diff options
Diffstat (limited to 'malloc/malloc.c')
| -rw-r--r-- | malloc/malloc.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index 21cb9d98d9..8eed746fff 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -1872,8 +1872,6 @@ mmap_chunk(size) size_t size; size_t page_mask = malloc_getpagesize - 1; mchunkptr p; - if(n_mmaps >= n_mmaps_max) return 0; /* too many regions */ - /* For mmapped chunks, the overhead is one SIZE_SZ unit larger, because * there is no following chunk whose prev_size field could be used. */ @@ -2930,8 +2928,10 @@ chunk_alloc(ar_ptr, nb) arena *ar_ptr; INTERNAL_SIZE_T nb; { #if HAVE_MMAP - /* If big and would otherwise need to extend, try to use mmap instead */ + /* If the request is big and there are not yet too many regions, + and we would otherwise need to extend, try to use mmap instead. */ if ((unsigned long)nb >= (unsigned long)mmap_threshold && + n_mmaps < n_mmaps_max && (victim = mmap_chunk(nb)) != 0) return victim; #endif @@ -2939,7 +2939,15 @@ chunk_alloc(ar_ptr, nb) arena *ar_ptr; INTERNAL_SIZE_T nb; /* Try to extend */ malloc_extend_top(ar_ptr, nb); if ((remainder_size = chunksize(top(ar_ptr)) - nb) < (long)MINSIZE) + { +#if HAVE_MMAP + /* A last attempt: when we are out of address space in the arena, + try mmap anyway, disregarding n_mmaps_max. */ + if((victim = mmap_chunk(nb)) != 0) + return victim; +#endif return 0; /* propagate failure */ + } } victim = top(ar_ptr); |