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Add the --enable-mremap option.

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Add the --enable-mremap option, and disable the use of mremap(2) by
default, for the same reason that freeing chunks via munmap(2) is
disabled by default on Linux: semi-permanent VM map fragmentation.
This commit is contained in:
Jason Evans 2012-05-09 16:12:00 -07:00
parent 374d26a43b
commit 2e671ffbad
7 changed files with 64 additions and 17 deletions
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7
include/jemalloc/internal/jemalloc_internal.h.in
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@ -123,6 +123,13 @@ static const bool config_prof_libunwind =
false
#endif
;
static const bool config_mremap =
#ifdef JEMALLOC_MREMAP
true
#else
false
#endif
;
static const bool config_munmap =
#ifdef JEMALLOC_MUNMAP
true

15
include/jemalloc/jemalloc_defs.h.in
View file

@ -193,12 +193,18 @@
/*
* 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.
* later reuse. This is disabled by default on Linux because common sequences
* of mmap()/munmap() calls will cause virtual memory map holes.
*/
#undef JEMALLOC_MUNMAP
/*
* If defined, use mremap(...MREMAP_FIXED...) for huge realloc(). This is
* disabled by default because it is Linux-specific and it will cause virtual
* memory map holes, much like munmap(2) does.
*/
#undef JEMALLOC_MREMAP
/* TLS is used to map arenas and magazine caches to threads. */
#undef JEMALLOC_TLS
@ -221,9 +227,6 @@
#undef JEMALLOC_ZONE
#undef JEMALLOC_ZONE_VERSION
/* If defined, use mremap(...MREMAP_FIXED...) for huge realloc(). */
#undef JEMALLOC_MREMAP_FIXED
/*
* Methods for purging unused pages differ between operating systems.
*