diff options
Diffstat (limited to 'malloc/malloc.c')
| -rw-r--r-- | malloc/malloc.c | 48 |
1 files changed, 39 insertions, 9 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index a369001..6427608 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -1618,7 +1618,7 @@ static Void_t* memalign_check(size_t alignment, size_t bytes, const Void_t *caller); #ifndef NO_THREADS # ifdef _LIBC -# if USE___THREAD || (defined USE_TLS && !defined SHARED) +# if USE___THREAD || !defined SHARED /* These routines are never needed in this configuration. */ # define NO_STARTER # endif @@ -2741,8 +2741,19 @@ static void do_check_malloc_state(mstate av) for (i = 0; i < NFASTBINS; ++i) { p = av->fastbins[i]; + /* The following test can only be performed for the main arena. + While mallopt calls malloc_consolidate to get rid of all fast + bins (especially those larger than the new maximum) this does + only happen for the main arena. Trying to do this for any + other arena would mean those arenas have to be locked and + malloc_consolidate be called for them. This is excessive. And + even if this is acceptable to somebody it still cannot solve + the problem completely since if the arena is locked a + concurrent malloc call might create a new arena which then + could use the newly invalid fast bins. */ + /* all bins past max_fast are empty */ - if (i > max_fast_bin) + if (av == &main_arena && i > max_fast_bin) assert(p == 0); while (p != 0) { @@ -2885,7 +2896,13 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av; is one SIZE_SZ unit larger than for normal chunks, because there is no following chunk whose prev_size field could be used. */ +#if 1 + /* See the front_misalign handling below, for glibc there is no + need for further alignments. */ + size = (nb + SIZE_SZ + pagemask) & ~pagemask; +#else size = (nb + SIZE_SZ + MALLOC_ALIGN_MASK + pagemask) & ~pagemask; +#endif tried_mmap = true; /* Don't try if size wraps around 0 */ @@ -2903,6 +2920,12 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av; address argument for later munmap in free() and realloc(). */ +#if 1 + /* For glibc, chunk2mem increases the address by 2*SIZE_SZ and + MALLOC_ALIGN_MASK is 2*SIZE_SZ-1. Each mmap'ed area is page + aligned and therefore definitely MALLOC_ALIGN_MASK-aligned. */ + assert (((INTERNAL_SIZE_T)chunk2mem(mm) & MALLOC_ALIGN_MASK) == 0); +#else front_misalign = (INTERNAL_SIZE_T)chunk2mem(mm) & MALLOC_ALIGN_MASK; if (front_misalign > 0) { correction = MALLOC_ALIGNMENT - front_misalign; @@ -2910,10 +2933,12 @@ static Void_t* sYSMALLOc(nb, av) INTERNAL_SIZE_T nb; mstate av; p->prev_size = correction; set_head(p, (size - correction) |IS_MMAPPED); } - else { - p = (mchunkptr)mm; - set_head(p, size|IS_MMAPPED); - } + else +#endif + { + p = (mchunkptr)mm; + set_head(p, size|IS_MMAPPED); + } /* update statistics */ @@ -4097,7 +4122,6 @@ _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) @@ -4194,8 +4218,6 @@ _int_malloc(mstate av, size_t bytes) fwd->bk = victim; bck->fd = victim; - if (size >= nb + MINSIZE) - any_larger = true; #define MAX_ITERS 10000 if (++iters >= MAX_ITERS) break; @@ -4684,7 +4706,15 @@ static void malloc_consolidate(av) mstate av; reused anyway. */ +#if 0 + /* It is wrong to limit the fast bins to search using get_max_fast + because, except for the main arena, all the others might have + blocks in the high fast bins. It's not worth it anyway, just + search all bins all the time. */ maxfb = &(av->fastbins[fastbin_index(get_max_fast ())]); +#else + maxfb = &(av->fastbins[NFASTBINS - 1]); +#endif fb = &(av->fastbins[0]); do { if ( (p = *fb) != 0) { |