Thanks for your comment. On Wed, Jun 13, 2018 at 10:02 PM, Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote: > > > 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. > Please refer to: 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 #10 [ffffffc0282af8f0] do_try_to_free_pages at ffffff8008178b6c #11 [ffffffc0282af990] try_to_free_pages at ffffff8008178f3c #12 [ffffffc0282afa30] __perform_reclaim at ffffff8008169130 #13 [ffffffc0282afab0] __alloc_pages_nodemask at ffffff800816c9b8 #14 [ffffffc0282afbd0] __get_free_pages at ffffff800816cd6c #15 [ffffffc0282afbe0] alloc_buffer at ffffff8008591a94 #16 [ffffffc0282afc20] __bufio_new at ffffff8008592e94 #17 [ffffffc0282afc70] dm_bufio_prefetch at ffffff8008593198 #18 [ffffffc0282afd20] verity_prefetch_io at ffffff8008598384 #19 [ffffffc0282afd70] process_one_work at ffffff80080b5b3c #20 [ffffffc0282afdc0] worker_thread at ffffff80080b64fc #21 [ffffffc0282afe20] kthread at ffffff80080bae34 > Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
