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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
cmd/zdb/zdb.c
+19 -4
View File
@@ -2643,10 +2643,21 @@ zdb_leak_init(spa_t *spa, zdb_cb_t *zcb)
if (!dump_opt['L']) {
vdev_t *rvd = spa->spa_root_vdev;
/*
* We are going to be changing the meaning of the metaslab's
* ms_tree. Ensure that the allocator doesn't try to
* use the tree.
*/
spa->spa_normal_class->mc_ops = &zdb_metaslab_ops;
spa->spa_log_class->mc_ops = &zdb_metaslab_ops;
for (c = 0; c < rvd->vdev_children; c++) {
vdev_t *vd = rvd->vdev_child[c];
metaslab_group_t *mg = vd->vdev_mg;
for (m = 0; m < vd->vdev_ms_count; m++) {
metaslab_t *msp = vd->vdev_ms[m];
ASSERT3P(msp->ms_group, ==, mg);
mutex_enter(&msp->ms_lock);
metaslab_unload(msp);
@@ -2667,8 +2678,6 @@ zdb_leak_init(spa_t *spa, zdb_cb_t *zcb)
(longlong_t)m,
(longlong_t)vd->vdev_ms_count);
msp->ms_ops = &zdb_metaslab_ops;
/*
* We don't want to spend the CPU
* manipulating the size-ordered
@@ -2678,7 +2687,9 @@ zdb_leak_init(spa_t *spa, zdb_cb_t *zcb)
msp->ms_tree->rt_ops = NULL;
VERIFY0(space_map_load(msp->ms_sm,
msp->ms_tree, SM_ALLOC));
msp->ms_loaded = B_TRUE;
if (!msp->ms_loaded)
msp->ms_loaded = B_TRUE;
}
mutex_exit(&msp->ms_lock);
}
@@ -2702,8 +2713,10 @@ zdb_leak_fini(spa_t *spa)
vdev_t *rvd = spa->spa_root_vdev;
for (c = 0; c < rvd->vdev_children; c++) {
vdev_t *vd = rvd->vdev_child[c];
metaslab_group_t *mg = vd->vdev_mg;
for (m = 0; m < vd->vdev_ms_count; m++) {
metaslab_t *msp = vd->vdev_ms[m];
ASSERT3P(mg, ==, msp->ms_group);
mutex_enter(&msp->ms_lock);
/*
@@ -2717,7 +2730,9 @@ zdb_leak_fini(spa_t *spa)
* from the ms_tree.
*/
range_tree_vacate(msp->ms_tree, zdb_leak, vd);
msp->ms_loaded = B_FALSE;
if (msp->ms_loaded)
msp->ms_loaded = B_FALSE;
mutex_exit(&msp->ms_lock);
}