Leland, SuSE told me that in bnc#859225. They dropped the changes meaning they don't revert the patch. Instead development added a series of fixes.
The new set of patches were build March 11th, so the mailinglist was just
not updated with that information yet.
The crucial patch development added is
patches.suse/mm-vmscan-Do-not-force-reclaim-file-pages-until-it-exceeds-anon.patch
which reduces the impact of the swap protection by force scanning file
LRU. It should act as a previous revert with the load we are seeing. Other
patches shouldn't matter much for this load but they are good in general
and they have passed development's testing with swap sensitive workloads so
the risk of the regression is low.
After the successful testing of a customer, the patches were pushed to the
SLE11-SP3 branch. A future update is due soon and it will include the
patches.
________________________
Mike O'Reilly
IBM Linux Change Team
Leland Lucius
<llucius@homerow.
net> To
Sent by: Linux on LINUX-390@vm.marist.edu,
390 Port cc
<linux-...@vm.mar
ist.edu> Subject
Re: SLES 11 SP3 problems
03/13/2014 12:39
PM
Please respond to
Linux on 390 Port
<linux-...@vm.mar
ist.edu>
Wanted to follow up.
Just today we FINALLY got the patched kernel
(3.0.101-0.15.1.6580.16.PTF.859225) from Novell (unbelievable saga!!!).
Changelog shows these changes:
* Tue Mar 11 2014 sto...@suse.de
-
patches.suse/mm-vmscan-Update-rotated-and-scanned-when-force-reclaimed.patch
patches.suse/mm-vmscan-fix-endless-loop-in-kswapd-balancing.patch
patches.suse/mm-vmscan-Do-not-force-reclaim-file-pages-until-it-exceeds-anon.patch
patches.suse/mm-page-writeback.c-do-not-count-anon-pages-as-dirtyable-memory.patch
bnc#859225
I wonder why that differed from yours?
Leland
On 3/7/2014 4:51 PM, Marcy Cortes wrote:
> Ah thanks. And great to know that the future kernel doesn't suffer from
this!
>
> Good work!
>
>
>
> Marcy. Sent from my BlackBerry.
>
>
> ----- Original Message -----
> From: Leland Lucius [mailto:lluc...@homerow.net]
> Sent: Friday, March 07, 2014 04:24 PM Central Standard Time
> To: LINUX-390@VM.MARIST.EDU <LINUX-390@VM.MARIST.EDU>
> Subject: Re: [LINUX-390] SLES 11 SP3 problems
>
> On 3/7/2014 3:57 PM, Marcy Cortes wrote:
>> weird, could the combo of the two of them be to blame?
> I'm sure they got it right. Especially since that bit of code has been
> effectively reverted in upstream as well at later kernel versions and
> why I wasn't able to make it happen in a 3.13.5 kernel.
>
> The method I used to try and figure out the cause probably changed
> things enough where the real problem was simply bypassed in some way. I
> can honestly say that the vmscan code is WAY over my head, so I was
> really just taking shots in the dark. Anything to try and push for a
> resolution to the problem.
>
> My method for recreating the problem was a little C program that simply
> allocated a bunch of memory over and over while I'm dropping the caches
> in another ssh session. Worked very reliably. But, with the patch
> reverted, I am no longer able to recreate the issue after many attempts.
>
> Thanks again,
>
> Leland
>
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