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Disable munmap() if it causes VM map holes.

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Add a configure test to determine whether common mmap()/munmap()
patterns cause VM map holes, and only use munmap() to discard unused
chunks if the problem does not exist.

Unify the chunk caching for mmap and dss.

Fix options processing to limit lg_chunk to be large enough that
redzones will always fit.
This commit is contained in:
Jason Evans
2012-04-12 20:20:58 -07:00
parent d6abcbb14b
commit 7ca0fdfb85
11 changed files with 277 additions and 244 deletions
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10
src/arena.c
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@@ -676,16 +676,8 @@ arena_chunk_purge(arena_t *arena, arena_chunk_t *chunk)
if (config_debug)
ndirty -= npages;
#ifdef JEMALLOC_PURGE_MADVISE_DONTNEED
# define MADV_PURGE MADV_DONTNEED
#elif defined(JEMALLOC_PURGE_MADVISE_FREE)
# define MADV_PURGE MADV_FREE
#else
# error "No method defined for purging unused dirty pages."
#endif
madvise((void *)((uintptr_t)chunk + (pageind << LG_PAGE)),
(npages << LG_PAGE), MADV_PURGE);
#undef MADV_PURGE
(npages << LG_PAGE), JEMALLOC_MADV_PURGE);
if (config_stats)
nmadvise++;
}