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Ratelimit deadman zevents as with delay zevents

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Just as delay zevents can flood the zevent pipe when a vdev becomes
unresponsive, so do the deadman zevents.

Ratelimit deadman zevents according to the same tunable as for delay
zevents.

Enable deadman tests on FreeBSD and add a test for deadman event
ratelimiting. 

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Don Brady <don.brady@delphix.com>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11786
This commit is contained in:
Ryan Moeller
2021-04-07 19:23:57 -04:00
committed by Tony Hutter
parent 932d471bec
commit 214196e9f5
9 changed files with 102 additions and 12 deletions
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include/sys/vdev_impl.h
+2 -1
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@@ -441,10 +441,11 @@ struct vdev {
kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */
/*
* We rate limit ZIO delay and ZIO checksum events, since they
* We rate limit ZIO delay, deadman, and checksum events, since they
* can flood ZED with tons of events when a drive is acting up.
*/
zfs_ratelimit_t vdev_delay_rl;
zfs_ratelimit_t vdev_deadman_rl;
zfs_ratelimit_t vdev_checksum_rl;
};