On Thu 27-04-17 18:36:38, Arthur Marsh wrote: [...] > [55363.482931] QXcbEventReader: page allocation stalls for 10048ms, order:0, > mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null) Are there more of these stalls? [...] > [55363.483040] Mem-Info: > [55363.483044] active_anon:1479559 inactive_anon:281161 isolated_anon:299 > active_file:49213 inactive_file:42134 isolated_file:0 > unevictable:4651 dirty:108 writeback:188 unstable:0 > slab_reclaimable:11225 slab_unreclaimable:20186 > mapped:204768 shmem:145888 pagetables:39859 bounce:0 > free:25470 free_pcp:0 free_cma:0 There is still quite some page cache to reclaim on the inactive list. So a progress should have been made. Maybe there was a peak memory consumption which holded this request back? [...] > [55363.483059] Node 0 DMA32 free:45556kB min:26948kB low:33684kB > high:40420kB active_anon:2273532kB inactive_anon:542768kB > active_file:99788kB inactive_file:89940kB unevictable:32kB > writepending:440kB present:3391168kB managed:3314260kB mlocked:32kB > slab_reclaimable:8800kB slab_unreclaimable:25976kB kernel_stack:7992kB > pagetables:68028kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB > [55363.483063] lowmem_reserve[]: 0 0 4734 4734 This zone is not usable due to lowmem_reserve > [55363.483066] Node 0 Normal free:40420kB min:40500kB low:50624kB > high:60748kB active_anon:3644668kB inactive_anon:581672kB > active_file:97068kB inactive_file:78784kB unevictable:18572kB > writepending:0kB present:4980736kB managed:4848692kB mlocked:18572kB > slab_reclaimable:36100kB slab_unreclaimable:54768kB kernel_stack:13544kB > pagetables:91408kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB > [55363.483069] lowmem_reserve[]: 0 0 0 0 and this one is below min watermark already. > [55363.483106] Free swap = 498568kB > [55363.483107] Total swap = 4194288kB Still ~10% of swap is free so not entirely bad. The question is whether this is reproducible. If yes then I would suggest watching /proc/vmstat (every second) and if this doesn't show anything then try to collect vmscan tracepoints $ mount -t tracefs none /debug/trace/ $ echo 1 > /debug/trace/events/vmscan/enable $ cat /debug/trace/trace_pipe > log -- 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>
