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Document some of the internal extent functions.

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David Goldblatt 2017-08-28 18:27:12 -07:00 committed by David Goldblatt
parent 33df2fa169
commit 5bad01c38e
1 changed files with 35 additions and 0 deletions
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35
src/extent.c
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@ -723,6 +723,13 @@ extent_reregister(tsdn_t *tsdn, extent_t *extent) {
assert(!err);
}
/*
* Removes all pointers to the given extent from the global rtree indices for
* its interior. This is relevant for slab extents, for which we need to do
* metadata lookups at places other than the head of the extent. We deregister
* on the interior, then, when an extent moves from being an active slab to an
* inactive state.
*/
static void
extent_interior_deregister(tsdn_t *tsdn, rtree_ctx_t *rtree_ctx,
extent_t *extent) {
@ -737,6 +744,9 @@ extent_interior_deregister(tsdn_t *tsdn, rtree_ctx_t *rtree_ctx,
}
}
/*
* Removes all pointers to the given extent from the global rtree.
*/
static void
extent_deregister(tsdn_t *tsdn, extent_t *extent) {
rtree_ctx_t rtree_ctx_fallback;
@ -760,6 +770,10 @@ extent_deregister(tsdn_t *tsdn, extent_t *extent) {
}
}
/*
* Tries to find and remove an extent from extents that can be used for the
* given allocation request.
*/
static extent_t *
extent_recycle_extract(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, rtree_ctx_t *rtree_ctx, extents_t *extents,
@ -832,6 +846,12 @@ extent_recycle_extract(tsdn_t *tsdn, arena_t *arena,
return extent;
}
/*
* This fulfills the indicated allocation request out of the given extent (which
* the caller should have ensured was big enough). If there's any unused space
* before or after the resulting allocation, that space is given its own extent
* and put back into extents.
*/
static extent_t *
extent_recycle_split(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, rtree_ctx_t *rtree_ctx, extents_t *extents,
@ -892,6 +912,10 @@ extent_recycle_split(tsdn_t *tsdn, arena_t *arena,
return extent;
}
/*
* Tries to satisfy the given allocation request by reusing one of the extents
* in the given extents_t.
*/
static extent_t *
extent_recycle(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
extents_t *extents, void *new_addr, size_t size, size_t pad,
@ -1442,6 +1466,10 @@ extent_try_coalesce(tsdn_t *tsdn, arena_t *arena,
return extent;
}
/*
* Does the metadata management portions of putting an unused extent into the
* given extents_t (coalesces, deregisters slab interiors, the heap operations).
*/
static void
extent_record(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
extents_t *extents, extent_t *extent, bool growing_retained) {
@ -1800,6 +1828,13 @@ extent_split_default(extent_hooks_t *extent_hooks, void *addr, size_t size,
}
#endif
/*
* Accepts the extent to split, and the characteristics of each side of the
* split. The 'a' parameters go with the 'lead' of the resulting pair of
* extents (the lower addressed portion of the split), and the 'b' parameters go
* with the trail (the higher addressed portion). This makes 'extent' the lead,
* and returns the trail (except in case of error).
*/
static extent_t *
extent_split_impl(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, extent_t *extent, size_t size_a,