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OpenZFS 7303 - dynamic metaslab selection

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This change introduces a new weighting algorithm to improve
metaslab selection. The new weighting algorithm relies on the
SPACEMAP_HISTOGRAM feature. As a result, the metaslab weight
now encodes the type of weighting algorithm used (size-based
vs segment-based).

Porting Notes: The metaslab allocation tracing code is conditionally
removed on linux (dependent on mdb debugger).

Authored by: George Wilson <george.wilson@delphix.com>
Reviewed by: Alex Reece <alex@delphix.com>
Reviewed by: Chris Siden <christopher.siden@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <paul.dagnelie@delphix.com>
Reviewed by: Pavel Zakharov pavel.zakharov@delphix.com
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Don Brady <don.brady@intel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: Don Brady <don.brady@intel.com>

OpenZFS-issue: https://www.illumos.org/issues/7303
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/d5190931bd
Closes #5404
This commit is contained in:
Don Brady
2017-01-12 12:52:56 -07:00
committed by Brian Behlendorf
parent 5727b00e06
commit 4e21fd060a
13 changed files with 1042 additions and 226 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/spa.c
+14 -1
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@@ -1313,7 +1313,7 @@ spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent,
static void
spa_unload(spa_t *spa)
{
int i;
int i, c;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
@@ -1330,6 +1330,19 @@ spa_unload(spa_t *spa)
spa->spa_sync_on = B_FALSE;
}
/*
* Even though vdev_free() also calls vdev_metaslab_fini, we need
* to call it earlier, before we wait for async i/o to complete.
* This ensures that there is no async metaslab prefetching, by
* calling taskq_wait(mg_taskq).
*/
if (spa->spa_root_vdev != NULL) {
spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
for (c = 0; c < spa->spa_root_vdev->vdev_children; c++)
vdev_metaslab_fini(spa->spa_root_vdev->vdev_child[c]);
spa_config_exit(spa, SCL_ALL, FTAG);
}
/*
* Wait for any outstanding async I/O to complete.
*/