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Replace --disable-munmap with opt.munmap.

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Control use of munmap(2) via a run-time option rather than a
compile-time option (with the same per platform default).  The old
behavior of --disable-munmap can be achieved with
--with-malloc-conf=munmap:false.

This partially resolves #580.
This commit is contained in:
Jason Evans
2017-04-24 17:28:55 -07:00
parent e2cc6280ed
commit c67c3e4a63
16 changed files with 77 additions and 85 deletions
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8
include/jemalloc/internal/arena_structs_b.h
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@@ -230,10 +230,10 @@ struct arena_s {
/*
* Next extent size class in a growing series to use when satisfying a
* request via the extent hooks (only if !config_munmap). This limits
* the number of disjoint virtual memory ranges so that extent merging
* can be effective even if multiple arenas' extent allocation requests
* are highly interleaved.
* request via the extent hooks (only if !opt_munmap). This limits the
* number of disjoint virtual memory ranges so that extent merging can
* be effective even if multiple arenas' extent allocation requests are
* highly interleaved.
*
* Synchronization: atomic.
*/

2
include/jemalloc/internal/extent_mmap_externs.h
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@@ -1,6 +1,8 @@
#ifndef JEMALLOC_INTERNAL_EXTENT_MMAP_EXTERNS_H
#define JEMALLOC_INTERNAL_EXTENT_MMAP_EXTERNS_H
extern bool opt_munmap;
void *extent_alloc_mmap(void *new_addr, size_t size, size_t alignment,
bool *zero, bool *commit);
bool extent_dalloc_mmap(void *addr, size_t size);

7
include/jemalloc/internal/jemalloc_internal_defs.h.in
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@@ -192,9 +192,10 @@
#undef JEMALLOC_MAPS_COALESCE
/*
* If defined, use munmap() to unmap freed extents, rather than storing them for
* later reuse. This is disabled by default on Linux because common sequences
* of mmap()/munmap() calls will cause virtual memory map holes.
* If defined, use munmap() to unmap freed extents by default, rather than
* storing them for later reuse. This is disabled on 64-bit Linux because
* common sequences of mmap()/munmap() calls will cause virtual memory map
* holes.
*/
#undef JEMALLOC_MUNMAP

7
include/jemalloc/internal/jemalloc_preamble.h.in
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@@ -98,13 +98,6 @@ static const bool maps_coalesce =
false
#endif
;
static const bool config_munmap =
#ifdef JEMALLOC_MUNMAP
true
#else
false
#endif
;
static const bool config_stats =
#ifdef JEMALLOC_STATS
true