Re: sandy bridge kswapd0 livelock with pagecache

["Pádraig Brady" <P@draigBrady.com>]

On 23/06/11 17:59, Mel Gorman wrote:
> On Thu, Jun 23, 2011 at 04:32:27PM +0100, P?draig Brady wrote:
>> On 23/06/11 16:24, Mel Gorman wrote:
>>>
>>> Theory 2 it is then. This is to be applied on top of the patch for
>>> theory 1.
>>>
>>> ==== CUT HERE ====
>>> mm: vmscan: Prevent kswapd doing excessive work when classzone is unreclaimable
>>
>> No joy :(
>>
> 
> Joy is indeed rapidly fleeing the vicinity.
> 
> Check /proc/sys/vm/laptop_mode . If it's set, unset it and try again.

It was not set

> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index dce95dd..c8c0f5a 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2426,19 +2426,19 @@ loop_again:
>  			 * zone has way too many pages free already.
>  			 */
>  			if (!zone_watermark_ok_safe(zone, order,
> -					8*high_wmark_pages(zone), end_zone, 0))

Note 8 was not in my tree.
Manually applied patch makes no difference :(
Well maybe kswapd0 started spinning a little later.

cheers,
Padraig.

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