diff options
Diffstat (limited to 'malloc/malloc.c')
| -rw-r--r-- | malloc/malloc.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index b1f813efbe..7ad26af069 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -259,6 +259,7 @@ #ifdef _LIBC #include <stdio-common/_itoa.h> +#include <bits/wordsize.h> #endif #ifdef __cplusplus @@ -1424,7 +1425,15 @@ int __posix_memalign(void **, size_t, size_t); #endif #ifndef DEFAULT_MMAP_THRESHOLD_MAX -#define DEFAULT_MMAP_THRESHOLD_MAX (8 * 1024 * 1024 * sizeof(long)) + /* For 32-bit platforms we cannot increase the maximum mmap + threshold much because it is also the minimum value for the + maximum heap size and its alignment. Going above 1MB wastes too + much address space. */ +# if __WORDSIZE == 32 +# define DEFAULT_MMAP_THRESHOLD_MAX (1024 * 1024) +# else +# define DEFAULT_MMAP_THRESHOLD_MAX (8 * 1024 * 1024 * sizeof(long)) +# endif #endif /* @@ -2867,6 +2876,7 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av; char* mm; /* return value from mmap call*/ + try_mmap: /* Round up size to nearest page. For mmapped chunks, the overhead is one SIZE_SZ unit larger than for normal chunks, because there @@ -2996,6 +3006,9 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av; set_foot(old_top, (old_size + 2*SIZE_SZ)); } } + else + /* We can at least try to use to mmap memory. */ + goto try_mmap; } else { /* av == main_arena */ |