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Illumos 5243 - zdb -b could be much faster

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5243 zdb -b could be much faster
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Richard Elling <richard.elling@gmail.com>
Approved by: Dan McDonald <danmcd@omniti.com>

References:
  https://www.illumos.org/issues/5243
  https://github.com/illumos/illumos-gate/commit/f7950bf

Ported-by: Don Brady <don.brady@intel.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3414
This commit is contained in:
Matthew Ahrens
2015-05-14 17:41:29 -06:00
committed by Brian Behlendorf
parent b1b85c8772
commit e5fd1dd682
2 changed files with 47 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cmd/zdb/zdb.c
+25 -2
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@@ -76,9 +76,11 @@
#ifndef lint
extern int zfs_recover;
extern uint64_t zfs_arc_max, zfs_arc_meta_limit;
extern int zfs_vdev_async_read_max_active;
#else
int zfs_recover;
uint64_t zfs_arc_max, zfs_arc_meta_limit;
int zfs_vdev_async_read_max_active;
#endif
const char cmdname[] = "zdb";
@@ -2513,8 +2515,14 @@ zdb_blkptr_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
zcb->zcb_readfails = 0;
if (dump_opt['b'] < 5 &&
gethrtime() > zcb->zcb_lastprint + NANOSEC) {
/* only call gethrtime() every 100 blocks */
static int iters;
if (++iters > 100)
iters = 0;
else
return (0);
if (dump_opt['b'] < 5 && gethrtime() > zcb->zcb_lastprint + NANOSEC) {
uint64_t now = gethrtime();
char buf[10];
uint64_t bytes = zcb->zcb_type[ZB_TOTAL][ZDB_OT_TOTAL].zb_asize;
@@ -2625,6 +2633,14 @@ zdb_leak_init(spa_t *spa, zdb_cb_t *zcb)
(longlong_t)vd->vdev_ms_count);
msp->ms_ops = &zdb_metaslab_ops;
/*
* We don't want to spend the CPU
* manipulating the size-ordered
* tree, so clear the range_tree
* ops.
*/
msp->ms_tree->rt_ops = NULL;
VERIFY0(space_map_load(msp->ms_sm,
msp->ms_tree, SM_ALLOC));
msp->ms_loaded = B_TRUE;
@@ -3675,6 +3691,13 @@ main(int argc, char **argv)
zfs_arc_max = zfs_arc_meta_limit = 256 * 1024 * 1024;
#endif
/*
* "zdb -c" uses checksum-verifying scrub i/os which are async reads.
* "zdb -b" uses traversal prefetch which uses async reads.
* For good performance, let several of them be active at once.
*/
zfs_vdev_async_read_max_active = 10;
kernel_init(FREAD);
if ((g_zfs = libzfs_init()) == NULL)
return (1);