linux-kernel - Re: 2.6.23-rc6-mm1 panic (memory controller issue ?)

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Message-ID: <46F08135.70401@linux.vnet.ibm.com>
Date:	Wed, 19 Sep 2007 07:23:57 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Badari Pulavarty <pbadari@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, balbir@...ibm.com,
	clameter@....com, lkml <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.23-rc6-mm1 panic (memory controller issue ?)

Badari Pulavarty wrote:
> On Tue, 2007-09-18 at 15:21 -0700, Badari Pulavarty wrote:
>> Hi Balbir,
>>
>> I get following panic from SLUB, while doing simple fsx tests.
>> I haven't used any container/memory controller stuff except 
>> that I configured them in :(
>>
>> Looks like slub doesn't like one of the flags passed in ?
>>
>> Known issue ? Ideas ?
>>
> 
> I think, I found the issue. I am still running tests to
> verify. Does this sound correct ?
> 
> Thanks,
> Badari
> 
> Need to strip __GFP_HIGHMEM flag while passing to mem_container_cache_charge().
> 
> Signed-off-by: Badari Pulavarty <pbadari@...ibm.com>
>  mm/filemap.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6.23-rc6/mm/filemap.c
> ===================================================================
> --- linux-2.6.23-rc6.orig/mm/filemap.c	2007-09-18 12:43:54.000000000 -0700
> +++ linux-2.6.23-rc6/mm/filemap.c	2007-09-18 19:14:44.000000000 -0700
> @@ -441,7 +441,8 @@ int filemap_write_and_wait_range(struct 
>  int add_to_page_cache(struct page *page, struct address_space *mapping,
>  		pgoff_t offset, gfp_t gfp_mask)
>  {
> -	int error = mem_container_cache_charge(page, current->mm, gfp_mask);
> +	int error = mem_container_cache_charge(page, current->mm,
> +			gfp_mask & ~__GFP_HIGHMEM);
>  	if (error)
>  		goto out;
> 
> 
> 

Hi, Badari,

The fix looks correct, radix_tree_preload() does the same thing in
add_to_page_cache(). Thanks for identifying the fix

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
-
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