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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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15
include/jemalloc/jemalloc_defs.h.in
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@ -172,6 +172,14 @@
/* One page is 2^STATIC_PAGE_SHIFT bytes. */
#undef STATIC_PAGE_SHIFT
/*
* If defined, use munmap() to unmap freed chunks, rather than storing them for
* later reuse. This is automatically disabled if configuration determines
* that common sequences of mmap()/munmap() calls will cause virtual memory map
* holes.
*/
#undef JEMALLOC_MUNMAP
/* TLS is used to map arenas and magazine caches to threads. */
#undef JEMALLOC_TLS
@ -209,6 +217,13 @@
*/
#undef JEMALLOC_PURGE_MADVISE_DONTNEED
#undef JEMALLOC_PURGE_MADVISE_FREE
#ifdef JEMALLOC_PURGE_MADVISE_DONTNEED
# define JEMALLOC_MADV_PURGE MADV_DONTNEED
#elif defined(JEMALLOC_PURGE_MADVISE_FREE)
# define JEMALLOC_MADV_PURGE MADV_FREE
#else
# error "No method defined for purging unused dirty pages."
#endif
/* sizeof(void *) == 2^LG_SIZEOF_PTR. */
#undef LG_SIZEOF_PTR