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Parallelize vdev_validate 

The runtime of vdev_validate is dominated by the disk accesses in
vdev_label_read_config.  Speed it up by validating all vdevs in
parallel using a taskq.

Sponsored by: Axcient
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alan Somers <asomers@gmail.com>
Closes #11470
This commit is contained in:
Alan Somers 2021-01-12 15:25:52 -07:00 committed by Brian Behlendorf
parent 67874d5487
commit cf0977ad72
3 changed files with 41 additions and 3 deletions
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2
include/sys/vdev_impl.h
View File

@ -271,7 +271,9 @@ struct vdev {
boolean_t vdev_nonrot; /* true if solid state */
int vdev_load_error; /* error on last load */
int vdev_open_error; /* error on last open */
int vdev_validate_error; /* error on last validate */
kthread_t *vdev_open_thread; /* thread opening children */
kthread_t *vdev_validate_thread; /* thread validating children */
uint64_t vdev_crtxg; /* txg when top-level was added */
/*

39
module/zfs/vdev.c
View File

@ -2136,6 +2136,16 @@ vdev_open(vdev_t *vd)
return (0);
}
static void
vdev_validate_child(void *arg)
{
vdev_t *vd = arg;
vd->vdev_validate_thread = curthread;
vd->vdev_validate_error = vdev_validate(vd);
vd->vdev_validate_thread = NULL;
}
/*
* Called once the vdevs are all opened, this routine validates the label
* contents. This needs to be done before vdev_load() so that we don't
@ -2150,18 +2160,43 @@ int
vdev_validate(vdev_t *vd)
{
spa_t *spa = vd->vdev_spa;
taskq_t *tq = NULL;
nvlist_t *label;
uint64_t guid = 0, aux_guid = 0, top_guid;
uint64_t state;
nvlist_t *nvl;
uint64_t txg;
int children = vd->vdev_children;
if (vdev_validate_skip)
return (0);
for (uint64_t c = 0; c < vd->vdev_children; c++)
if (vdev_validate(vd->vdev_child[c]) != 0)
if (children > 0) {
tq = taskq_create("vdev_validate", children, minclsyspri,
children, children, TASKQ_PREPOPULATE);
}
for (uint64_t c = 0; c < children; c++) {
vdev_t *cvd = vd->vdev_child[c];
if (tq == NULL || vdev_uses_zvols(cvd)) {
vdev_validate_child(cvd);
} else {
VERIFY(taskq_dispatch(tq, vdev_validate_child, cvd,
TQ_SLEEP) != TASKQID_INVALID);
}
}
if (tq != NULL) {
taskq_wait(tq);
taskq_destroy(tq);
}
for (int c = 0; c < children; c++) {
int error = vd->vdev_child[c]->vdev_validate_error;
if (error != 0)
return (SET_ERROR(EBADF));
}
/*
* If the device has already failed, or was marked offline, don't do

3
module/zfs/vdev_label.c
View File

@ -763,7 +763,8 @@ vdev_label_read_config(vdev_t *vd, uint64_t txg)
int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL |
ZIO_FLAG_SPECULATIVE;
ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
ASSERT(vd->vdev_validate_thread == curthread ||
spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
if (!vdev_readable(vd))
return (NULL);