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Emap: Move over metadata splitting logic.

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This commit is contained in:
David Goldblatt
2020-02-03 13:27:21 -08:00
committed by David Goldblatt
parent 44f5f53605
commit 7c7b702064
3 changed files with 79 additions and 35 deletions
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53
src/emap.c
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@@ -183,3 +183,56 @@ emap_deregister_interior(tsdn_t *tsdn, emap_t *emap, rtree_ctx_t *rtree_ctx,
LG_PAGE));
}
}
bool
emap_split_prepare(tsdn_t *tsdn, emap_t *emap, rtree_ctx_t *rtree_ctx,
emap_split_prepare_t *split_prepare, edata_t *edata, size_t size_a,
szind_t szind_a, bool slab_a, edata_t *trail, size_t size_b,
szind_t szind_b, bool slab_b, unsigned ind_b) {
/*
* Note that while the trail mostly inherits its attributes from the
* extent to be split, it maintains its own arena ind -- this allows
* cross-arena edata interactions, such as occur in the range ecache.
*/
edata_init(trail, ind_b,
(void *)((uintptr_t)edata_base_get(edata) + size_a), size_b,
slab_b, szind_b, edata_sn_get(edata), edata_state_get(edata),
edata_zeroed_get(edata), edata_committed_get(edata),
edata_dumpable_get(edata), EXTENT_NOT_HEAD);
/*
* We use incorrect constants for things like arena ind, zero, dump, and
* commit state, and head status. This is a fake edata_t, used to
* facilitate a lookup.
*/
edata_t lead;
edata_init(&lead, 0U, edata_addr_get(edata), size_a, slab_a, szind_a, 0,
extent_state_active, false, false, false, EXTENT_NOT_HEAD);
emap_rtree_leaf_elms_lookup(tsdn, emap, rtree_ctx, &lead, false, true,
&split_prepare->lead_elm_a, &split_prepare->lead_elm_b);
emap_rtree_leaf_elms_lookup(tsdn, emap, rtree_ctx, trail, false, true,
&split_prepare->trail_elm_a, &split_prepare->trail_elm_b);
if (split_prepare->lead_elm_a == NULL
|| split_prepare->lead_elm_b == NULL
|| split_prepare->trail_elm_a == NULL
|| split_prepare->trail_elm_b == NULL) {
return true;
}
return false;
}
void
emap_split_commit(tsdn_t *tsdn, emap_t *emap,
emap_split_prepare_t *split_prepare, edata_t *lead, size_t size_a,
szind_t szind_a, bool slab_a, edata_t *trail, size_t size_b,
szind_t szind_b, bool slab_b) {
edata_size_set(lead, size_a);
edata_szind_set(lead, szind_a);
emap_rtree_write_acquired(tsdn, emap, split_prepare->lead_elm_a,
split_prepare->lead_elm_b, lead, szind_a, slab_a);
emap_rtree_write_acquired(tsdn, emap, split_prepare->trail_elm_a,
split_prepare->trail_elm_b, trail, szind_b, slab_b);
}