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Add single-threaded path to _int_malloc

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This patch adds single-threaded fast paths to _int_malloc.

	* malloc/malloc.c (_int_malloc): Add SINGLE_THREAD_P path.

(cherry-picked 905a7725e9)
This commit is contained in:
Wilco Dijkstra 2017-11-28 19:16:19 +05:30 committed by Siddhesh Poyarekar
parent 3664f34346
commit f312f235d5
2 changed files with 42 additions and 25 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2017-10-23 Wilco Dijkstra <wdijkstr@arm.com>
* malloc/malloc.c (_int_malloc): Add SINGLE_THREAD_P path.
2017-10-23 Wilco Dijkstra <wdijkstr@arm.com>
* malloc/malloc.c (__libc_malloc): Add SINGLE_THREAD_P path.

63
malloc/malloc.c
View File

@ -3575,37 +3575,50 @@ _int_malloc (mstate av, size_t bytes)
{
idx = fastbin_index (nb);
mfastbinptr *fb = &fastbin (av, idx);
mchunkptr pp = *fb;
REMOVE_FB (fb, victim, pp);
if (victim != 0)
{
if (__builtin_expect (fastbin_index (chunksize (victim)) != idx, 0))
malloc_printerr ("malloc(): memory corruption (fast)");
check_remalloced_chunk (av, victim, nb);
#if USE_TCACHE
/* While we're here, if we see other chunks of the same size,
stash them in the tcache. */
size_t tc_idx = csize2tidx (nb);
if (tcache && tc_idx < mp_.tcache_bins)
{
mchunkptr tc_victim;
mchunkptr pp;
victim = *fb;
/* While bin not empty and tcache not full, copy chunks over. */
while (tcache->counts[tc_idx] < mp_.tcache_count
&& (pp = *fb) != NULL)
if (victim != NULL)
{
if (SINGLE_THREAD_P)
*fb = victim->fd;
else
REMOVE_FB (fb, pp, victim);
if (__glibc_likely (victim != NULL))
{
size_t victim_idx = fastbin_index (chunksize (victim));
if (__builtin_expect (victim_idx != idx, 0))
malloc_printerr ("malloc(): memory corruption (fast)");
check_remalloced_chunk (av, victim, nb);
#if USE_TCACHE
/* While we're here, if we see other chunks of the same size,
stash them in the tcache. */
size_t tc_idx = csize2tidx (nb);
if (tcache && tc_idx < mp_.tcache_bins)
{
REMOVE_FB (fb, tc_victim, pp);
if (tc_victim != 0)
mchunkptr tc_victim;
/* While bin not empty and tcache not full, copy chunks. */
while (tcache->counts[tc_idx] < mp_.tcache_count
&& (tc_victim = *fb) != NULL)
{
if (SINGLE_THREAD_P)
*fb = tc_victim->fd;
else
{
REMOVE_FB (fb, pp, tc_victim);
if (__glibc_unlikely (tc_victim == NULL))
break;
}
tcache_put (tc_victim, tc_idx);
}
}
}
}
#endif
void *p = chunk2mem (victim);
alloc_perturb (p, bytes);
return p;
}
void *p = chunk2mem (victim);
alloc_perturb (p, bytes);
return p;
}
}
}
/*