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Fix an in-place growing large reallocation regression.

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Fix arena_ralloc_large_grow() to properly account for large_pad, so that
in-place large reallocation succeeds when possible, rather than always
failing.  This regression was introduced by
8a03cf039c (Implement cache index
randomization for large allocations.)
This commit is contained in:
Jason Evans 2015-08-06 23:34:12 -07:00
parent 67c46a9e53
commit 5716d97f75
1 changed files with 6 additions and 5 deletions
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11
src/arena.c
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@ -2441,7 +2441,7 @@ arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, void *ptr,
size_t oldsize, size_t size, size_t extra, bool zero)
{
size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
size_t npages = oldsize >> LG_PAGE;
size_t npages = (oldsize + large_pad) >> LG_PAGE;
size_t followsize;
size_t usize_min = s2u(size);
@ -2451,7 +2451,7 @@ arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, void *ptr,
/* Try to extend the run. */
assert(usize_min > oldsize);
malloc_mutex_lock(&arena->lock);
if (pageind + npages < chunk_npages &&
if (pageind+npages < chunk_npages &&
arena_mapbits_allocated_get(chunk, pageind+npages) == 0 &&
(followsize = arena_mapbits_unallocated_size_get(chunk,
pageind+npages)) >= usize_min - oldsize) {
@ -2467,13 +2467,13 @@ arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, void *ptr,
while (oldsize + followsize < usize)
usize = index2size(size2index(usize)-1);
assert(usize >= usize_min);
splitsize = usize - oldsize + large_pad;
splitsize = usize - oldsize;
run = &arena_miscelm_get(chunk, pageind+npages)->run;
arena_run_split_large(arena, run, splitsize, zero);
size = oldsize + splitsize;
npages = size >> LG_PAGE;
npages = (size + large_pad) >> LG_PAGE;
/*
* Mark the extended run as dirty if either portion of the run
@ -2485,7 +2485,8 @@ arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, void *ptr,
*/
flag_dirty = arena_mapbits_dirty_get(chunk, pageind) |
arena_mapbits_dirty_get(chunk, pageind+npages-1);
arena_mapbits_large_set(chunk, pageind, size, flag_dirty);
arena_mapbits_large_set(chunk, pageind, size + large_pad,
flag_dirty);
arena_mapbits_large_set(chunk, pageind+npages-1, 0, flag_dirty);
if (config_stats) {