linux-kernel - upcoming kerneloops.org item: get_page_from

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Date:	Wed, 24 Jun 2009 08:07:53 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: upcoming kerneloops.org item: get_page_from_freelist

Hi,

a new item is coming up fast in the kerneloops.org stats, and it's new
in 2.6.31-rc;

http://www.kerneloops.org/searchweek.php?search=get_page_from_freelist

it's this warning in mm/page_alloc.c:

                        * __GFP_NOFAIL is not to be used in new code.
                         *
                         * All __GFP_NOFAIL callers should be fixed so that they
                         * properly detect and handle allocation failures.
                         *
                         * We most definitely don't want callers attempting to
                         * allocate greater than single-page units with
                         * __GFP_NOFAIL.
                         */
                        WARN_ON_ONCE(order > 0);
  

typical backtraces look like

get_page_from_freelist
__alloc_pages_nodemask
alloc_pages_current
alloc_slab_page
new_slab
__slab_alloc
kmem_cache_alloc_notrace
start_this_handle
jbd2_journal_start

and

get_page_from_freelist
__alloc_pages_nodemask
alloc_pages_current
alloc_slab_page
new_slab
__slab_alloc
kmem_cache_alloc_notrace
start_this_handle
journal_start
ext3_journal_start_sb
ext3_journal_start
ext3_dirty_inode

but there are some other ones as well at the url above.


git blame shows that 

commit dab48dab37d2770824420d1e01730a107fade1aa
Author: Andrew Morton <akpm@...ux-foundation.org>
Date:   Tue Jun 16 15:32:37 2009 -0700

introduced this WARN_ON.....



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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