Re: memory reclaim problems on fs usage

[Michal Hocko <mhocko@suse.cz>]

On Sun 15-11-15 15:49:35, Arkadiusz Miśkiewicz wrote:
> On Sunday 15 of November 2015, Tetsuo Handa wrote:
> > Arkadiusz Miskiewicz wrote:
> > > On Sunday 15 of November 2015, Tetsuo Handa wrote:
> > > > I think that the vmstat statistics now have correct values.
> > > > 
> > > > > But are these patches solving the problem or just hiding it?
> > > > 
> > > > Excuse me but I can't judge.
> > > > 
> > > > If you are interested in monitoring how vmstat statistics are changing
> > > > under stalled condition, you can try below patch.
> > > 
> > > Here is log with this and all previous patches applied:
> > > http://ixion.pld-linux.org/~arekm/log-mm-5.txt.gz
> > 
> > Regarding "Node 0 Normal" (min:7104kB low:8880kB high:10656kB),
> > all free: values look sane to me. I think that your problem was solved.
> 
> Great, thanks!
> 
> Will all (or part) of these patches
> 
> http://sprunge.us/GYBb

Migrate reserves are not a stable material I am afraid. "vmstat:
explicitly schedule per-cpu work on the CPU we need it to run on"
was not marked for stable either but I am not sure why it should make
any difference for your load. I understand that testing this is really
tedious but it would be better to know which of the patches actually
made a difference.

> http://sprunge.us/XWUX (after it gets merged)

Yes I plan to mark this one for stable.
 
> be pushed to stable@ or are too risky for stable ?
> 
> > 
> > $ grep "Normal free:" log-mm-5.txt | cut -b 44- | awk -F' ' ' { print $4 }
> > ' | cut -b 6- | sort -g 8608kB
> > 8636kB
> > 8920kB
> > 8920kB
> > 8952kB
> > 8968kB
> > 8980kB
> > (...snipped...)
> > 215364kB
> > 290068kB
> > 290428kB
> > 291176kB
> > 292836kB
> > 303992kB
> > 306468kB
> > 318080kB
> > 319548kB
> > 
> > $ grep "Normal free:" log-mm-1.txt | cut -b 44- | awk -F' ' ' { print $4 }
> > ' | cut -b 6- | sort -g 0kB
> > 40kB
> > 128kB
> > 128kB
> > 128kB
> > 128kB
> > 128kB
> > 128kB
> > 128kB
> > 128kB
> > (...snipped...)
> > 412kB
> > 616kB
> > 1268kB
> > 1544kB
> > 1696kB
> > 2756kB
> > 2756kB
> > 2756kB
> > 2756kB
> > 2756kB
> > 2756kB
> > 2756kB
> 
> 
> -- 
> Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )

-- 
Michal Hocko
SUSE Labs

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