linux-kernel - Re: [PATCH] Re: Kernel Panic - 2.6.23-rc4-mm1 ia64 - was Re: Update: [Automatic] NUMA replicated pagecache ...

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Message-ID: <46E858D4.3080902@linux.vnet.ibm.com>
Date:	Thu, 13 Sep 2007 02:53:32 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
CC:	Andy Whitcroft <apw@...dowen.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Joachim Deguara <joachim.deguara@....com>,
	Christoph Lameter <clameter@....com>,
	Mel Gorman <mel@....ul.ie>, Eric Whitney <eric.whitney@...com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Re: Kernel Panic - 2.6.23-rc4-mm1 ia64 - was Re: Update:
 [Automatic] NUMA replicated pagecache ...

Lee Schermerhorn wrote:
> On Wed, 2007-09-12 at 16:41 +0100, Andy Whitcroft wrote:
>> On Wed, Sep 12, 2007 at 11:09:47AM -0400, Lee Schermerhorn wrote:
>>
>>>> Interesting, I don't see a memory controller function in the stack
>>>> trace, but I'll double check to see if I can find some silly race
>>>> condition in there.
>>> right.  I noticed that after I sent the mail.  
>>>
>>> Also, config available at:
>>> http://free.linux.hp.com/~lts/Temp/config-2.6.23-rc4-mm1-gwydyr-nomemcont
>> Be interested to know the outcome of any bisect you do.  Given its
>> tripping in reclaim.
> 
> Problem isolated to memory controller patches.  This patch seems to fix
> this particular problem.  I've only run the test for a few minutes with
> and without memory controller configured, but I did observe reclaim
> kicking in several times.  W/o this patch, system would panic as soon as
> I entered direct/zone reclaim--less than a minute.
> 

Thanks, excellent catch! The patch looks sane.  Thanks for your help in
sorting this issue out. Hmm.. that means I never hit direct/zone reclaim
in my tests (I'll make a mental note to enhance my test cases to cover
this scenario).

> Lee
> --------------------------------
> 
> PATCH 2.6.23-rc4-mm1 Memory Controller:  initialize all scan_controls'
> 	isolate_pages member.
> 
> We need to initialize all scan_controls' isolate_pages member.
> Otherwise, shrink_active_list() attempts to execute at undefined
> location.
> 
> Signed-off-by:  Lee Schermerhorn <lee.schermerhorn@...com>
> 
>  mm/vmscan.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> Index: Linux/mm/vmscan.c
> ===================================================================
> --- Linux.orig/mm/vmscan.c	2007-09-10 13:22:21.000000000 -0400
> +++ Linux/mm/vmscan.c	2007-09-12 15:30:27.000000000 -0400
> @@ -1758,6 +1758,7 @@ unsigned long shrink_all_memory(unsigned
>  		.swap_cluster_max = nr_pages,
>  		.may_writepage = 1,
>  		.swappiness = vm_swappiness,
> +		.isolate_pages = isolate_pages_global,
>  	};
> 
>  	current->reclaim_state = &reclaim_state;
> @@ -1941,6 +1942,7 @@ static int __zone_reclaim(struct zone *z
>  					SWAP_CLUSTER_MAX),
>  		.gfp_mask = gfp_mask,
>  		.swappiness = vm_swappiness,
> +		.isolate_pages = isolate_pages_global,
>  	};
>  	unsigned long slab_reclaimable;
> 
> 
> 


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