Re: OOM killer changes

[Vlastimil Babka <vbabka@suse.cz>]

On 08/15/2016 06:48 AM, Ralf-Peter Rohbeck wrote:
> On 02.08.2016 12:25, Ralf-Peter Rohbeck wrote:
>>
> Took me a little longer than expected due to work. The failure wouldn't 
> happen for a while and so I started a couple of scripts and let them 
> run. When I checked today the server didn't respond on the network and 
> sure enough it had killed everything. This is with 4.7.0 with the config 
> based on Debian 4.7-rc7.
> 
> trace_pipe got a little big (5GB) so I uploaded the logs to 
> https://filebin.net/box0wycfouvhl6sr/OOM_4.7.0.tar.bz2. before_btrfs is 
> before the btrfs filesystems were mounted.
> I did run a btrfs balance because it creates IO load and I needed to 
> balance anyway. Maybe that's what caused it?

pgmigrate_success        46738962
pgmigrate_fail          135649772
compact_migrate_scanned 309726659
compact_free_scanned   9715615169
compact_isolated        229689596
compact_stall 4777
compact_fail 3068
compact_success 1709
compact_daemon_wake 207834

The migration failures are quite enormous. Very quick analysis of the
trace seems to confirm that these are mostly "real", as opposed to result
of failure to isolate free pages for migration targets, although the free
scanner spent a lot of time:

> grep "nr_failed=32" -B1 trace_pipe.log | grep isolate_freepages.*nr_taken=0 | wc -l
3246

So is it one of the cases where fs is unable to migrate dirty/writeback pages?

Vlastimil

> I'll make the changes requested by Michal and try again.
> 
> Thanks,
> Ralf-Peter
> 
> 
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