Mercurial > illumos > illumos-gate
changeset 13966:0e1d84ebb004
3578 transferring the freed map to the defer map should be constant time
3579 ztest trips assertion in metaslab_weight()
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Richard Elling <richard.elling@dey-sys.com>
Approved by: Dan McDonald <danmcd@nexenta.com>
| author | George Wilson <george.wilson@delphix.com> |
|---|---|
| date | Wed, 20 Feb 2013 13:30:36 -0800 |
| parents | 74a52e9ca211 |
| children | 92bec6d87f59 |
| files | usr/src/uts/common/fs/zfs/metaslab.c |
| diffstat | 1 files changed, 27 insertions(+), 11 deletions(-) [+] |
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--- a/usr/src/uts/common/fs/zfs/metaslab.c Tue Feb 19 15:34:49 2013 -0500 +++ b/usr/src/uts/common/fs/zfs/metaslab.c Wed Feb 20 13:30:36 2013 -0800 @@ -814,6 +814,16 @@ ASSERT(MUTEX_HELD(&msp->ms_lock)); /* + * This vdev is in the process of being removed so there is nothing + * for us to do here. + */ + if (vd->vdev_removing) { + ASSERT0(smo->smo_alloc); + ASSERT0(vd->vdev_ms_shift); + return (0); + } + + /* * The baseline weight is the metaslab's free space. */ space = sm->sm_size - smo->smo_alloc; @@ -1193,8 +1203,8 @@ space_map_obj_t *smo = &msp->ms_smo; space_map_obj_t *smosync = &msp->ms_smo_syncing; space_map_t *sm = msp->ms_map; - space_map_t *freed_map = msp->ms_freemap[TXG_CLEAN(txg) & TXG_MASK]; - space_map_t *defer_map = msp->ms_defermap[txg % TXG_DEFER_SIZE]; + space_map_t **freed_map = &msp->ms_freemap[TXG_CLEAN(txg) & TXG_MASK]; + space_map_t **defer_map = &msp->ms_defermap[txg % TXG_DEFER_SIZE]; metaslab_group_t *mg = msp->ms_group; vdev_t *vd = mg->mg_vd; int64_t alloc_delta, defer_delta; @@ -1207,8 +1217,8 @@ * If this metaslab is just becoming available, initialize its * allocmaps, freemaps, and defermap and add its capacity to the vdev. */ - if (freed_map == NULL) { - ASSERT(defer_map == NULL); + if (*freed_map == NULL) { + ASSERT(*defer_map == NULL); for (int t = 0; t < TXG_SIZE; t++) { msp->ms_allocmap[t] = kmem_zalloc(sizeof (space_map_t), KM_SLEEP); @@ -1227,14 +1237,14 @@ sm->sm_size, sm->sm_shift, sm->sm_lock); } - freed_map = msp->ms_freemap[TXG_CLEAN(txg) & TXG_MASK]; - defer_map = msp->ms_defermap[txg % TXG_DEFER_SIZE]; + freed_map = &msp->ms_freemap[TXG_CLEAN(txg) & TXG_MASK]; + defer_map = &msp->ms_defermap[txg % TXG_DEFER_SIZE]; vdev_space_update(vd, 0, 0, sm->sm_size); } alloc_delta = smosync->smo_alloc - smo->smo_alloc; - defer_delta = freed_map->sm_space - defer_map->sm_space; + defer_delta = (*freed_map)->sm_space - (*defer_map)->sm_space; vdev_space_update(vd, alloc_delta + defer_delta, defer_delta, 0); @@ -1244,12 +1254,18 @@ /* * If there's a space_map_load() in progress, wait for it to complete * so that we have a consistent view of the in-core space map. - * Then, add defer_map (oldest deferred frees) to this map and - * transfer freed_map (this txg's frees) to defer_map. */ space_map_load_wait(sm); - space_map_vacate(defer_map, sm->sm_loaded ? space_map_free : NULL, sm); - space_map_vacate(freed_map, space_map_add, defer_map); + + /* + * Move the frees from the defer_map to this map (if it's loaded). + * Swap the freed_map and the defer_map -- this is safe to do + * because we've just emptied out the defer_map. + */ + space_map_vacate(*defer_map, sm->sm_loaded ? space_map_free : NULL, sm); + ASSERT0((*defer_map)->sm_space); + ASSERT0(avl_numnodes(&(*defer_map)->sm_root)); + space_map_swap(freed_map, defer_map); *smo = *smosync;