project-base/server-skynet-source-3rd-jemalloc
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Fix two prof-related bugs in rallocm().

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Properly handle boundary conditions for sampled region promotion in
rallocm().  Prior to this fix, some combinations of 'size' and 'extra'
values could cause erroneous behavior.  Additionally, size class
recording for promoted regions was incorrect.
This commit is contained in:
Jason Evans 2011-08-11 22:51:00 -07:00
parent 0cdd42eb32
commit 183ba50c19
2 changed files with 11 additions and 3 deletions
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1
src/arena.c
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@ -1657,6 +1657,7 @@ arena_prof_promoted(const void *ptr, size_t size)
assert(ptr != NULL);
assert(CHUNK_ADDR2BASE(ptr) != ptr);
assert(isalloc(ptr) == PAGE_SIZE);
assert(size <= small_maxclass);
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> PAGE_SHIFT;

13
src/jemalloc.c
View File

@ -1670,15 +1670,22 @@ JEMALLOC_P(rallocm)(void **ptr, size_t *rsize, size_t size, size_t extra,
old_ctx = prof_ctx_get(p);
if ((cnt = prof_alloc_prep(max_usize)) == NULL)
goto OOM;
if (prof_promote && (uintptr_t)cnt != (uintptr_t)1U && max_usize
<= small_maxclass) {
/*
* Use minimum usize to determine whether promotion may happen.
*/
if (prof_promote && (uintptr_t)cnt != (uintptr_t)1U
&& ((alignment == 0) ? s2u(size) : sa2u(size,
alignment, NULL)) <= small_maxclass) {
q = iralloc(p, small_maxclass+1, (small_maxclass+1 >=
size+extra) ? 0 : size+extra - (small_maxclass+1),
alignment, zero, no_move);
if (q == NULL)
goto ERR;
usize = isalloc(q);
arena_prof_promoted(q, usize);
if (max_usize < PAGE_SIZE) {
usize = max_usize;
arena_prof_promoted(q, usize);
}
} else {
q = iralloc(p, size, extra, alignment, zero, no_move);
if (q == NULL)