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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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9
INSTALL
View File

@ -128,15 +128,6 @@ any of the following arguments (not a definitive list) to 'configure':
Statically link against the specified libunwind.a rather than dynamically
linking with -lunwind.
--disable-munmap
Disable virtual memory deallocation via munmap(2); instead keep track of
the virtual memory for later use. munmap() is disabled by default (i.e.
--disable-munmap is implied) on [64-bit] Linux, which has a quirk in its
virtual memory allocation algorithm that causes semi-permanent VM map holes
under normal jemalloc operation. Although munmap() causes issues on 32-bit
Linux as well, it is not disabled by default due to the practical
possibility of address space exhaustion.
--disable-fill
Disable support for junk/zero filling of memory. See the "opt.junk" and
"opt.zero" option documentation for usage details.

16
configure.ac
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@ -1086,21 +1086,10 @@ if test "x${maps_coalesce}" = "x1" ; then
AC_DEFINE([JEMALLOC_MAPS_COALESCE], [ ])
fi
dnl Enable VM deallocation via munmap() by default.
AC_ARG_ENABLE([munmap],
[AS_HELP_STRING([--disable-munmap], [Disable VM deallocation via munmap(2)])],
[if test "x$enable_munmap" = "xno" ; then
enable_munmap="0"
else
enable_munmap="1"
fi
],
[enable_munmap="${default_munmap}"]
)
if test "x$enable_munmap" = "x1" ; then
dnl Indicate whether to use munmap() by default.
if test "x$default_munmap" = "x1" ; then
AC_DEFINE([JEMALLOC_MUNMAP], [ ])
fi
AC_SUBST([enable_munmap])
dnl Enable allocation from DSS if supported by the OS.
have_dss="1"
@ -2076,7 +2065,6 @@ AC_MSG_RESULT([prof-gcc : ${enable_prof_gcc}])
AC_MSG_RESULT([fill : ${enable_fill}])
AC_MSG_RESULT([utrace : ${enable_utrace}])
AC_MSG_RESULT([xmalloc : ${enable_xmalloc}])
AC_MSG_RESULT([munmap : ${enable_munmap}])
AC_MSG_RESULT([lazy_lock : ${enable_lazy_lock}])
AC_MSG_RESULT([cache-oblivious : ${enable_cache_oblivious}])
AC_MSG_RESULT([cxx : ${enable_cxx}])

38
doc/jemalloc.xml.in
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@ -788,16 +788,6 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
during build configuration.</para></listitem>
</varlistentry>
<varlistentry id="config.munmap">
<term>
<mallctl>config.munmap</mallctl>
(<type>bool</type>)
<literal>r-</literal>
</term>
<listitem><para><option>--enable-munmap</option> was specified during
build configuration.</para></listitem>
</varlistentry>
<varlistentry id="config.prof">
<term>
<mallctl>config.prof</mallctl>
@ -873,6 +863,28 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
</para></listitem>
</varlistentry>
<varlistentry id="opt.munmap">
<term>
<mallctl>opt.munmap</mallctl>
(<type>bool</type>)
<literal>r-</literal>
</term>
<listitem><para>If true, call
<citerefentry><refentrytitle>munmap</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> or equivalent rather than
retaining unused virtual memory (see <link
linkend="stats.retained">stats.retained</link> for related details).
This option is enabled by default unless it is known to trigger
platform-specific performance problems, e.g. for [64-bit] Linux, which
has a quirk in its virtual memory allocation algorithm that causes
semi-permanent VM map holes under normal jemalloc operation. Although
<citerefentry><refentrytitle>munmap</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> causes issues on 32-bit Linux as
well, it is not disabled by default due to the practical possibility of
address space exhaustion.
</para></listitem>
</varlistentry>
<varlistentry id="opt.dss">
<term>
<mallctl>opt.dss</mallctl>
@ -2114,9 +2126,9 @@ struct extent_hooks_s {
<listitem><para>Total number of bytes in virtual memory mappings that
were retained rather than being returned to the operating system via
e.g. <citerefentry><refentrytitle>munmap</refentrytitle>
<manvolnum>2</manvolnum></citerefentry>. Retained virtual memory is
typically untouched, decommitted, or purged, so it has no strongly
associated physical memory (see <link
<manvolnum>2</manvolnum></citerefentry> or similar. Retained virtual
memory is typically untouched, decommitted, or purged, so it has no
strongly associated physical memory (see <link
linkend="arena.i.extent_hooks">extent hooks</link> for details).
Retained memory is excluded from mapped memory statistics, e.g. <link
linkend="stats.mapped"><mallctl>stats.mapped</mallctl></link>.

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
View File

@ -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

4
src/arena.c
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@ -1143,7 +1143,7 @@ arena_destroy_retained(tsdn_t *tsdn, arena_t *arena) {
* opportunity to unmap all retained memory without having to keep its
* own metadata structures, but if deallocation fails, that is the
* application's decision/problem. In practice, retained extents are
* leaked here if !config_munmap unless the application provided custom
* leaked here if !opt_munmap unless the application provided custom
* extent hooks, so best practice is to either enable munmap (and avoid
* dss for arenas to be destroyed), or provide custom extent hooks that
* either unmap retained extents or track them for later use.
@ -1947,7 +1947,7 @@ arena_new(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
goto label_error;
}
if (!config_munmap) {
if (!opt_munmap) {
atomic_store_u(&arena->extent_grow_next, psz2ind(HUGEPAGE),
ATOMIC_RELAXED);
}

6
src/ctl.c
View File

@ -66,7 +66,6 @@ CTL_PROTO(config_debug)
CTL_PROTO(config_fill)
CTL_PROTO(config_lazy_lock)
CTL_PROTO(config_malloc_conf)
CTL_PROTO(config_munmap)
CTL_PROTO(config_prof)
CTL_PROTO(config_prof_libgcc)
CTL_PROTO(config_prof_libunwind)
@ -74,6 +73,7 @@ CTL_PROTO(config_stats)
CTL_PROTO(config_utrace)
CTL_PROTO(config_xmalloc)
CTL_PROTO(opt_abort)
CTL_PROTO(opt_munmap)
CTL_PROTO(opt_dss)
CTL_PROTO(opt_narenas)
CTL_PROTO(opt_percpu_arena)
@ -249,7 +249,6 @@ static const ctl_named_node_t config_node[] = {
{NAME("fill"), CTL(config_fill)},
{NAME("lazy_lock"), CTL(config_lazy_lock)},
{NAME("malloc_conf"), CTL(config_malloc_conf)},
{NAME("munmap"), CTL(config_munmap)},
{NAME("prof"), CTL(config_prof)},
{NAME("prof_libgcc"), CTL(config_prof_libgcc)},
{NAME("prof_libunwind"), CTL(config_prof_libunwind)},
@ -260,6 +259,7 @@ static const ctl_named_node_t config_node[] = {
static const ctl_named_node_t opt_node[] = {
{NAME("abort"), CTL(opt_abort)},
{NAME("munmap"), CTL(opt_munmap)},
{NAME("dss"), CTL(opt_dss)},
{NAME("narenas"), CTL(opt_narenas)},
{NAME("percpu_arena"), CTL(opt_percpu_arena)},
@ -1444,7 +1444,6 @@ CTL_RO_CONFIG_GEN(config_debug, bool)
CTL_RO_CONFIG_GEN(config_fill, bool)
CTL_RO_CONFIG_GEN(config_lazy_lock, bool)
CTL_RO_CONFIG_GEN(config_malloc_conf, const char *)
CTL_RO_CONFIG_GEN(config_munmap, bool)
CTL_RO_CONFIG_GEN(config_prof, bool)
CTL_RO_CONFIG_GEN(config_prof_libgcc, bool)
CTL_RO_CONFIG_GEN(config_prof_libunwind, bool)
@ -1455,6 +1454,7 @@ CTL_RO_CONFIG_GEN(config_xmalloc, bool)
/******************************************************************************/
CTL_RO_NL_GEN(opt_abort, opt_abort, bool)
CTL_RO_NL_GEN(opt_munmap, opt_munmap, bool)
CTL_RO_NL_GEN(opt_dss, opt_dss, const char *)
CTL_RO_NL_GEN(opt_narenas, opt_narenas, unsigned)
CTL_RO_NL_GEN(opt_percpu_arena, opt_percpu_arena, const char *)

2
src/extent.c
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@ -1123,7 +1123,7 @@ extent_alloc_retained(tsdn_t *tsdn, arena_t *arena,
extent_gdump_add(tsdn, extent);
}
}
if (!config_munmap && extent == NULL) {
if (!opt_munmap && extent == NULL) {
extent = extent_grow_retained(tsdn, arena, r_extent_hooks,
new_addr, size, pad, alignment, slab, szind, zero, commit);
}

15
src/extent_mmap.c
View File

@ -4,6 +4,17 @@
#include "jemalloc/internal/assert.h"
/******************************************************************************/
/* Data. */
bool opt_munmap =
#ifdef JEMALLOC_MUNMAP
true
#else
false
#endif
;
/******************************************************************************/
void *
@ -23,8 +34,8 @@ extent_alloc_mmap(void *new_addr, size_t size, size_t alignment, bool *zero,
bool
extent_dalloc_mmap(void *addr, size_t size) {
if (config_munmap) {
if (opt_munmap) {
pages_unmap(addr, size);
}
return !config_munmap;
return !opt_munmap;
}

36
src/jemalloc.c
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@ -947,7 +947,7 @@ malloc_conf_init(void) {
(sizeof(n)-1 == klen && strncmp(n, k, klen) == 0)
#define CONF_MATCH_VALUE(n) \
(sizeof(n)-1 == vlen && strncmp(n, v, vlen) == 0)
#define CONF_HANDLE_BOOL(o, n, cont) \
#define CONF_HANDLE_BOOL(o, n) \
if (CONF_MATCH(n)) { \
if (CONF_MATCH_VALUE("true")) { \
o = true; \
@ -958,9 +958,7 @@ malloc_conf_init(void) {
"Invalid conf value", \
k, klen, v, vlen); \
} \
if (cont) { \
continue; \
} \
}
#define CONF_MIN_no(um, min) false
#define CONF_MIN_yes(um, min) ((um) < (min))
@ -1043,7 +1041,8 @@ malloc_conf_init(void) {
continue; \
}
CONF_HANDLE_BOOL(opt_abort, "abort", true)
CONF_HANDLE_BOOL(opt_abort, "abort")
CONF_HANDLE_BOOL(opt_munmap, "munmap")
if (strncmp("dss", k, klen) == 0) {
int i;
bool match = false;
@ -1074,7 +1073,7 @@ malloc_conf_init(void) {
"dirty_decay_time", -1, NSTIME_SEC_MAX);
CONF_HANDLE_SSIZE_T(opt_muzzy_decay_time,
"muzzy_decay_time", -1, NSTIME_SEC_MAX);
CONF_HANDLE_BOOL(opt_stats_print, "stats_print", true)
CONF_HANDLE_BOOL(opt_stats_print, "stats_print")
if (config_fill) {
if (CONF_MATCH("junk")) {
if (CONF_MATCH_VALUE("true")) {
@ -1100,15 +1099,15 @@ malloc_conf_init(void) {
}
continue;
}
CONF_HANDLE_BOOL(opt_zero, "zero", true)
CONF_HANDLE_BOOL(opt_zero, "zero")
}
if (config_utrace) {
CONF_HANDLE_BOOL(opt_utrace, "utrace", true)
CONF_HANDLE_BOOL(opt_utrace, "utrace")
}
if (config_xmalloc) {
CONF_HANDLE_BOOL(opt_xmalloc, "xmalloc", true)
CONF_HANDLE_BOOL(opt_xmalloc, "xmalloc")
}
CONF_HANDLE_BOOL(opt_tcache, "tcache", true)
CONF_HANDLE_BOOL(opt_tcache, "tcache")
CONF_HANDLE_SSIZE_T(opt_lg_tcache_max, "lg_tcache_max",
-1, (sizeof(size_t) << 3) - 1)
if (strncmp("percpu_arena", k, klen) == 0) {
@ -1136,27 +1135,22 @@ malloc_conf_init(void) {
continue;
}
if (config_prof) {
CONF_HANDLE_BOOL(opt_prof, "prof", true)
CONF_HANDLE_BOOL(opt_prof, "prof")
CONF_HANDLE_CHAR_P(opt_prof_prefix,
"prof_prefix", "jeprof")
CONF_HANDLE_BOOL(opt_prof_active, "prof_active",
true)
CONF_HANDLE_BOOL(opt_prof_active, "prof_active")
CONF_HANDLE_BOOL(opt_prof_thread_active_init,
"prof_thread_active_init", true)
"prof_thread_active_init")
CONF_HANDLE_SIZE_T(opt_lg_prof_sample,
"lg_prof_sample", 0, (sizeof(uint64_t) << 3)
- 1, no, yes, true)
CONF_HANDLE_BOOL(opt_prof_accum, "prof_accum",
true)
CONF_HANDLE_BOOL(opt_prof_accum, "prof_accum")
CONF_HANDLE_SSIZE_T(opt_lg_prof_interval,
"lg_prof_interval", -1,
(sizeof(uint64_t) << 3) - 1)
CONF_HANDLE_BOOL(opt_prof_gdump, "prof_gdump",
true)
CONF_HANDLE_BOOL(opt_prof_final, "prof_final",
true)
CONF_HANDLE_BOOL(opt_prof_leak, "prof_leak",
true)
CONF_HANDLE_BOOL(opt_prof_gdump, "prof_gdump")
CONF_HANDLE_BOOL(opt_prof_final, "prof_final")
CONF_HANDLE_BOOL(opt_prof_leak, "prof_leak")
}
malloc_conf_error("Invalid conf pair", k, klen, v,
vlen);

2
src/large.c
View File

@ -93,7 +93,7 @@ large_dalloc_maybe_junk(void *ptr, size_t size) {
* Only bother junk filling if the extent isn't about to be
* unmapped.
*/
if (!config_munmap || (have_dss && extent_in_dss(ptr))) {
if (!opt_munmap || (have_dss && extent_in_dss(ptr))) {
large_dalloc_junk(ptr, size);
}
}

2
src/stats.c
View File

@ -707,7 +707,6 @@ stats_general_print(void (*write_cb)(void *, const char *), void *cbopaque,
"config.malloc_conf: \"%s\"\n", config_malloc_conf);
}
CONFIG_WRITE_BOOL_JSON(munmap, ",")
CONFIG_WRITE_BOOL_JSON(prof, ",")
CONFIG_WRITE_BOOL_JSON(prof_libgcc, ",")
CONFIG_WRITE_BOOL_JSON(prof_libunwind, ",")
@ -801,6 +800,7 @@ stats_general_print(void (*write_cb)(void *, const char *), void *cbopaque,
"Run-time option settings:\n");
}
OPT_WRITE_BOOL(abort, ",")
OPT_WRITE_BOOL(munmap, ",")
OPT_WRITE_CHAR_P(dss, ",")
OPT_WRITE_UNSIGNED(narenas, ",")
OPT_WRITE_CHAR_P(percpu_arena, ",")

4
test/unit/arena_reset.c
View File

@ -251,8 +251,8 @@ TEST_BEGIN(test_arena_destroy_hooks_default) {
TEST_END
/*
* Actually unmap extents, regardless of config_munmap, so that attempts to
* access a destroyed arena's memory will segfault.
* Actually unmap extents, regardless of opt_munmap, so that attempts to access
* a destroyed arena's memory will segfault.
*/
static bool
extent_dalloc_unmap(extent_hooks_t *extent_hooks, void *addr, size_t size,

2
test/unit/mallctl.c
View File

@ -131,7 +131,6 @@ TEST_BEGIN(test_mallctl_config) {
TEST_MALLCTL_CONFIG(fill, bool);
TEST_MALLCTL_CONFIG(lazy_lock, bool);
TEST_MALLCTL_CONFIG(malloc_conf, const char *);
TEST_MALLCTL_CONFIG(munmap, bool);
TEST_MALLCTL_CONFIG(prof, bool);
TEST_MALLCTL_CONFIG(prof_libgcc, bool);
TEST_MALLCTL_CONFIG(prof_libunwind, bool);
@ -158,6 +157,7 @@ TEST_BEGIN(test_mallctl_opt) {
} while (0)
TEST_MALLCTL_OPT(bool, abort, always);
TEST_MALLCTL_OPT(bool, munmap, always);
TEST_MALLCTL_OPT(const char *, dss, always);
TEST_MALLCTL_OPT(unsigned, narenas, always);
TEST_MALLCTL_OPT(const char *, percpu_arena, always);