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Refactor purging and splitting/merging.

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Split purging into lazy and forced variants.  Use the forced variant for
zeroing dss.

Add support for NULL function pointers as an opt-out mechanism for the
dalloc, commit, decommit, purge_lazy, purge_forced, split, and merge
fields of extent_hooks_t.

Add short-circuiting checks in large_ralloc_no_move_{shrink,expand}() so
that no attempt is made if splitting/merging is not supported.

This resolves #268.
This commit is contained in:
Jason Evans 2016-12-03 15:38:25 -08:00
parent 884fa22b8c
commit a6e86810d8
11 changed files with 258 additions and 84 deletions
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6
src/large.c
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@ -110,6 +110,9 @@ large_ralloc_no_move_shrink(tsdn_t *tsdn, extent_t *extent, size_t usize)
assert(oldusize > usize);
if (extent_hooks->split == NULL)
return (true);
/* Split excess pages. */
if (diff != 0) {
extent_t *trail = extent_split_wrapper(tsdn, arena,
@ -142,6 +145,9 @@ large_ralloc_no_move_expand(tsdn_t *tsdn, extent_t *extent, size_t usize,
size_t trailsize = usize - extent_usize_get(extent);
extent_t *trail;
if (extent_hooks->merge == NULL)
return (true);
if ((trail = arena_extent_cache_alloc(tsdn, arena, &extent_hooks,
extent_past_get(extent), trailsize, CACHELINE, &is_zeroed_trail)) ==
NULL) {