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19
Re: x86: 4kstacks default
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From:
Ingo Molnar <mingo@...>
To: Arjan van de Ven <arjan@...>
Cc: Shawn Bohrer <shawn.bohrer@...>, Andrew Morton <akpm@...>, Linux Kernel Mailing List <linux-kernel@...>, Thomas Gleixner <tglx@...>
Subject:
Re: x86: 4kstacks default
Date: Saturday, April 19, 2008 - 2:33 pm
* Arjan van de Ven <arjan@infradead.org> wrote:
quoted text
> On Sat, 19 Apr 2008 09:59:48 -0500 > Shawn Bohrer <shawn.bohrer@gmail.com> wrote: > > > On Sat, Apr 19, 2008 at 04:23:29PM +0200, Ingo Molnar wrote: > > > > > > * Andrew Morton <akpm@linux-foundation.org> wrote: > > > > > > > > config 4KSTACKS > > > > > bool "Use 4Kb for kernel stacks instead of 8Kb" > > > > > - depends on DEBUG_KERNEL > > > > > depends on X86_32 > > > > > + default y > > > > > > > > This patch will cause kernels to crash. > > > > > > what mainline kernels crash and how will they crash? Fedora and > > > other distros have had 4K stacks enabled for years: > > > > If by other distros you mean RHEL then yes. However, openSUSE, > > Ubuntu, and Mandriva all still have 8K stacks. I know of no other > > distributions that default to 4K. > > centos, oracle and redflag tend to follow the RHEL/fedora settings. > > To be honest, at this point we're at a situation where > * Several very popular distributions have this enabled for 5+ years, > apparently without any real issues (otherwise the enterprise releases > would have turned this off) > * The early "hot known issues" have been resolved afaik, things like > block device stacking, and symlink recursion lookups are either no longer > recursive, or a lot less recursive than they used to be. > > There are clear benefits to 4K stacks (no need to reiterate the flamewar, > but worth mentioning) > * Less memory consumption in the lowmem zone (critical for enterprise use, > also good for general performance) > * Kernel stacks at 8K are one of the most prominent order-1 allocations in the > kernel; again with big-memory systems the fragmentation of the lowmem zone > is a problem (and the distros that ship 4K stacks went there because of customer > complaints) > > On the flipside the arguments tend to be > 1) certain stackings of components still runs the risk of overflowing > 2) I want to run ndiswrapper > 3) general, unspecified uneasyness. > > For 1), we need to know which they are, and then solve them, because > even on x86-64 with 8k stacks they can be a problem (just because the > stack frames are bigger, although not quite double, there). I've not > seen any recent reports, I'll try to extend the kerneloops.org client > to collect the "stack is getting low" warning to be able to see how > much this really happens. > > for 2), the real answer there is "ndiswrapper needs 12kb not 8kb" > > for 3), this is hard to deal with but also generally unfounded... you > can use this argument against any change in the kernel.
and lets observe it that 8K stacks are of course still offered, so if anyone disables 4K stacks in the .config, it will stay disabled. Ingo --
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Messages in current thread:
Re: x86: 4kstacks default
, Andrew Morton
, (Fri Apr 18, 5:29 pm)
Re: x86: 4kstacks default
, Ingo Molnar
, (Sat Apr 19, 10:23 am)
Re: x86: 4kstacks default
, Benjamin Herrenschmidt
, (Wed Apr 23, 1:27 am)
Re: x86: 4kstacks default
, David Chinner
, (Wed Apr 23, 7:36 pm)
Re: x86: 4kstacks default
, Benjamin Herrenschmidt
, (Wed Apr 23, 8:56 pm)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Wed Apr 23, 8:45 pm)
Re: x86: 4kstacks default
, Christoph Hellwig
, (Thu Apr 24, 5:52 am)
Re: x86: 4kstacks default
, Chris Mason
, (Thu Apr 24, 11:41 am)
Re: x86: 4kstacks default
, Alexander van Heukelum
, (Thu Apr 24, 2:30 pm)
Re: x86: 4kstacks default
, Peter Zijlstra
, (Thu Apr 24, 8:25 am)
Re: x86: 4kstacks default
, Oliver Pinter
, (Sat Apr 19, 10:35 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sat Apr 19, 11:19 am)
Re: x86: 4kstacks default
, Oliver Pinter
, (Sat Apr 19, 11:42 am)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sat Apr 19, 9:56 pm)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 3:42 am)
Re: x86: 4kstacks default
, Chris Wedgwood
, (Sun Apr 20, 12:59 pm)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sat Apr 19, 11:29 pm)
Re: x86: 4kstacks default
, Ingo Molnar
, (Mon Apr 21, 10:31 am)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 8:36 am)
Re: x86: 4kstacks default
, Shawn Bohrer
, (Sat Apr 19, 10:59 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 4:09 am)
Re: x86: 4kstacks default
, Alan Cox
, (Sun Apr 20, 4:06 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 4:51 am)
Re: x86: 4kstacks default
, Alan Cox
, (Sun Apr 20, 5:36 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 6:44 am)
Re: x86: 4kstacks default
, Mark Lord
, (Sun Apr 20, 9:22 am)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 8:27 am)
Re: x86: 4kstacks default
, Daniel Hazelton
, (Sun Apr 20, 11:44 am)
Re: x86: 4kstacks default
, Romano Giannetti
, (Tue Apr 22, 2:20 pm)
Re: x86: 4kstacks default
, Denys Vlasenko
, (Wed Apr 23, 1:03 am)
Re: x86: 4kstacks default
, Daniel Hazelton
, (Wed Apr 23, 1:21 am)
Re: x86: 4kstacks default
,
, (Wed Apr 23, 1:25 am)
Re: x86: 4kstacks default
, Daniel Hazelton
, (Wed Apr 23, 1:41 am)
Re: x86: 4kstacks default
, Romano Giannetti
, (Wed Apr 23, 3:46 am)
Re: x86: 4kstacks default
, Stefan Richter
, (Wed Apr 23, 7:24 am)
Re: x86: 4kstacks default
, Romano Giannetti
, (Wed Apr 23, 8:15 am)
Re: x86: 4kstacks default
, Lennart Sorensen
, (Wed Apr 23, 11:59 am)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 1:26 pm)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Sun Apr 20, 2:48 pm)
Re: x86: 4kstacks default
, Andrew Morton
, (Sun Apr 20, 5:45 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 5:51 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 4:01 pm)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Sun Apr 20, 6:33 pm)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Sun Apr 20, 6:33 pm)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sun Apr 20, 11:06 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 7:16 pm)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Mon Apr 21, 1:53 am)
Re: x86: 4kstacks default
, Daniel Hazelton
, (Sun Apr 20, 4:43 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 5:40 pm)
Re: x86: 4kstacks default
, Daniel Hazelton
, (Sun Apr 20, 9:45 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Mon Apr 21, 3:51 am)
Re: x86: 4kstacks default
, Daniel Hazelton
, (Mon Apr 21, 1:34 pm)
Re: x86: 4kstacks default
, Bernd Eckenfels
, (Sun Apr 20, 6:17 pm)
Re: x86: 4kstacks default
, Avi Kivity
, (Sun Apr 20, 7:48 pm)
Re: x86: 4kstacks default
, Willy Tarreau
, (Sun Apr 20, 8:47 am)
Re: x86: 4kstacks default
, Mark Lord
, (Sun Apr 20, 9:27 am)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sun Apr 20, 10:09 am)
Re: x86: 4kstacks default
, Willy Tarreau
, (Sun Apr 20, 10:20 am)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sun Apr 20, 10:40 am)
Re: x86: 4kstacks default
, Willy Tarreau
, (Sun Apr 20, 9:38 am)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 10:19 am)
Re: x86: 4kstacks default
, Jörn
, (Sun Apr 20, 12:41 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 1:19 pm)
Re: x86: 4kstacks default
, Jörn
, (Sun Apr 20, 1:43 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 2:19 pm)
Re: x86: 4kstacks default
, Jörn
, (Sun Apr 20, 4:35 pm)
Re: x86: 4kstacks default
, Jörn
, (Sun Apr 20, 4:32 pm)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Sun Apr 20, 2:50 pm)
Re: x86: 4kstacks default
, Andrew Morton
, (Sun Apr 20, 5:50 pm)
Re: x86: 4kstacks default
, Ingo Molnar
, (Mon Apr 21, 10:29 am)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 5:55 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 4:09 pm)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 9:21 am)
Re: x86: 4kstacks default
, Bill Davidsen
, (Mon Apr 28, 2:38 pm)
Re: x86: 4kstacks default
, Helge Hafting
, (Wed Apr 23, 5:13 am)
Re: x86: 4kstacks default
, Eric Sandeen
, (Thu Apr 24, 11:46 am)
Re: x86: 4kstacks default
, David Chinner
, (Wed Apr 23, 7:29 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 9:06 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 9:30 am)
Re: x86: 4kstacks default
, Bill Davidsen
, (Mon Apr 28, 1:56 pm)
Re: x86: 4kstacks default
, Willy Tarreau
, (Sun Apr 20, 9:34 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 10:04 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 8:32 am)
Re: x86: 4kstacks default
, Alan Cox
, (Sun Apr 20, 7:02 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 7:54 am)
Re: x86: 4kstacks default
, Andi Kleen
, (Sun Apr 20, 8:37 am)
Re: x86: 4kstacks default
, Alan Cox
, (Sun Apr 20, 7:37 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 8:18 am)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sun Apr 20, 10:05 am)
Re: x86: 4kstacks default
, Denys Vlasenko
, (Mon Apr 21, 3:45 am)
Re: x86: 4kstacks default
, Eric Sandeen
, (Mon Apr 21, 9:29 am)
Re: x86: 4kstacks default
, Denys Vlasenko
, (Mon Apr 21, 3:51 pm)
Re: x86: 4kstacks default
, David Chinner
, (Mon Apr 21, 9:28 pm)
Re: x86: 4kstacks default
, Jörn
, (Sun Apr 27, 3:27 pm)
Re: x86: 4kstacks default
, Denys Vlasenko
, (Sun Apr 27, 7:02 pm)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sun Apr 27, 7:08 pm)
Re: x86: 4kstacks default
, Denys Vlasenko
, (Sun Apr 27, 8:00 pm)
Re: x86: 4kstacks default
, Denys Vlasenko
, (Tue Apr 22, 8:48 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Tue Apr 22, 9:01 am)
Re: x86: 4kstacks default
, Denys Vlasenko
, (Tue Apr 22, 9:51 am)
[PATCH] xfs: do not pass size into kmem_free, it's unused
, Denys Vlasenko
, (Mon Apr 21, 10:33 pm)
Re: [PATCH] xfs: do not pass size into kmem_free, it's unused
, David Chinner
, (Tue Apr 22, 6:02 pm)
Re: [PATCH] xfs: do not pass size into kmem_free, it's unused
, Eric Sandeen
, (Mon Apr 21, 11:09 pm)
Re: [PATCH] xfs: do not pass size into kmem_free, it's unused
, Eric Sandeen
, (Mon Apr 21, 11:35 pm)
[PATCH] xfs: do not pass unused params to xfs_flush_pages
, Denys Vlasenko
, (Mon Apr 21, 11:03 pm)
Re: [PATCH] xfs: do not pass unused params to xfs_flush_pages
, David Chinner
, (Tue Apr 22, 6:07 pm)
Re: [PATCH] xfs: do not pass unused params to xfs_flush_pages
, Eric Sandeen
, (Mon Apr 21, 11:15 pm)
Re: [PATCH] xfs: do not pass unused params to xfs_flush_pages
, Denys Vlasenko
, (Tue Apr 22, 4:57 am)
Re: [PATCH] xfs: do not pass unused params to xfs_flush_pages
, Eric Sandeen
, (Tue Apr 22, 8:51 am)
Re: [PATCH] xfs: do not pass unused params to xfs_flush_pages
, Jakub Jelinek
, (Tue Apr 22, 5:56 am)
Re: [PATCH] xfs: do not pass unused params to xfs_flush_pages
, Denys Vlasenko
, (Tue Apr 22, 6:33 am)
[PATCH] xfs: use smaller int param in call to xfs_flush_pages
, Denys Vlasenko
, (Mon Apr 21, 11:14 pm)
Re: [PATCH] xfs: use smaller int param in call to xfs_flush_...
, David Chinner
, (Tue Apr 22, 6:08 pm)
[PATCH] xfs: remove unused parameter of xfs_qm_dqpurge
, Denys Vlasenko
, (Tue Apr 22, 5:42 am)
Re: [PATCH] xfs: remove unused parameter of xfs_qm_dqpurge
, Christoph Hellwig
, (Wed Apr 23, 4:18 am)
Re: [PATCH] xfs: remove unused parameter of xfs_qm_dqpurge
, David Chinner
, (Tue Apr 22, 6:11 pm)
[PATCH] xfs: remove unused parameter of xfs_iomap_write_allo...
, Denys Vlasenko
, (Tue Apr 22, 6:16 am)
Re: [PATCH] xfs: remove unused parameter of xfs_iomap_write_...
, David Chinner
, (Tue Apr 22, 6:33 pm)
Re: [PATCH] xfs: #define out unused parameters of xfs_bmap_a...
, Denys Vlasenko
, (Tue Apr 22, 7:20 am)
Re: [PATCH] xfs: #define out unused parameters of xfs_bmap_a...
, David Chinner
, (Tue Apr 22, 6:43 pm)
Re: [PATCH] xfs: #define out unused parameters of xfs_bmap_a...
, Adrian Bunk
, (Tue Apr 22, 10:28 am)
Re: [PATCH] xfs: #define out unused parameters of xfs_bmap_a...
, Denys Vlasenko
, (Tue Apr 22, 12:17 pm)
Re: [PATCH] xfs: #define out unused parameters of xfs_bmap_a...
, Adrian Bunk
, (Tue Apr 22, 1:21 pm)
Re: [PATCH] xfs: #define out unused parameters of xfs_bmap_a...
, Eric Sandeen
, (Tue Apr 22, 1:26 pm)
Re: [PATCH] xfs: #define out unused parameters
, Denys Vlasenko
, (Tue Apr 22, 4:46 pm)
Re: [PATCH] xfs: #define out unused parameters
, Denys Vlasenko
, (Tue Apr 22, 1:50 pm)
Re: [PATCH] xfs: #define out unused parameters of?xfs_bmap_a...
, Adrian Bunk
, (Tue Apr 22, 2:28 pm)
Re: [PATCH] xfs: #define out unused parameters of?xfs_bmap_a...
, Denys Vlasenko
, (Tue Apr 22, 3:32 pm)
Re: [PATCH] xfs: #define out unused parameters of?xfs_bmap_a...
, Adrian Bunk
, (Tue Apr 22, 7:53 pm)
[PATCH] xfs: #define out unused parameters for seven functio...
, Denys Vlasenko
, (Tue Apr 22, 7:51 am)
Re: [PATCH] xfs: #define out unused parameters for seven fun...
, David Chinner
, (Tue Apr 22, 6:47 pm)
[PATCH] xfs: remove unused params from functions in xfs_dir2...
, Denys Vlasenko
, (Tue Apr 22, 9:32 am)
[PATCH] xfs: remove unused params from functions in xfs/quot...
, Denys Vlasenko
, (Tue Apr 22, 9:40 am)
Re: [PATCH] xfs: remove unused params from functions in xfs/...
, David Chinner
, (Tue Apr 22, 7:08 pm)
[PATCH] xfs: expose no-op xfs_put_perag()
, Denys Vlasenko
, (Tue Apr 22, 9:46 am)
Re: [PATCH] xfs: expose no-op xfs_put_perag()
, David Chinner
, (Tue Apr 22, 7:16 pm)
Re: [PATCH] xfs: expose no-op xfs_put_perag()
, Eric Sandeen
, (Tue Apr 22, 10:08 am)
[PATCH] xfs: #define out unused parameters for seven functio...
, Denys Vlasenko
, (Tue Apr 22, 7:48 am)
Re: [PATCH] xfs: use smaller int param in call to xfs_flush_...
, Eric Sandeen
, (Mon Apr 21, 11:18 pm)
Re: [PATCH] xfs: use smaller int param in call to xfs_flush_...
, David Chinner
, (Tue Apr 22, 12:10 am)
Re: x86: 4kstacks default
, Denys Vlasenko
, (Mon Apr 21, 4:28 pm)
Re: x86: 4kstacks default
, Andi Kleen
, (Mon Apr 21, 5:55 am)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Sun Apr 20, 11:41 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 12:03 pm)
Re: x86: 4kstacks default
, Alexander E. Patrakov
, (Sun Apr 20, 11:30 pm)
Re: x86: 4kstacks default
, Helge Hafting
, (Wed Apr 23, 4:57 am)
Re: x86: 4kstacks default
, Adrian Bunk
, (Sun Apr 20, 10:21 am)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sun Apr 20, 10:56 am)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Sat Apr 19, 2:00 pm)
Re: x86: 4kstacks default
, Eric Sandeen
, (Sat Apr 19, 10:36 pm)
Re: x86: 4kstacks default
, David Chinner
, (Sun Apr 20, 6:53 pm)
Re: x86: 4kstacks default
, Arjan van de Ven
, (Sun Apr 20, 2:11 am)
Re: x86: 4kstacks default
, Ingo Molnar
, (Sat Apr 19, 2:33 pm)
Re: x86: 4kstacks default
, Stefan Richter
, (Sat Apr 19, 3:10 pm)
Re: x86: 4kstacks default
, Andrew Morton
, (Sat Apr 19, 1:49 pm)
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