Re: sandy bridge kswapd0 livelock with pagecache

["Pádraig Brady" <P@draigBrady.com>]

On 21/06/11 12:34, Mel Gorman wrote:
> On Tue, Jun 21, 2011 at 11:47:35AM +0100, P?draig Brady wrote:
>> On 21/06/11 11:39, Mel Gorman wrote:
>>> On Tue, Jun 21, 2011 at 10:53:02AM +0100, P?draig Brady wrote:
>>>> I tried the 2 patches here to no avail:
>>>> http://marc.info/?l=linux-mm&m=130503811704830&w=2
>>>>
>>>> I originally logged this at:
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=712019
>>>>
>>>> I can compile up and quickly test any suggestions.
>>>>
>>>
>>> I recently looked through what kswapd does and there are a number
>>> of problem areas. Unfortunately, I haven't gotten around to doing
>>> anything about it yet or running the test cases to see if they are
>>> really problems. In your case, the following is a strong possibility
>>> though. This should be applied on top of the two patches merged from
>>> that thread.
>>>
>>> This is not tested in any way, based on 3.0-rc3
>>
>> This does not fix the issue here.
>>
> 
> I made a silly mistake here.  When you mentioned two patches applied,
> I assumed you meant two patches that were finally merged from that
> discussion thread instead of looking at your linked mail. Now that I
> have checked, I think you applied the SLUB patches while the patches
> I was thinking of are;
> 
> [afc7e326: mm: vmscan: correct use of pgdat_balanced in sleeping_prematurely]
> [f06590bd: mm: vmscan: correctly check if reclaimer should schedule during shrink_slab]
> 
> The first one in particular has been reported by another user to fix
> hangs related to copying large files. I'm assuming you are testing
> against the Fedora kernel. As these patches were merged for 3.0-rc1, can
> you check if applying just these two patches to your kernel helps?

These patches are already present in my 2.6.38.8-32.fc15.x86_64 kernel :(

cheers,
Padraig.

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