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* malloc/arena.c (grow_heap): Split out code to shrink heap into... 

(shrink_heap): ... this new function.
	(heap_trim): Call shrink_heap instead of grow_heap.
This commit is contained in:
Ulrich Drepper 2007-12-12 00:11:49 +00:00
parent 17edb30c62
commit cbf5760e62
2 changed files with 51 additions and 33 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2007-12-11 Ulrich Drepper <drepper@redhat.com> 2007-12-11 Ulrich Drepper <drepper@redhat.com>
* malloc/arena.c (grow_heap): Split out code to shrink heap into...
(shrink_heap): ... this new function.
(heap_trim): Call shrink_heap instead of grow_heap.
* malloc/malloc.c (_int_malloc): sYSMALLOc might fail, in this * malloc/malloc.c (_int_malloc): sYSMALLOc might fail, in this
case don't call alloc_perturb. case don't call alloc_perturb.

32
malloc/arena.c
View File

@ -704,8 +704,8 @@ new_heap(size, top_pad) size_t size, top_pad;
return h; return h;
} }
/* Grow or shrink a heap. size is automatically rounded up to a /* Grow a heap. size is automatically rounded up to a
multiple of the page size if it is positive. */ multiple of the page size. */
static int static int
#if __STD_C #if __STD_C
@ -717,7 +717,6 @@ grow_heap(h, diff) heap_info *h; long diff;
size_t page_mask = malloc_getpagesize - 1; size_t page_mask = malloc_getpagesize - 1;
long new_size; long new_size;
if(diff >= 0) {
diff = (diff + page_mask) & ~page_mask; diff = (diff + page_mask) & ~page_mask;
new_size = (long)h->size + diff; new_size = (long)h->size + diff;
if((unsigned long) new_size > (unsigned long) HEAP_MAX_SIZE) if((unsigned long) new_size > (unsigned long) HEAP_MAX_SIZE)
@ -729,8 +728,23 @@ grow_heap(h, diff) heap_info *h; long diff;
return -2; return -2;
h->mprotect_size = new_size; h->mprotect_size = new_size;
} }
} else {
new_size = (long)h->size + diff; h->size = new_size;
return 0;
}
/* Shrink a heap. */
static int
#if __STD_C
shrink_heap(heap_info *h, long diff)
#else
shrink_heap(h, diff) heap_info *h; long diff;
#endif
{
long new_size;
new_size = (long)h->size - diff;
if(new_size < (long)sizeof(*h)) if(new_size < (long)sizeof(*h))
return -1; return -1;
/* Try to re-map the extra heap space freshly to save memory, and /* Try to re-map the extra heap space freshly to save memory, and
@ -741,17 +755,17 @@ grow_heap(h, diff) heap_info *h; long diff;
if (1) if (1)
#endif #endif
{ {
if((char *)MMAP((char *)h + new_size, -diff, PROT_NONE, if((char *)MMAP((char *)h + new_size, diff, PROT_NONE,
MAP_PRIVATE|MAP_FIXED) == (char *) MAP_FAILED) MAP_PRIVATE|MAP_FIXED) == (char *) MAP_FAILED)
return -2; return -2;
h->mprotect_size = new_size; h->mprotect_size = new_size;
} }
#ifdef _LIBC #ifdef _LIBC
else else
madvise ((char *)h + new_size, -diff, MADV_DONTNEED); madvise ((char *)h + new_size, diff, MADV_DONTNEED);
#endif #endif
/*fprintf(stderr, "shrink %p %08lx\n", h, new_size);*/ /*fprintf(stderr, "shrink %p %08lx\n", h, new_size);*/
}
h->size = new_size; h->size = new_size;
return 0; return 0;
} }
@ -811,7 +825,7 @@ heap_trim(heap, pad) heap_info *heap; size_t pad;
if(extra < (long)pagesz) if(extra < (long)pagesz)
return 0; return 0;
/* Try to shrink. */ /* Try to shrink. */
if(grow_heap(heap, -extra) != 0) if(shrink_heap(heap, extra) != 0)
return 0; return 0;
ar_ptr->system_mem -= extra; ar_ptr->system_mem -= extra;
arena_mem -= extra; arena_mem -= extra;