diff options
Diffstat (limited to 'malloc/malloc.c')
| -rw-r--r-- | malloc/malloc.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index 890d3669e2..02f659708d 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 512k (i.e., 1M + for new heaps) wastes too much address space. */ +# if __WORDSIZE == 32 +# define DEFAULT_MMAP_THRESHOLD_MAX (512 * 1024) +# else +# define DEFAULT_MMAP_THRESHOLD_MAX (4 * 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 */ @@ -4055,6 +4068,8 @@ _int_malloc(mstate av, size_t bytes) for(;;) { + int iters = 0; + bool any_larger = false; while ( (victim = unsorted_chunks(av)->bk) != unsorted_chunks(av)) { bck = victim->bk; if (__builtin_expect (victim->size <= 2 * SIZE_SZ, 0) @@ -4150,6 +4165,12 @@ _int_malloc(mstate av, size_t bytes) victim->fd = fwd; fwd->bk = victim; bck->fd = victim; + + if (size >= nb) + any_larger = true; +#define MAX_ITERS 10000 + if (++iters >= MAX_ITERS) + break; } /* |