On Tue, 12 Jun 2018, Mike Snitzer wrote: > On Tue, Jun 12 2018 at 4:03am -0400, > Jing Xia <jing.xia.mail@xxxxxxxxx> wrote: > > > Performance test in android reports that the phone sometimes gets > > hanged and shows black screen for about several minutes.The sysdump shows: > > 1. kswapd and other tasks who enter the direct-reclaim path are waiting > > on the dm_bufio_lock; > > Do you have an understanding of where they are waiting? Is it in > dm_bufio_shrink_scan()? > > > 2. the task who gets the dm_bufio_lock is stalled for IO completions, > > the relevant stack trace as : > > > > PID: 22920 TASK: ffffffc0120f1a00 CPU: 1 COMMAND: "kworker/u8:2" > > #0 [ffffffc0282af3d0] __switch_to at ffffff8008085e48 > > #1 [ffffffc0282af3f0] __schedule at ffffff8008850cc8 > > #2 [ffffffc0282af450] schedule at ffffff8008850f4c > > #3 [ffffffc0282af470] schedule_timeout at ffffff8008853a0c > > #4 [ffffffc0282af520] schedule_timeout_uninterruptible at ffffff8008853aa8 > > #5 [ffffffc0282af530] wait_iff_congested at ffffff8008181b40 > > #6 [ffffffc0282af5b0] shrink_inactive_list at ffffff8008177c80 > > #7 [ffffffc0282af680] shrink_lruvec at ffffff8008178510 > > #8 [ffffffc0282af790] mem_cgroup_shrink_node_zone at ffffff80081793bc > > #9 [ffffffc0282af840] mem_cgroup_soft_limit_reclaim at ffffff80081b6040 Please send the full stacktrace of this task. Then, we can see, why is it waiting here. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
