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authorMing Lei <ming.lei@redhat.com>2017-08-24 15:19:52 +0300
committerMike Snitzer <snitzer@redhat.com>2017-08-28 17:23:28 +0300
commitdc6364b5170dc446fca076d6523aaebc339d6511 (patch)
tree344b391746798b7fe7659de27a04f8a40edb6a4f /drivers/md/dm-bufio.c
parentd5c27f3ffbc2ee2d2f74ebfa1b2d789f67e9b3f1 (diff)
downloadlinux-dc6364b5170dc446fca076d6523aaebc339d6511.tar.xz
dm rq: do not update rq partially in each ending bio
We don't need to update the original dm request partially when ending each cloned bio: just update original dm request once when the whole cloned request is finished. This still allows full support for partial completion because a new 'completed' counter accounts for incremental progress as the clone bios complete. Partial request update can be a bit expensive, so we should try to avoid it, especially because it is run in softirq context. Avoiding all the partial request updates fixes both hard lockup and soft lockups that were easily reproduced while running Laurence's test[1] on IB/SRP. BTW, after d4acf3650c7c ("block: Make blk_mq_delay_kick_requeue_list() rerun the queue at a quiet time"), we need to make the test more aggressive for reproducing the lockup: 1) run hammer_write.sh 32 or 64 concurrently. 2) write 8M each time [1] https://marc.info/?l=linux-block&m=150220185510245&w=2 Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-bufio.c')
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