Re: memory reclaim problems on fs usage

["Arkadiusz Miśkiewicz" <arekm@maven.pl>]

On Thursday 12 of November 2015, Arkadiusz Miśkiewicz wrote:
> On Thursday 12 of November 2015, Tetsuo Handa wrote:
> > On 2015/11/12 15:06, Arkadiusz Miśkiewicz wrote:
> > > On Wednesday 11 of November 2015, Tetsuo Handa wrote:
> > >> Arkadiusz Mi?kiewicz wrote:
> > >>> This patch is against which tree? (tried 4.1, 4.2 and 4.3)
> > >> 
> > >> Oops. Whitespace-damaged. This patch is for vanilla 4.1.2.
> > >> Reposting with one condition corrected.
> > > 
> > > Here is log:
> > > 
> > > http://ixion.pld-linux.org/~arekm/log-mm-1.txt.gz
> > > 
> > > Uncompresses is 1.4MB, so not posting here.
> > 
> > Thank you for the log. The result is unexpected for me.
> 
> [...]
> 
> > vmstat_update() and submit_flushes() remained pending for about 110
> > seconds. If xlog_cil_push_work() were spinning inside GFP_NOFS
> > allocation, it should be reported as MemAlloc: traces, but no such lines
> > are recorded. I don't know why xlog_cil_push_work() did not call
> > schedule() for so long. Anyway, applying
> > http://lkml.kernel.org/r/20151111160336.GD1432@dhcp22.suse.cz should
> > solve vmstat_update() part.
> 
> To apply that patch on top of 4.1.13 I also had to apply patches listed
> below.
> 
> So in summary appllied:
> http://sprunge.us/GYBb
> http://sprunge.us/XWUX
> http://sprunge.us/jZjV

I've tried more to trigger "page allocation failure" with usual actions that 
triggered it previously but couldn't reproduce. With these patches applied it 
doesn't happen.

Logs from my tests:

http://ixion.pld-linux.org/~arekm/log-mm-3.txt.gz
http://ixion.pld-linux.org/~arekm/log-mm-4.txt.gz (with swap added)

But are these patches solving the problem or just hiding it?

-- 
Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )

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