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Fix tcache bin stack alignment.

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Set the proper alignment when allocating space for the tcache bin stack.
This commit is contained in:
Qi Wang 2019-08-23 16:06:50 -07:00 committed by Qi Wang
parent b7c7df24ba
commit ac5185f73e
1 changed files with 18 additions and 11 deletions
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29
src/tcache.c
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@ -492,8 +492,16 @@ tcache_init(tsd_t *tsd, tcache_t *tcache, void *avail_stack) {
static size_t
tcache_bin_stack_alignment (size_t size) {
/*
* 1) Align to at least PAGE, to minimize the # of TLBs needed by the
* smaller sizes; also helps if the larger sizes don't get used at all.
* 2) On 32-bit the pointers won't be compressed; use minimal alignment.
*/
if (LG_SIZEOF_PTR < 3 || size < PAGE) {
return PAGE;
}
/* Align pow2 to avoid overflow the cache bin compressed pointers. */
return (LG_SIZEOF_PTR == 3) ? pow2_ceil_zu(size) : CACHELINE;
return pow2_ceil_zu(size);
}
/* Initialize auto tcache (embedded in TSD). */
@ -501,11 +509,11 @@ bool
tsd_tcache_data_init(tsd_t *tsd) {
tcache_t *tcache = tsd_tcachep_get_unsafe(tsd);
assert(tcache_small_bin_get(tcache, 0)->cur_ptr.ptr == NULL);
/* Avoid false cacheline sharing. */
size_t size = sz_sa2u(total_stack_bytes, CACHELINE);
void *avail_array = ipallocztm(tsd_tsdn(tsd), size,
tcache_bin_stack_alignment(size), true, NULL, true,
arena_get(TSDN_NULL, 0, true));
size_t alignment = tcache_bin_stack_alignment(total_stack_bytes);
size_t size = sz_sa2u(total_stack_bytes, alignment);
void *avail_array = ipallocztm(tsd_tsdn(tsd), size, alignment, true,
NULL, true, arena_get(TSDN_NULL, 0, true));
if (avail_array == NULL) {
return true;
}
@ -545,12 +553,11 @@ tcache_create_explicit(tsd_t *tsd) {
size = PTR_CEILING(size);
size_t stack_offset = size;
size += total_stack_bytes;
/* Avoid false cacheline sharing. */
size = sz_sa2u(size, CACHELINE);
size_t alignment = tcache_bin_stack_alignment(size);
size = sz_sa2u(size, alignment);
tcache_t *tcache = ipallocztm(tsd_tsdn(tsd), size,
tcache_bin_stack_alignment(size), true, NULL, true,
arena_get(TSDN_NULL, 0, true));
tcache_t *tcache = ipallocztm(tsd_tsdn(tsd), size, alignment, true,
NULL, true, arena_get(TSDN_NULL, 0, true));
if (tcache == NULL) {
return NULL;
}