On Sun 25-09-16 22:48:23, Lorenzo Stoakes wrote:

On Mon, Sep 19, 2016 at 10:53:48AM +0200, Michal Hocko wrote:

quoted

On Mon 19-09-16 09:42:37, Lorenzo Stoakes wrote:

quoted

On Mon, Sep 19, 2016 at 10:32:15AM +0200, Michal Hocko wrote:

quoted

so this is the same thing as in Linus case. All the zones are hitting
min wmark so the should_compact_retry() gave up. As mentioned in other
email [1] this is inherent limitation of the workaround. Your system is
swapless but there is a lot of the reclaimable page cache so Vlastimil's
patches should help.

I will experiment with a linux-next kernel and see if the problem
recurs. I've attempted to see if there is a way to manually reproduce
on the mainline kernel by performing workloads that triggered the
OOM (loading google sheets tabs, compiling a kernel, playing a video
on youtube), but to no avail - it seems the system needs to be
sufficiently fragmented first before it'll trigger.

Given that's the case, I'll just have to try using the linux-next
kernel and if you don't hear from me you can assume it did not repro
again :)

OK, fair deal ;)

Actually, I'll break the deal :) I've been running workloads similar to previous
weeks when I encountered the issue - including kernel builds, video playing,
lotsa tabs, etc. and also tried to intentionally eat up a bit of RAM from
time-to-time and have not seen a single OOM, so it looks like this is sorted it
for my system, notwithstanding Murphy's law.

Thanks for the feedback. Your testing is highly appreciated! I guess
Andrew can put your Tested-by for the latest Vlastimil patches to credit
your effort.

-- 
Michal Hocko
SUSE Labs

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