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OpenZFS 7303 - dynamic metaslab selection
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
Brian Behlendorf
parent
5727b00e06
commit
4e21fd060a
@ -2643,10 +2643,21 @@ zdb_leak_init(spa_t *spa, zdb_cb_t *zcb)
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if (!dump_opt['L']) {
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vdev_t *rvd = spa->spa_root_vdev;
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/*
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* We are going to be changing the meaning of the metaslab's
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* ms_tree. Ensure that the allocator doesn't try to
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* use the tree.
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*/
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spa->spa_normal_class->mc_ops = &zdb_metaslab_ops;
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spa->spa_log_class->mc_ops = &zdb_metaslab_ops;
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for (c = 0; c < rvd->vdev_children; c++) {
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vdev_t *vd = rvd->vdev_child[c];
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metaslab_group_t *mg = vd->vdev_mg;
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for (m = 0; m < vd->vdev_ms_count; m++) {
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metaslab_t *msp = vd->vdev_ms[m];
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ASSERT3P(msp->ms_group, ==, mg);
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mutex_enter(&msp->ms_lock);
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metaslab_unload(msp);
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@ -2667,8 +2678,6 @@ zdb_leak_init(spa_t *spa, zdb_cb_t *zcb)
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(longlong_t)m,
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(longlong_t)vd->vdev_ms_count);
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msp->ms_ops = &zdb_metaslab_ops;
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/*
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* We don't want to spend the CPU
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* manipulating the size-ordered
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@ -2678,6 +2687,8 @@ zdb_leak_init(spa_t *spa, zdb_cb_t *zcb)
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msp->ms_tree->rt_ops = NULL;
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VERIFY0(space_map_load(msp->ms_sm,
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msp->ms_tree, SM_ALLOC));
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if (!msp->ms_loaded)
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msp->ms_loaded = B_TRUE;
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}
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mutex_exit(&msp->ms_lock);
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@ -2702,8 +2713,10 @@ zdb_leak_fini(spa_t *spa)
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vdev_t *rvd = spa->spa_root_vdev;
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for (c = 0; c < rvd->vdev_children; c++) {
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vdev_t *vd = rvd->vdev_child[c];
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metaslab_group_t *mg = vd->vdev_mg;
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for (m = 0; m < vd->vdev_ms_count; m++) {
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metaslab_t *msp = vd->vdev_ms[m];
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ASSERT3P(mg, ==, msp->ms_group);
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mutex_enter(&msp->ms_lock);
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/*
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@ -2717,6 +2730,8 @@ zdb_leak_fini(spa_t *spa)
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* from the ms_tree.
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*/
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range_tree_vacate(msp->ms_tree, zdb_leak, vd);
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if (msp->ms_loaded)
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msp->ms_loaded = B_FALSE;
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mutex_exit(&msp->ms_lock);
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@ -178,7 +178,7 @@ static const ztest_shared_opts_t ztest_opts_defaults = {
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.zo_mirrors = 2,
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.zo_raidz = 4,
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.zo_raidz_parity = 1,
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.zo_vdev_size = SPA_MINDEVSIZE * 2,
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.zo_vdev_size = SPA_MINDEVSIZE * 4, /* 256m default size */
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.zo_datasets = 7,
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.zo_threads = 23,
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.zo_passtime = 60, /* 60 seconds */
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@ -20,7 +20,7 @@
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011, 2015 by Delphix. All rights reserved.
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* Copyright (c) 2011, 2016 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_METASLAB_H
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@ -36,10 +36,12 @@
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extern "C" {
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#endif
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typedef struct metaslab_ops {
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uint64_t (*msop_alloc)(metaslab_t *msp, uint64_t size);
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uint64_t (*msop_alloc)(metaslab_t *, uint64_t);
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} metaslab_ops_t;
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extern metaslab_ops_t *zfs_metaslab_ops;
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int metaslab_init(metaslab_group_t *, uint64_t, uint64_t, uint64_t,
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@ -64,13 +66,18 @@ uint64_t metaslab_block_maxsize(metaslab_t *);
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#define METASLAB_FASTWRITE 0x20
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int metaslab_alloc(spa_t *, metaslab_class_t *, uint64_t,
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blkptr_t *, int, uint64_t, blkptr_t *, int, zio_t *);
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blkptr_t *, int, uint64_t, blkptr_t *, int, zio_alloc_list_t *, zio_t *);
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void metaslab_free(spa_t *, const blkptr_t *, uint64_t, boolean_t);
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int metaslab_claim(spa_t *, const blkptr_t *, uint64_t);
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void metaslab_check_free(spa_t *, const blkptr_t *);
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void metaslab_fastwrite_mark(spa_t *, const blkptr_t *);
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void metaslab_fastwrite_unmark(spa_t *, const blkptr_t *);
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void metaslab_alloc_trace_init(void);
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void metaslab_alloc_trace_fini(void);
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void metaslab_trace_init(zio_alloc_list_t *);
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void metaslab_trace_fini(zio_alloc_list_t *);
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metaslab_class_t *metaslab_class_create(spa_t *, metaslab_ops_t *);
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void metaslab_class_destroy(metaslab_class_t *);
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int metaslab_class_validate(metaslab_class_t *);
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@ -24,7 +24,7 @@
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*/
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/*
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* Copyright (c) 2011, 2015 by Delphix. All rights reserved.
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* Copyright (c) 2011, 2016 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_METASLAB_IMPL_H
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@ -41,6 +41,94 @@
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extern "C" {
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#endif
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/*
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* Metaslab allocation tracing record.
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*/
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typedef struct metaslab_alloc_trace {
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list_node_t mat_list_node;
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metaslab_group_t *mat_mg;
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metaslab_t *mat_msp;
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uint64_t mat_size;
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uint64_t mat_weight;
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uint32_t mat_dva_id;
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uint64_t mat_offset;
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} metaslab_alloc_trace_t;
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/*
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* Used by the metaslab allocation tracing facility to indicate
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* error conditions. These errors are stored to the offset member
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* of the metaslab_alloc_trace_t record and displayed by mdb.
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*/
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typedef enum trace_alloc_type {
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TRACE_ALLOC_FAILURE = -1ULL,
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TRACE_TOO_SMALL = -2ULL,
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TRACE_FORCE_GANG = -3ULL,
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TRACE_NOT_ALLOCATABLE = -4ULL,
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TRACE_GROUP_FAILURE = -5ULL,
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TRACE_ENOSPC = -6ULL,
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TRACE_CONDENSING = -7ULL,
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TRACE_VDEV_ERROR = -8ULL
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} trace_alloc_type_t;
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#define METASLAB_WEIGHT_PRIMARY (1ULL << 63)
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#define METASLAB_WEIGHT_SECONDARY (1ULL << 62)
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#define METASLAB_WEIGHT_TYPE (1ULL << 61)
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#define METASLAB_ACTIVE_MASK \
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(METASLAB_WEIGHT_PRIMARY | METASLAB_WEIGHT_SECONDARY)
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/*
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* The metaslab weight is used to encode the amount of free space in a
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* metaslab, such that the "best" metaslab appears first when sorting the
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* metaslabs by weight. The weight (and therefore the "best" metaslab) can
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* be determined in two different ways: by computing a weighted sum of all
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* the free space in the metaslab (a space based weight) or by counting only
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* the free segments of the largest size (a segment based weight). We prefer
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* the segment based weight because it reflects how the free space is
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* comprised, but we cannot always use it -- legacy pools do not have the
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* space map histogram information necessary to determine the largest
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* contiguous regions. Pools that have the space map histogram determine
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* the segment weight by looking at each bucket in the histogram and
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* determining the free space whose size in bytes is in the range:
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* [2^i, 2^(i+1))
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* We then encode the largest index, i, that contains regions into the
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* segment-weighted value.
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*
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* Space-based weight:
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*
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* 64 56 48 40 32 24 16 8 0
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* |PS1| weighted-free space |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*
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* PS - indicates primary and secondary activation
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* space - the fragmentation-weighted space
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*
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* Segment-based weight:
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*
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* 64 56 48 40 32 24 16 8 0
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* |PS0| idx| count of segments in region |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*
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* PS - indicates primary and secondary activation
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* idx - index for the highest bucket in the histogram
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* count - number of segments in the specified bucket
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*/
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#define WEIGHT_GET_ACTIVE(weight) BF64_GET((weight), 62, 2)
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#define WEIGHT_SET_ACTIVE(weight, x) BF64_SET((weight), 62, 2, x)
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#define WEIGHT_IS_SPACEBASED(weight) \
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((weight) == 0 || BF64_GET((weight), 61, 1))
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#define WEIGHT_SET_SPACEBASED(weight) BF64_SET((weight), 61, 1, 1)
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/*
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* These macros are only applicable to segment-based weighting.
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*/
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#define WEIGHT_GET_INDEX(weight) BF64_GET((weight), 55, 6)
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#define WEIGHT_SET_INDEX(weight, x) BF64_SET((weight), 55, 6, x)
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#define WEIGHT_GET_COUNT(weight) BF64_GET((weight), 0, 55)
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#define WEIGHT_SET_COUNT(weight, x) BF64_SET((weight), 0, 55, x)
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/*
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* A metaslab class encompasses a category of allocatable top-level vdevs.
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* Each top-level vdev is associated with a metaslab group which defines
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@ -220,7 +308,6 @@ struct metaslab {
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kmutex_t ms_lock;
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kcondvar_t ms_load_cv;
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space_map_t *ms_sm;
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metaslab_ops_t *ms_ops;
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uint64_t ms_id;
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uint64_t ms_start;
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uint64_t ms_size;
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@ -233,12 +320,27 @@ struct metaslab {
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boolean_t ms_condensing; /* condensing? */
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boolean_t ms_condense_wanted;
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/*
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* We must hold both ms_lock and ms_group->mg_lock in order to
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* modify ms_loaded.
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*/
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boolean_t ms_loaded;
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boolean_t ms_loading;
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int64_t ms_deferspace; /* sum of ms_defermap[] space */
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uint64_t ms_weight; /* weight vs. others in group */
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uint64_t ms_access_txg;
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uint64_t ms_activation_weight; /* activation weight */
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/*
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* Track of whenever a metaslab is selected for loading or allocation.
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* We use this value to determine how long the metaslab should
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* stay cached.
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*/
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uint64_t ms_selected_txg;
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uint64_t ms_alloc_txg; /* last successful alloc (debug only) */
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uint64_t ms_max_size; /* maximum allocatable size */
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/*
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* The metaslab block allocators can optionally use a size-ordered
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@ -394,6 +394,7 @@ extern void cv_broadcast(kcondvar_t *cv);
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*/
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extern kstat_t *kstat_create(const char *, int,
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const char *, const char *, uchar_t, ulong_t, uchar_t);
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extern void kstat_named_init(kstat_named_t *, const char *, uchar_t);
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extern void kstat_install(kstat_t *);
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extern void kstat_delete(kstat_t *);
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extern void kstat_waitq_enter(kstat_io_t *);
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@ -42,14 +42,15 @@ extern int zfs_flags;
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extern int zfs_recover;
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extern int zfs_free_leak_on_eio;
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#define ZFS_DEBUG_DPRINTF (1<<0)
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#define ZFS_DEBUG_DBUF_VERIFY (1<<1)
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#define ZFS_DEBUG_DNODE_VERIFY (1<<2)
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#define ZFS_DEBUG_SNAPNAMES (1<<3)
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#define ZFS_DEBUG_MODIFY (1<<4)
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#define ZFS_DEBUG_SPA (1<<5)
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#define ZFS_DEBUG_ZIO_FREE (1<<6)
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#define ZFS_DEBUG_HISTOGRAM_VERIFY (1<<7)
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#define ZFS_DEBUG_DPRINTF (1 << 0)
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#define ZFS_DEBUG_DBUF_VERIFY (1 << 1)
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#define ZFS_DEBUG_DNODE_VERIFY (1 << 2)
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#define ZFS_DEBUG_SNAPNAMES (1 << 3)
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#define ZFS_DEBUG_MODIFY (1 << 4)
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#define ZFS_DEBUG_SPA (1 << 5)
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#define ZFS_DEBUG_ZIO_FREE (1 << 6)
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#define ZFS_DEBUG_HISTOGRAM_VERIFY (1 << 7)
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#define ZFS_DEBUG_METASLAB_VERIFY (1 << 8)
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extern void __dprintf(const char *file, const char *func,
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int line, const char *fmt, ...);
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@ -358,6 +358,11 @@ typedef int zio_pipe_stage_t(zio_t *zio);
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#define ZIO_REEXECUTE_NOW 0x01
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#define ZIO_REEXECUTE_SUSPEND 0x02
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typedef struct zio_alloc_list {
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list_t zal_list;
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uint64_t zal_size;
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} zio_alloc_list_t;
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typedef struct zio_link {
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zio_t *zl_parent;
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zio_t *zl_child;
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@ -417,6 +422,7 @@ struct zio {
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avl_node_t io_queue_node;
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avl_node_t io_offset_node;
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avl_node_t io_alloc_node;
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zio_alloc_list_t io_alloc_list;
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/* Internal pipeline state */
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enum zio_flag io_flags;
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@ -179,6 +179,30 @@ relative to the pool.
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Use \fB1\fR for yes (default) and \fB0\fR for no.
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.RE
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.sp
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.ne 2
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.na
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\fBzfs_metaslab_segment_weight_enabled\fR (int)
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.ad
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.RS 12n
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Enable/disable segment-based metaslab selection.
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.sp
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Use \fB1\fR for yes (default) and \fB0\fR for no.
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.RE
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.sp
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.ne 2
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.na
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\fBzfs_metaslab_switch_threshold\fR (int)
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.ad
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.RS 12n
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When using segment-based metaslab selection, continue allocating
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from the active metaslab until \fBlzfs_metaslab_switch_threshold\fR
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worth of buckets have been exhausted.
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.sp
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Default value: \fB2\fR.
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.RE
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.sp
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.ne 2
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.na
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File diff suppressed because it is too large
Load Diff
@ -1313,7 +1313,7 @@ spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent,
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static void
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spa_unload(spa_t *spa)
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{
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int i;
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int i, c;
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ASSERT(MUTEX_HELD(&spa_namespace_lock));
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@ -1330,6 +1330,19 @@ spa_unload(spa_t *spa)
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spa->spa_sync_on = B_FALSE;
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}
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/*
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* Even though vdev_free() also calls vdev_metaslab_fini, we need
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* to call it earlier, before we wait for async i/o to complete.
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* This ensures that there is no async metaslab prefetching, by
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* calling taskq_wait(mg_taskq).
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*/
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if (spa->spa_root_vdev != NULL) {
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spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER);
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for (c = 0; c < spa->spa_root_vdev->vdev_children; c++)
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vdev_metaslab_fini(spa->spa_root_vdev->vdev_child[c]);
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spa_config_exit(spa, SCL_ALL, FTAG);
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}
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/*
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* Wait for any outstanding async I/O to complete.
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*/
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@ -1833,6 +1833,7 @@ spa_init(int mode)
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refcount_init();
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unique_init();
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range_tree_init();
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metaslab_alloc_trace_init();
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ddt_init();
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zio_init();
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dmu_init();
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@ -1861,6 +1862,7 @@ spa_fini(void)
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dmu_fini();
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zio_fini();
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ddt_fini();
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metaslab_alloc_trace_fini();
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range_tree_fini();
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unique_fini();
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refcount_fini();
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@ -173,7 +173,6 @@ space_map_histogram_add(space_map_t *sm, range_tree_t *rt, dmu_tx_t *tx)
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dmu_buf_will_dirty(sm->sm_dbuf, tx);
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ASSERT(space_map_histogram_verify(sm, rt));
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/*
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* Transfer the content of the range tree histogram to the space
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* map histogram. The space map histogram contains 32 buckets ranging
|
||||
|
||||
@ -596,6 +596,7 @@ zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp,
|
||||
offsetof(zio_link_t, zl_parent_node));
|
||||
list_create(&zio->io_child_list, sizeof (zio_link_t),
|
||||
offsetof(zio_link_t, zl_child_node));
|
||||
metaslab_trace_init(&zio->io_alloc_list);
|
||||
|
||||
if (vd != NULL)
|
||||
zio->io_child_type = ZIO_CHILD_VDEV;
|
||||
@ -657,6 +658,7 @@ zio_create(zio_t *pio, spa_t *spa, uint64_t txg, const blkptr_t *bp,
|
||||
static void
|
||||
zio_destroy(zio_t *zio)
|
||||
{
|
||||
metaslab_trace_fini(&zio->io_alloc_list);
|
||||
list_destroy(&zio->io_parent_list);
|
||||
list_destroy(&zio->io_child_list);
|
||||
mutex_destroy(&zio->io_lock);
|
||||
@ -2299,7 +2301,8 @@ zio_write_gang_block(zio_t *pio)
|
||||
}
|
||||
|
||||
error = metaslab_alloc(spa, mc, SPA_GANGBLOCKSIZE,
|
||||
bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, flags, pio);
|
||||
bp, gbh_copies, txg, pio == gio ? NULL : gio->io_bp, flags,
|
||||
&pio->io_alloc_list, pio);
|
||||
if (error) {
|
||||
if (pio->io_flags & ZIO_FLAG_IO_ALLOCATING) {
|
||||
ASSERT(pio->io_priority == ZIO_PRIORITY_ASYNC_WRITE);
|
||||
@ -3011,7 +3014,8 @@ zio_dva_allocate(zio_t *zio)
|
||||
flags |= METASLAB_ASYNC_ALLOC;
|
||||
|
||||
error = metaslab_alloc(spa, mc, zio->io_size, bp,
|
||||
zio->io_prop.zp_copies, zio->io_txg, NULL, flags, zio);
|
||||
zio->io_prop.zp_copies, zio->io_txg, NULL, flags,
|
||||
&zio->io_alloc_list, zio);
|
||||
|
||||
if (error != 0) {
|
||||
spa_dbgmsg(spa, "%s: metaslab allocation failure: zio %p, "
|
||||
@ -3077,18 +3081,24 @@ zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, uint64_t size,
|
||||
boolean_t use_slog)
|
||||
{
|
||||
int error = 1;
|
||||
zio_alloc_list_t io_alloc_list;
|
||||
|
||||
ASSERT(txg > spa_syncing_txg(spa));
|
||||
|
||||
metaslab_trace_init(&io_alloc_list);
|
||||
|
||||
if (use_slog) {
|
||||
error = metaslab_alloc(spa, spa_log_class(spa), size,
|
||||
new_bp, 1, txg, NULL, METASLAB_FASTWRITE, NULL);
|
||||
new_bp, 1, txg, NULL, METASLAB_FASTWRITE,
|
||||
&io_alloc_list, NULL);
|
||||
}
|
||||
|
||||
if (error) {
|
||||
error = metaslab_alloc(spa, spa_normal_class(spa), size,
|
||||
new_bp, 1, txg, NULL, METASLAB_FASTWRITE, NULL);
|
||||
new_bp, 1, txg, NULL, METASLAB_FASTWRITE,
|
||||
&io_alloc_list, NULL);
|
||||
}
|
||||
metaslab_trace_fini(&io_alloc_list);
|
||||
|
||||
if (error == 0) {
|
||||
BP_SET_LSIZE(new_bp, size);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user