From: Christoph Lameter <clameter@sgi.com>
To: Jens Osterkamp <Jens.Osterkamp@gmx.de>
Cc: Pekka J Enberg <penberg@cs.helsinki.fi>, linux-mm@kvack.org
Subject: Re: [BUG] in 2.6.25-rc3 with 64k page size and SLUB_DEBUG_ON
Date: Tue, 18 Mar 2008 10:45:51 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0803181043390.21992@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <200803181744.58735.Jens.Osterkamp@gmx.de>
On Tue, 18 Mar 2008, Jens Osterkamp wrote:
> Actually the caller expects exactly that. The kmalloc that I saw was coming
> from alloc_thread_info in dup_task_struct. For 4k pages this maps to
> __get_free_pages whereas for 64k pages it maps to kmalloc.
> The result of __get_free_pages seem to be aligned and kmalloc (with slub_debug)
> of course not. That explains the 4k/64k difference and the crash I am seeing...
> but I can't think of a reasonable fix right now as I don't understand the
> reason for the difference in the allocation code (yet).
One simple solution is to create a special slab and specify the alignment
you want. The other is to use the page allocator which also gives you
guaranteed alignment.
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next prev parent reply other threads:[~2008-03-18 17:45 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-06 13:47 [BUG] in 2.6.25-rc3 with 64k page size and SLUB_DEBUG_ON Jens Osterkamp
2008-03-06 19:55 ` Christoph Lameter
2008-03-06 21:07 ` Jens Osterkamp
2008-03-06 21:50 ` Christoph Lameter
2008-03-06 21:52 ` Jens Osterkamp
2008-03-06 21:56 ` Christoph Lameter
2008-03-06 22:00 ` Pekka Enberg
2008-03-06 22:04 ` Pekka Enberg
2008-03-06 22:07 ` Jens Osterkamp
2008-03-06 22:20 ` Christoph Lameter
2008-03-06 22:24 ` Pekka Enberg
2008-03-07 12:20 ` Jens Osterkamp
2008-03-07 12:40 ` Pekka J Enberg
2008-03-07 12:44 ` Pekka J Enberg
2008-03-07 22:18 ` Jens Osterkamp
2008-03-07 22:30 ` Jens Osterkamp
2008-03-07 22:59 ` Christoph Lameter
2008-03-12 15:19 ` Jens Osterkamp
2008-03-12 23:34 ` Christoph Lameter
2008-03-18 16:44 ` Jens Osterkamp
2008-03-18 17:45 ` Christoph Lameter [this message]
2008-03-18 17:51 ` Pekka Enberg
2008-03-06 22:25 ` Jens Osterkamp
2008-03-07 22:09 ` Jens Osterkamp
2008-03-06 22:21 ` Jens Osterkamp
2008-03-06 21:27 ` Pekka Enberg
2008-03-06 21:45 ` Ingo Molnar
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