7:45 ` Denys Vlasenko
2008-04-21 9:55 ` Andi Kleen [this message]
2008-04-21 13:29 ` Eric Sandeen
2008-04-21 19:51 ` Denys Vlasenko
2008-04-21 20:28 ` Denys Vlasenko
2008-04-22 1:28 ` David Chinner
2008-04-22 2:33 ` [PATCH] xfs: do not pass size into kmem_free, it's unused Denys Vlasenko
2008-04-22 3:03 ` [PATCH] xfs: do not pass unused params to xfs_flush_pages Denys Vlasenko
2008-04-22 3:14 ` [PATCH] xfs: use smaller int param in call " Denys Vlasenko
2008-04-22 3:18 ` Eric Sandeen
2008-04-22 4:10 ` David Chinner
2008-04-22 9:42 ` [PATCH] xfs: remove unused parameter of xfs_qm_dqpurge Denys Vlasenko
2008-04-22 10:16 ` [PATCH] xfs: remove unused parameter of xfs_iomap_write_allocate Denys Vlasenko
2008-04-22 11:20 ` [PATCH] xfs: #define out unused parameters of xfs_bmap_add_free and xfs_btree_read_bufl Denys Vlasenko
2008-04-22 11:48 ` [PATCH] xfs: #define out unused parameters for seven functions in xfs_trans.h Denys Vlasenko
2008-04-22 11:51 ` Denys Vlasenko
2008-04-22 13:32 ` [PATCH] xfs: remove unused params from functions in xfs_dir2_leaf.h Denys Vlasenko
2008-04-22 13:40 ` [PATCH] xfs: remove unused params from functions in xfs/quota/* Denys Vlasenko
2008-04-22 13:46 ` [PATCH] xfs: expose no-op xfs_put_perag() Denys Vlasenko
2008-04-22 14:08 ` Eric Sandeen
2008-04-22 23:16 ` David Chinner
2008-04-22 23:08 ` [PATCH] xfs: remove unused params from functions in xfs/quota/* David Chinner
2008-04-22 22:47 ` [PATCH] xfs: #define out unused parameters for seven functions in xfs_trans.h David Chinner
2008-04-22 14:28 ` [PATCH] xfs: #define out unused parameters of xfs_bmap_add_free and xfs_btree_read_bufl Adrian Bunk
2008-04-22 16:17 ` Denys Vlasenko
2008-04-22 17:21 ` Adrian Bunk
2008-04-22 17:26 ` Eric Sandeen
2008-04-22 17:50 ` Denys Vlasenko
2008-04-22 18:28 ` [PATCH] xfs: #define out unused parameters of?xfs_bmap_add_free " Adrian Bunk
2008-04-22 19:32 ` Denys Vlasenko
2008-04-22 23:53 ` Adrian Bunk
2008-04-22 20:46 ` [PATCH] xfs: #define out unused parameters of xfs_bmap_add_free " Denys Vlasenko
2008-04-22 22:43 ` David Chinner
2008-04-22 22:33 ` [PATCH] xfs: remove unused parameter of xfs_iomap_write_allocate David Chinner
2008-04-22 22:11 ` [PATCH] xfs: remove unused parameter of xfs_qm_dqpurge David Chinner
2008-04-23 8:18 ` Christoph Hellwig
2008-04-22 22:08 ` [PATCH] xfs: use smaller int param in call to xfs_flush_pages David Chinner
2008-04-22 3:15 ` [PATCH] xfs: do not pass unused params " Eric Sandeen
2008-04-22 8:57 ` Denys Vlasenko
2008-04-22 9:56 ` Jakub Jelinek
2008-04-22 10:33 ` Denys Vlasenko
2008-04-22 12:51 ` Eric Sandeen
2008-04-22 22:07 ` David Chinner
2008-04-22 3:09 ` [PATCH] xfs: do not pass size into kmem_free, it's unused Eric Sandeen
2008-04-22 3:35 ` Eric Sandeen
2008-04-22 22:02 ` David Chinner
2008-04-22 12:48 ` x86: 4kstacks default Denys Vlasenko
2008-04-22 13:01 ` Adrian Bunk
2008-04-22 13:51 ` Denys Vlasenko
2008-04-27 19:27 ` Jörn Engel
2008-04-27 23:02 ` Denys Vlasenko
2008-04-27 23:08 ` Eric Sandeen
2008-04-28 0:00 ` Denys Vlasenko
2008-04-20 12:37 ` Andi Kleen
2008-04-20 12:27 ` Andi Kleen
2008-04-20 12:32 ` Adrian Bunk
2008-04-20 12:47 ` Willy Tarreau
2008-04-20 13:06 ` Andi Kleen
2008-04-20 13:30 ` Adrian Bunk
2008-04-20 13:34 ` Willy Tarreau
2008-04-20 14:04 ` Adrian Bunk
2008-04-28 17:56 ` Bill Davidsen
2008-04-20 13:21 ` Adrian Bunk
2008-04-23 9:13 ` Helge Hafting
2008-04-23 23:29 ` David Chinner
2008-04-24 15:46 ` Eric Sandeen
2008-04-28 18:38 ` Bill Davidsen
2008-04-20 13:27 ` Mark Lord
2008-04-20 13:38 ` Willy Tarreau
2008-04-20 14:19 ` Andi Kleen
2008-04-20 16:41 ` Jörn Engel
2008-04-20 17:19 ` Andi Kleen
2008-04-20 17:43 ` Jörn Engel
2008-04-20 18:19 ` Andi Kleen
2008-04-20 18:50 ` Arjan van de Ven
2008-04-20 20:09 ` Andi Kleen
2008-04-20 21:50 ` Andrew Morton
2008-04-20 21:55 ` Andi Kleen
2008-04-21 14:29 ` Ingo Molnar
2008-04-20 20:32 ` Jörn Engel
2008-04-20 20:35 ` Jörn Engel
2008-04-20 14:09 ` Eric Sandeen
2008-04-20 14:20 ` Willy Tarreau
2008-04-20 14:40 ` Eric Sandeen
2008-04-20 15:44 ` Daniel Hazelton
2008-04-20 17:26 ` Andi Kleen
2008-04-20 18:48 ` Arjan van de Ven
2008-04-20 20:01 ` Andi Kleen
2008-04-20 20:43 ` Daniel Hazelton
2008-04-20 21:40 ` Andi Kleen
2008-04-20 22:17 ` Bernd Eckenfels
2008-04-20 23:48 ` Avi Kivity
2008-04-21 1:45 ` Daniel Hazelton
2008-04-21 7:51 ` Andi Kleen
2008-04-21 17:34 ` Daniel Hazelton
2008-04-20 22:33 ` Arjan van de Ven
2008-04-20 22:33 ` Arjan van de Ven
2008-04-20 23:16 ` Andi Kleen
2008-04-21 5:53 ` Arjan van de Ven
2008-04-21 3:06 ` Eric Sandeen
2008-04-20 21:45 ` Andrew Morton
2008-04-20 21:51 ` Andi Kleen
2008-04-22 18:20 ` Romano Giannetti
2008-04-23 5:03 ` Denys Vlasenko
2008-04-23 5:21 ` Daniel Hazelton
2008-04-23 5:25 ` david
2008-04-23 5:41 ` Daniel Hazelton
2008-04-23 7:46 ` Romano Giannetti
2008-04-23 11:24 ` Stefan Richter
2008-04-23 12:15 ` Romano Giannetti
2008-04-23 15:59 ` Lennart Sorensen
2008-04-20 13:22 ` Mark Lord
2008-04-19 17:49 ` Andrew Morton
2008-04-25 17:39 ` Parag Warudkar
2008-04-20 3:29 ` Eric Sandeen
2008-04-20 12:36 ` Andi Kleen
2008-04-21 14:31 ` Ingo Molnar
2008-04-23 5:27 ` Benjamin Herrenschmidt
2008-04-23 23:36 ` David Chinner
2008-04-24 0:45 ` Arjan van de Ven
2008-04-24 9:52 ` Christoph Hellwig
2008-04-24 12:25 ` Peter Zijlstra
2008-04-24 15:41 ` Chris Mason
2008-04-24 18:30 ` Alexander van Heukelum
2008-04-24 0:56 ` Benjamin Herrenschmidt
[not found] <ak6tq-32p-7@gated-at.bofh.it>
[not found] ` <ak6tq-32p-5@gated-at.bofh.it>
2008-04-19 10:56 ` Bodo Eggert
[not found] ` <akFri-4yB-25@gated-at.bofh.it>
[not found] ` <akGQg-7TX-1@gated-at.bofh.it>
[not found] ` <akKhi-91-37@gated-at.bofh.it>
2008-04-20 20:23 ` Bodo Eggert
2008-04-20 20:59 ` Daniel Hazelton
2008-04-21 20:05 ` Bodo Eggert
2008-04-22 15:34 ` Daniel Hazelton
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