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3246 ZFS I/O deadman thread

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Reviewed by: Matt Ahrens <matthew.ahrens@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Christopher Siden <chris.siden@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>

NOTES: This patch has been reworked from the original in the
following ways to accomidate Linux ZFS implementation

*) Usage of the cyclic interface was replaced by the delayed taskq
   interface.  This avoids the need to implement new compatibility
   code and allows us to rely on the existing taskq implementation.

*) An extern for zfs_txg_synctime_ms was added to sys/dsl_pool.h
   because declaring externs in source files as was done in the
   original patch is just plain wrong.

*) Instead of panicing the system when the deadman triggers a
   zevent describing the blocked vdev and the first pending I/O
   is posted.  If the panic behavior is desired Linux provides
   other generic methods to panic the system when threads are
   observed to hang.

*) For reference, to delay zios by 30 seconds for testing you can
   use zinject as follows: 'zinject -d <vdev> -D30 <pool>'

References:
  illumos/illumos-gate@283b84606b
  https://www.illumos.org/issues/3246

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1396
This commit is contained in:
George.Wilson
2013-04-29 15:49:23 -07:00
committed by Brian Behlendorf
parent 57f5a2008e
commit cc92e9d0c3
20 changed files with 275 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/vdev.c
+40
View File
@@ -3195,6 +3195,46 @@ vdev_split(vdev_t *vd)
vdev_propagate_state(cvd);
}
void
vdev_deadman(vdev_t *vd)
{
int c;
for (c = 0; c < vd->vdev_children; c++) {
vdev_t *cvd = vd->vdev_child[c];
vdev_deadman(cvd);
}
if (vd->vdev_ops->vdev_op_leaf) {
vdev_queue_t *vq = &vd->vdev_queue;
mutex_enter(&vq->vq_lock);
if (avl_numnodes(&vq->vq_pending_tree) > 0) {
spa_t *spa = vd->vdev_spa;
zio_t *fio;
uint64_t delta;
/*
* Look at the head of all the pending queues,
* if any I/O has been outstanding for longer than
* the spa_deadman_synctime we log a zevent.
*/
fio = avl_first(&vq->vq_pending_tree);
delta = ddi_get_lbolt64() - fio->io_timestamp;
if (delta > NSEC_TO_TICK(spa_deadman_synctime(spa))) {
zfs_dbgmsg("SLOW IO: zio timestamp %llu, "
"delta %llu, last io %llu",
fio->io_timestamp, delta,
vq->vq_io_complete_ts);
zfs_ereport_post(FM_EREPORT_ZFS_DELAY,
spa, vd, fio, 0, 0);
}
}
mutex_exit(&vq->vq_lock);
}
}
#if defined(_KERNEL) && defined(HAVE_SPL)
EXPORT_SYMBOL(vdev_fault);
EXPORT_SYMBOL(vdev_degrade);