On Tue 16-08-16 13:18:25, Arkadiusz Miskiewicz wrote: > On Monday 15 of August 2016, Michal Hocko wrote: > > [Fixing up linux-mm] > > > > Ups I had a c&p error in the previous patch. Here is an updated patch. > > > Going to apply this patch now and report again. I mean time what I have is a > > while (true); do echo "XX date"; date; echo "XX SLAB"; cat /proc/slabinfo ; > echo "XX VMSTAT"; cat /proc/vmstat ; echo "XX free"; free; echo "XX DMESG"; > dmesg -T | tail -n 50; /bin/sleep 60;done 2>&1 | tee log > > loop gathering some data while few OOM conditions happened. > > I was doing "rm -rf copyX; cp -al original copyX" 10x in parallel. > > https://ixion.pld-linux.org/~arekm/p2/ext4/log-20160816.txt David was right when assuming it would be the ext4 inode cache which consumes the large portion of the memory. /proc/slabinfo shows ext4_inode_cache consuming between 2.5 to 4.6G of memory. first value last-first pgmigrate_success 1861785 2157917 pgmigrate_fail 335344 1400384 compact_isolated 4106390 5777027 compact_migrate_scanned 113962774 446290647 compact_daemon_wake 17039 43981 compact_fail 645 1039 compact_free_scanned 381701557 793430119 compact_success 217 307 compact_stall 862 1346 which means that we have invoked compaction 1346 times and failed in 77% of cases. It is interesting to see that the migration wasn't all that unsuccessful. We managed to migrate 1.5x more pages than failed. It smells like the compaction just backs off. Could you try to test with patch from http://lkml.kernel.org/r/20160816031222.GC16913@js1304-P5Q-DELUXE please? Ideally on top of linux-next. You can add both the compaction counters patch in the oom report and high order atomic reserves patch on top. Thanks -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>