Merge branch 'dev'

.gitignore

@@ -3,6 +3,10 @@
 /jemalloc/config.log
 /jemalloc/config.status
 /jemalloc/configure
+/jemalloc/doc/html.xsl
+/jemalloc/doc/manpages.xsl
+/jemalloc/doc/jemalloc.xml
+/jemalloc/doc/jemalloc.html
 /jemalloc/doc/jemalloc.3
 /jemalloc/lib/
 /jemalloc/Makefile
@@ -13,4 +17,7 @@
 /jemalloc/src/*.[od]
 /jemalloc/test/*.[od]
 /jemalloc/test/*.out
+/jemalloc/test/[a-z]*
+!/jemalloc/test/*.c
+!/jemalloc/test/*.exp
 /jemalloc/VERSION

jemalloc/ChangeLog

@@ -6,6 +6,23 @@ found in the git revision history:
     http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git
     git://canonware.com/jemalloc.git
 
+* 2.1.0
+
+  This version incorporates some optimizations that can't quite be considered
+  bug fixes.
+
+  New features:
+  - Use Linux's mremap(2) for huge object reallocation when possible.
+  - Avoid locking in mallctl*() when possible.
+  - Add the "thread.[de]allocatedp" mallctl's.
+  - Convert the manual page source from roff to DocBook, and generate both roff
+    and HTML manuals.
+
+  Bug fixes:
+  - Fix a crash due to incorrect bootstrap ordering.  This only impacted
+    --enable-debug --enable-dss configurations.
+  - Fix a minor statistics bug for mallctl("swap.avail", ...).
+
 * 2.0.1
 
   Bug fixes:

jemalloc/INSTALL

@@ -132,8 +132,11 @@ any of the following arguments (not a definitive list) to 'configure':
 --disable-tls
     Disable thread-local storage (TLS), which allows for fast access to
     thread-local variables via the __thread keyword.  If TLS is available,
-    jemalloc uses it for several purposes.  Note that disabling TLS implies
+    jemalloc uses it for several purposes.
-    --disable-tcache.
+
+--with-xslroot=<path>
+    Specify where to find DocBook XSL stylesheets when building the
+    documentation.
 
 The following environment variables (not a definitive list) impact configure's
 behavior:
@@ -172,7 +175,7 @@ To install only parts of jemalloc, use the following targets:
     install_bin
     install_include
     install_lib
-    install_man
+    install_doc
 
 To clean up build results to varying degrees, use the following make targets:
 
@@ -232,11 +235,12 @@ directory, issue configuration and build commands:
 
 === Documentation ==============================================================
 
-The manual page that the configure script generates can be manually formatted
+The manual page is generated in both html and roff formats.  Any web browser
+can be used to view the html manual.  The roff manual page can be formatted
 prior to installation via any of the following commands:
 
-    nroff -man -man-ext -t doc/jemalloc.3
+    nroff -man -t doc/jemalloc.3
 
-    groff -man -man-ext -t -Tps doc/jemalloc.3 | ps2pdf - doc/jemalloc.3.pdf
+    groff -man -t -Tps doc/jemalloc.3 | ps2pdf - doc/jemalloc.3.pdf
 
     (cd doc; groff -man -man-ext -t -Thtml jemalloc.3 > jemalloc.3.html)

jemalloc/Makefile.in

@@ -15,6 +15,7 @@ DESTDIR =
 BINDIR := $(DESTDIR)@BINDIR@
 INCLUDEDIR := $(DESTDIR)@INCLUDEDIR@
 LIBDIR := $(DESTDIR)@LIBDIR@
+DATADIR := $(DESTDIR)@DATADIR@
 MANDIR := $(DESTDIR)@MANDIR@
 
 # Build parameters.
@@ -58,15 +59,34 @@ DSOS := @objroot@lib/libjemalloc@install_suffix@.$(SO).$(REV) \
 	@objroot@lib/libjemalloc@install_suffix@.$(SO) \
 	@objroot@lib/libjemalloc@install_suffix@_pic.a
 MAN3 := @objroot@doc/jemalloc@install_suffix@.3
+DOCS_XML := @objroot@doc/jemalloc@install_suffix@.xml
+DOCS_HTML := $(DOCS_XML:@objroot@%.xml=@srcroot@%.html)
+DOCS_MAN3 := $(DOCS_XML:@objroot@%.xml=@srcroot@%.3)
+DOCS := $(DOCS_HTML) $(DOCS_MAN3)
 CTESTS := @srcroot@test/allocated.c @srcroot@test/allocm.c \
-	@srcroot@test/posix_memalign.c \
+	@srcroot@test/mremap.c @srcroot@test/posix_memalign.c \
 	@srcroot@test/rallocm.c @srcroot@test/thread_arena.c
 
-.PHONY: all dist install check clean distclean relclean
+.PHONY: all dist doc_html doc_man doc
+.PHONY: install_bin install_include install_lib
+.PHONY: install_html install_man install_doc install
+.PHONY: tests check clean distclean relclean
 
 # Default target.
 all: $(DSOS)
 
+dist: doc
+
+@srcroot@doc/%.html : @objroot@doc/%.xml @srcroot@doc/stylesheet.xsl @objroot@doc/html.xsl
+	@XSLTPROC@ -o $@ @objroot@doc/html.xsl $<
+
+@srcroot@doc/%.3 : @objroot@doc/%.xml @srcroot@doc/stylesheet.xsl @objroot@doc/manpages.xsl
+	@XSLTPROC@ -o $@ @objroot@doc/manpages.xsl $<
+
+doc_html: $(DOCS_HTML)
+doc_man: $(DOCS_MAN3)
+doc: $(DOCS)
+
 #
 # Include generated dependency files.
 #
@@ -123,14 +143,23 @@ install_lib: $(DSOS)
 	ln -sf libjemalloc@install_suffix@.$(SO).$(REV) $(LIBDIR)/libjemalloc@install_suffix@.$(SO)
 	install -m 755 @objroot@lib/libjemalloc@install_suffix@_pic.a $(LIBDIR)
 
-install_man:
+install_html:
-	install -d $(MANDIR)/man3
+	install -d $(DATADIR)/doc/jemalloc@install_suffix@
-	@for m in $(MAN3); do \
+	@for d in $(DOCS_HTML); do \
-	echo "install -m 644 $$m $(MANDIR)/man3"; \
+	echo "install -m 644 $$d $(DATADIR)/doc/jemalloc@install_suffix@"; \
-	install -m 644 $$m $(MANDIR)/man3; \
+	install -m 644 $$d $(DATADIR)/doc/jemalloc@install_suffix@; \
 done
 
-install: install_bin install_include install_lib install_man
+install_man:
+	install -d $(MANDIR)/man3
+	@for d in $(DOCS_MAN3); do \
+	echo "install -m 644 $$d $(MANDIR)/man3"; \
+	install -m 644 $$d $(MANDIR)/man3; \
+done
+
+install_doc: install_html install_man
+
+install: install_bin install_include install_lib install_doc
 
 tests: $(CTESTS:@srcroot@%.c=@objroot@%)
 
@@ -182,6 +211,8 @@ distclean: clean
 relclean: distclean
 	rm -f @objroot@configure
 	rm -f @srcroot@VERSION
+	rm -f $(DOCS_HTML)
+	rm -f $(DOCS_MAN3)
 
 #===============================================================================
 # Re-configuration rules.

jemalloc/configure.ac

@@ -80,6 +80,19 @@ MANDIR=`eval echo $mandir`
 MANDIR=`eval echo $MANDIR`
 AC_SUBST([MANDIR])
 
+dnl Support for building documentation.
+AC_PATH_PROG([XSLTPROC], [xsltproc], , [$PATH])
+AC_ARG_WITH([xslroot],
+  [AS_HELP_STRING([--with-xslroot=<path>], [XSL stylesheet root path])],
+if test "x$with_xslroot" = "xno" ; then
+  XSLROOT="/usr/share/xml/docbook/stylesheet/docbook-xsl"
+else
+  XSLROOT="${with_xslroot}"
+fi,
+  XSLROOT="/usr/share/xml/docbook/stylesheet/docbook-xsl"
+)
+AC_SUBST([XSLROOT])
+
 dnl If CFLAGS isn't defined, set CFLAGS to something reasonable.  Otherwise,
 dnl just prevent autoconf from molesting CFLAGS.
 CFLAGS=$CFLAGS
@@ -214,6 +227,16 @@ esac
 AC_SUBST([abi])
 AC_SUBST([RPATH])
 
+JE_COMPILABLE([mremap(...MREMAP_FIXED...)], [
+#define _GNU_SOURCE
+#include <sys/mman.h>
+], [
+void *p = mremap((void *)0, 0, 0, MREMAP_MAYMOVE|MREMAP_FIXED, (void *)0);
+], [mremap_fixed])
+if test "x${mremap_fixed}" = "xyes" ; then
+  AC_DEFINE([JEMALLOC_MREMAP_FIXED])
+fi
+
 dnl Support optional additions to rpath.
 AC_ARG_WITH([rpath],
   [AS_HELP_STRING([--with-rpath=<rpath>], [Colon-separated rpath (ELF systems only)])],
@@ -275,17 +298,26 @@ AC_ARG_WITH([install_suffix],
 install_suffix="$INSTALL_SUFFIX"
 AC_SUBST([install_suffix])
 
-cfgoutputs_in="${srcroot}Makefile.in ${srcroot}doc/jemalloc.3.in"
+cfgoutputs_in="${srcroot}Makefile.in"
+cfgoutputs_in="${cfgoutputs_in} ${srcroot}doc/html.xsl.in"
+cfgoutputs_in="${cfgoutputs_in} ${srcroot}doc/manpages.xsl.in"
+cfgoutputs_in="${cfgoutputs_in} ${srcroot}doc/jemalloc.xml.in"
 cfgoutputs_in="${cfgoutputs_in} ${srcroot}include/jemalloc/jemalloc.h.in"
 cfgoutputs_in="${cfgoutputs_in} ${srcroot}include/jemalloc/internal/jemalloc_internal.h.in"
 cfgoutputs_in="${cfgoutputs_in} ${srcroot}test/jemalloc_test.h.in"
 
-cfgoutputs_out="Makefile doc/jemalloc${install_suffix}.3"
+cfgoutputs_out="Makefile"
+cfgoutputs_out="${cfgoutputs_out} doc/html.xsl"
+cfgoutputs_out="${cfgoutputs_out} doc/manpages.xsl"
+cfgoutputs_out="${cfgoutputs_out} doc/jemalloc${install_suffix}.xml"
 cfgoutputs_out="${cfgoutputs_out} include/jemalloc/jemalloc${install_suffix}.h"
 cfgoutputs_out="${cfgoutputs_out} include/jemalloc/internal/jemalloc_internal.h"
 cfgoutputs_out="${cfgoutputs_out} test/jemalloc_test.h"
 
-cfgoutputs_tup="Makefile doc/jemalloc${install_suffix}.3:doc/jemalloc.3.in"
+cfgoutputs_tup="Makefile"
+cfgoutputs_tup="${cfgoutputs_tup} doc/html.xsl:doc/html.xsl.in"
+cfgoutputs_tup="${cfgoutputs_tup} doc/manpages.xsl:doc/manpages.xsl.in"
+cfgoutputs_tup="${cfgoutputs_tup} doc/jemalloc${install_suffix}.xml:doc/jemalloc.xml.in"
 cfgoutputs_tup="${cfgoutputs_tup} include/jemalloc/jemalloc${install_suffix}.h:include/jemalloc/jemalloc.h.in"
 cfgoutputs_tup="${cfgoutputs_tup} include/jemalloc/internal/jemalloc_internal.h"
 cfgoutputs_tup="${cfgoutputs_tup} test/jemalloc_test.h:test/jemalloc_test.h.in"
@@ -329,15 +361,6 @@ if test "x$enable_debug" = "x1" ; then
   AC_DEFINE([JEMALLOC_IVSALLOC], [ ])
 fi
 AC_SUBST([enable_debug])
-if test "x$enable_debug" = "x0" ; then
-  roff_debug=".\\\" "
-  roff_no_debug=""
-else
-  roff_debug=""
-  roff_no_debug=".\\\" "
-fi
-AC_SUBST([roff_debug])
-AC_SUBST([roff_no_debug])
 
 dnl Only optimize if not debugging.
 if test "x$enable_debug" = "x0" -a "x$no_CFLAGS" = "xyes" ; then
@@ -369,12 +392,6 @@ if test "x$enable_stats" = "x1" ; then
   AC_DEFINE([JEMALLOC_STATS], [ ])
 fi
 AC_SUBST([enable_stats])
-if test "x$enable_stats" = "x0" ; then
-  roff_stats=".\\\" "
-else
-  roff_stats=""
-fi
-AC_SUBST([roff_stats])
 
 dnl Do not enable profiling by default.
 AC_ARG_ENABLE([prof],
@@ -438,15 +455,6 @@ if test "x$enable_prof" = "x1" ; then
   fi
 fi
 AC_SUBST([enable_prof])
-if test "x$enable_prof" = "x0" ; then
-  roff_prof=".\\\" "
-  roff_no_prof=""
-else
-  roff_prof=""
-  roff_no_prof=".\\\" "
-fi
-AC_SUBST([roff_prof])
-AC_SUBST([roff_no_prof])
 
 dnl If libunwind isn't enabled, try to use libgcc rather than gcc intrinsics
 dnl for backtracing.
@@ -478,15 +486,6 @@ if test "x$enable_tiny" = "x1" ; then
   AC_DEFINE([JEMALLOC_TINY], [ ])
 fi
 AC_SUBST([enable_tiny])
-if test "x$enable_tiny" = "x0" ; then
-  roff_tiny=".\\\" "
-  roff_no_tiny=""
-else
-  roff_tiny=""
-  roff_no_tiny=".\\\" "
-fi
-AC_SUBST([roff_tiny])
-AC_SUBST([roff_no_tiny])
 
 dnl Enable thread-specific caching by default.
 AC_ARG_ENABLE([tcache],
@@ -503,15 +502,6 @@ if test "x$enable_tcache" = "x1" ; then
   AC_DEFINE([JEMALLOC_TCACHE], [ ])
 fi
 AC_SUBST([enable_tcache])
-if test "x$enable_tcache" = "x0" ; then
-  roff_tcache=".\\\" "
-  roff_no_tcache=""
-else
-  roff_tcache=""
-  roff_no_tcache=".\\\" "
-fi
-AC_SUBST([roff_tcache])
-AC_SUBST([roff_no_tcache])
 
 dnl Do not enable mmap()ped swap files by default.
 AC_ARG_ENABLE([swap],
@@ -528,12 +518,6 @@ if test "x$enable_swap" = "x1" ; then
   AC_DEFINE([JEMALLOC_SWAP], [ ])
 fi
 AC_SUBST([enable_swap])
-if test "x$enable_swap" = "x0" ; then
-  roff_swap=".\\\" "
-else
-  roff_swap=""
-fi
-AC_SUBST([roff_swap])
 
 dnl Do not enable allocation from DSS by default.
 AC_ARG_ENABLE([dss],
@@ -550,12 +534,6 @@ if test "x$enable_dss" = "x1" ; then
   AC_DEFINE([JEMALLOC_DSS], [ ])
 fi
 AC_SUBST([enable_dss])
-if test "x$enable_dss" = "x0" ; then
-  roff_dss=".\\\" "
-else
-  roff_dss=""
-fi
-AC_SUBST([roff_dss])
 
 dnl Do not support the junk/zero filling option by default.
 AC_ARG_ENABLE([fill],
@@ -572,12 +550,6 @@ if test "x$enable_fill" = "x1" ; then
   AC_DEFINE([JEMALLOC_FILL], [ ])
 fi
 AC_SUBST([enable_fill])
-if test "x$enable_fill" = "x0" ; then
-  roff_fill=".\\\" "
-else
-  roff_fill=""
-fi
-AC_SUBST([roff_fill])
 
 dnl Do not support the xmalloc option by default.
 AC_ARG_ENABLE([xmalloc],
@@ -594,12 +566,6 @@ if test "x$enable_xmalloc" = "x1" ; then
   AC_DEFINE([JEMALLOC_XMALLOC], [ ])
 fi
 AC_SUBST([enable_xmalloc])
-if test "x$enable_xmalloc" = "x0" ; then
-  roff_xmalloc=".\\\" "
-else
-  roff_xmalloc=""
-fi
-AC_SUBST([roff_xmalloc])
 
 dnl Do not support the SYSV option by default.
 AC_ARG_ENABLE([sysv],
@@ -616,12 +582,6 @@ if test "x$enable_sysv" = "x1" ; then
   AC_DEFINE([JEMALLOC_SYSV], [ ])
 fi
 AC_SUBST([enable_sysv])
-if test "x$enable_sysv" = "x0" ; then
-  roff_sysv=".\\\" "
-else
-  roff_sysv=""
-fi
-AC_SUBST([roff_sysv])
 
 dnl Do not determine page shift at run time by default.
 AC_ARG_ENABLE([dynamic_page_shift],
@@ -828,6 +788,9 @@ AC_MSG_RESULT([LDFLAGS            : ${LDFLAGS}])
 AC_MSG_RESULT([LIBS               : ${LIBS}])
 AC_MSG_RESULT([RPATH_EXTRA        : ${RPATH_EXTRA}])
 AC_MSG_RESULT([])
+AC_MSG_RESULT([XSLTPROC           : ${XSLTPROC}])
+AC_MSG_RESULT([XSLROOT            : ${XSLROOT}])
+AC_MSG_RESULT([])
 AC_MSG_RESULT([PREFIX             : ${PREFIX}])
 AC_MSG_RESULT([BINDIR             : ${BINDIR}])
 AC_MSG_RESULT([INCLUDEDIR         : ${INCLUDEDIR}])

jemalloc/doc/html.xsl.in

@@ -0,0 +1,4 @@
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
+  <xsl:import href="@XSLROOT@/html/docbook.xsl"/>
+  <xsl:import href="@abs_srcroot@doc/stylesheet.xsl"/>
+</xsl:stylesheet>

jemalloc/doc/manpages.xsl.in

@@ -0,0 +1,4 @@
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
+  <xsl:import href="@XSLROOT@/manpages/docbook.xsl"/>
+  <xsl:import href="@abs_srcroot@doc/stylesheet.xsl"/>
+</xsl:stylesheet>

jemalloc/doc/stylesheet.xsl

@@ -0,0 +1,7 @@
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
+  <xsl:param name="funcsynopsis.style">ansi</xsl:param>
+  <xsl:param name="function.parens" select="1"/>
+  <xsl:template match="mallctl">
+    "<xsl:call-template name="inline.monoseq"/>"
+  </xsl:template>
+</xsl:stylesheet>

jemalloc/include/jemalloc/internal/chunk_dss.h

@@ -17,6 +17,7 @@
 extern malloc_mutex_t	dss_mtx;
 
 void	*chunk_alloc_dss(size_t size, bool *zero);
+bool	chunk_in_dss(void *chunk);
 bool	chunk_dealloc_dss(void *chunk, size_t size);
 bool	chunk_dss_boot(void);
 

jemalloc/include/jemalloc/internal/chunk_swap.h

@@ -20,6 +20,7 @@ extern size_t		swap_avail;
 #endif
 
 void	*chunk_alloc_swap(size_t size, bool *zero);
+bool	chunk_in_swap(void *chunk);
 bool	chunk_dealloc_swap(void *chunk, size_t size);
 bool	chunk_swap_enable(const int *fds, unsigned nfds, bool prezeroed);
 bool	chunk_swap_boot(void);

jemalloc/include/jemalloc/internal/huge.h

@@ -25,7 +25,7 @@ void	*huge_ralloc_no_move(void *ptr, size_t oldsize, size_t size,
     size_t extra);
 void	*huge_ralloc(void *ptr, size_t oldsize, size_t size, size_t extra,
     size_t alignment, bool zero);
-void	huge_dalloc(void *ptr);
+void	huge_dalloc(void *ptr, bool unmap);
 size_t	huge_salloc(const void *ptr);
 #ifdef JEMALLOC_PROF
 prof_ctx_t	*huge_prof_ctx_get(const void *ptr);

jemalloc/include/jemalloc/internal/jemalloc_internal.h.in

@@ -666,7 +666,7 @@ idalloc(void *ptr)
 	if (chunk != ptr)
 		arena_dalloc(chunk->arena, chunk, ptr);
 	else
-		huge_dalloc(ptr);
+		huge_dalloc(ptr, true);
 }
 
 JEMALLOC_INLINE void *

jemalloc/include/jemalloc/jemalloc_defs.h.in

@@ -115,6 +115,9 @@
 #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.
  *

jemalloc/src/chunk.c

@@ -146,11 +146,6 @@ chunk_boot(void)
 	chunksize_mask = chunksize - 1;
 	chunk_npages = (chunksize >> PAGE_SHIFT);
 
-#ifdef JEMALLOC_IVSALLOC
-	chunks_rtree = rtree_new((ZU(1) << (LG_SIZEOF_PTR+3)) - opt_lg_chunk);
-	if (chunks_rtree == NULL)
-		return (true);
-#endif
 #if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
 	if (malloc_mutex_init(&chunks_mtx))
 		return (true);
@@ -166,6 +161,11 @@ chunk_boot(void)
 	if (chunk_dss_boot())
 		return (true);
 #endif
+#ifdef JEMALLOC_IVSALLOC
+	chunks_rtree = rtree_new((ZU(1) << (LG_SIZEOF_PTR+3)) - opt_lg_chunk);
+	if (chunks_rtree == NULL)
+		return (true);
+#endif
 
 	return (false);
 }

jemalloc/src/chunk_dss.c

@@ -199,6 +199,22 @@ chunk_dealloc_dss_record(void *chunk, size_t size)
 	return (node);
 }
 
+bool
+chunk_in_dss(void *chunk)
+{
+	bool ret;
+
+	malloc_mutex_lock(&dss_mtx);
+	if ((uintptr_t)chunk >= (uintptr_t)dss_base
+	    && (uintptr_t)chunk < (uintptr_t)dss_max)
+		ret = true;
+	else
+		ret = false;
+	malloc_mutex_unlock(&dss_mtx);
+
+	return (ret);
+}
+
 bool
 chunk_dealloc_dss(void *chunk, size_t size)
 {

jemalloc/src/chunk_swap.c

@@ -184,6 +184,24 @@ chunk_dealloc_swap_record(void *chunk, size_t size)
 	return (node);
 }
 
+bool
+chunk_in_swap(void *chunk)
+{
+	bool ret;
+
+	assert(swap_enabled);
+
+	malloc_mutex_lock(&swap_mtx);
+	if ((uintptr_t)chunk >= (uintptr_t)swap_base
+	    && (uintptr_t)chunk < (uintptr_t)swap_max)
+		ret = true;
+	else
+		ret = false;
+	malloc_mutex_unlock(&swap_mtx);
+
+	return (ret);
+}
+
 bool
 chunk_dealloc_swap(void *chunk, size_t size)
 {
@@ -219,15 +237,15 @@ chunk_dealloc_swap(void *chunk, size_t size)
 		} else
 			madvise(chunk, size, MADV_DONTNEED);
 
+#ifdef JEMALLOC_STATS
+		swap_avail += size;
+#endif
 		ret = false;
 		goto RETURN;
 	}
 
 	ret = true;
 RETURN:
-#ifdef JEMALLOC_STATS
-	swap_avail += size;
-#endif
 	malloc_mutex_unlock(&swap_mtx);
 	return (ret);
 }

jemalloc/src/ctl.c

@@ -4,6 +4,13 @@
 /******************************************************************************/
 /* Data. */
 
+/*
+ * ctl_mtx protects the following:
+ * - ctl_stats.*
+ * - opt_prof_active
+ * - swap_enabled
+ * - swap_prezeroed
+ */
 static malloc_mutex_t	ctl_mtx;
 static bool		ctl_initialized;
 static uint64_t		ctl_epoch;
@@ -44,7 +51,9 @@ CTL_PROTO(tcache_flush)
 CTL_PROTO(thread_arena)
 #ifdef JEMALLOC_STATS
 CTL_PROTO(thread_allocated)
+CTL_PROTO(thread_allocatedp)
 CTL_PROTO(thread_deallocated)
+CTL_PROTO(thread_deallocatedp)
 #endif
 CTL_PROTO(config_debug)
 CTL_PROTO(config_dss)
@@ -223,7 +232,9 @@ static const ctl_node_t	thread_node[] = {
 #ifdef JEMALLOC_STATS
 	,
 	{NAME("allocated"),	CTL(thread_allocated)},
-	{NAME("deallocated"),	CTL(thread_deallocated)}
+	{NAME("allocatedp"),	CTL(thread_allocatedp)},
+	{NAME("deallocated"),	CTL(thread_deallocated)},
+	{NAME("deallocatedp"),	CTL(thread_deallocatedp)}
 #endif
 };
 
@@ -680,7 +691,9 @@ ctl_refresh(void)
 static bool
 ctl_init(void)
 {
+	bool ret;
 
+	malloc_mutex_lock(&ctl_mtx);
 	if (ctl_initialized == false) {
 #ifdef JEMALLOC_STATS
 		unsigned i;
@@ -692,8 +705,10 @@ ctl_init(void)
 		 */
 		ctl_stats.arenas = (ctl_arena_stats_t *)base_alloc(
 		    (narenas + 1) * sizeof(ctl_arena_stats_t));
-		if (ctl_stats.arenas == NULL)
+		if (ctl_stats.arenas == NULL) {
-			return (true);
+			ret = true;
+			goto RETURN;
+		}
 		memset(ctl_stats.arenas, 0, (narenas + 1) *
 		    sizeof(ctl_arena_stats_t));
 
@@ -704,8 +719,10 @@ ctl_init(void)
 		 */
 #ifdef JEMALLOC_STATS
 		for (i = 0; i <= narenas; i++) {
-			if (ctl_arena_init(&ctl_stats.arenas[i]))
+			if (ctl_arena_init(&ctl_stats.arenas[i])) {
-				return (true);
+				ret = true;
+				goto RETURN;
+			}
 		}
 #endif
 		ctl_stats.arenas[narenas].initialized = true;
@@ -715,7 +732,10 @@ ctl_init(void)
 		ctl_initialized = true;
 	}
 
-	return (false);
+	ret = false;
+RETURN:
+	malloc_mutex_unlock(&ctl_mtx);
+	return (ret);
 }
 
 static int
@@ -825,8 +845,7 @@ ctl_byname(const char *name, void *oldp, size_t *oldlenp, void *newp,
 	ctl_node_t const *nodes[CTL_MAX_DEPTH];
 	size_t mib[CTL_MAX_DEPTH];
 
-	malloc_mutex_lock(&ctl_mtx);
+	if (ctl_initialized == false && ctl_init()) {
-	if (ctl_init()) {
 		ret = EAGAIN;
 		goto RETURN;
 	}
@@ -841,10 +860,9 @@ ctl_byname(const char *name, void *oldp, size_t *oldlenp, void *newp,
 		ret = ENOENT;
 		goto RETURN;
 	}
-	ret = nodes[depth-1]->ctl(mib, depth, oldp, oldlenp, newp, newlen);
 
+	ret = nodes[depth-1]->ctl(mib, depth, oldp, oldlenp, newp, newlen);
 RETURN:
-	malloc_mutex_unlock(&ctl_mtx);
 	return(ret);
 }
 
@@ -853,16 +871,13 @@ ctl_nametomib(const char *name, size_t *mibp, size_t *miblenp)
 {
 	int ret;
 
-	malloc_mutex_lock(&ctl_mtx);
+	if (ctl_initialized == false && ctl_init()) {
-	if (ctl_init()) {
 		ret = EAGAIN;
 		goto RETURN;
 	}
 
 	ret = ctl_lookup(name, NULL, mibp, miblenp);
-
 RETURN:
-	malloc_mutex_unlock(&ctl_mtx);
 	return(ret);
 }
 
@@ -874,8 +889,7 @@ ctl_bymib(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 	const ctl_node_t *node;
 	size_t i;
 
-	malloc_mutex_lock(&ctl_mtx);
+	if (ctl_initialized == false && ctl_init()) {
-	if (ctl_init()) {
 		ret = EAGAIN;
 		goto RETURN;
 	}
@@ -912,7 +926,6 @@ ctl_bymib(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 	ret = node->ctl(mib, miblen, oldp, oldlenp, newp, newlen);
 
 RETURN:
-	malloc_mutex_unlock(&ctl_mtx);
 	return(ret);
 }
 
@@ -975,6 +988,29 @@ ctl_boot(void)
 
 #define	CTL_RO_GEN(n, v, t)						\
 static int								\
+n##_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,	\
+    void *newp, size_t newlen)						\
+{									\
+	int ret;							\
+	t oldval;							\
+									\
+	malloc_mutex_lock(&ctl_mtx);					\
+	READONLY();							\
+	oldval = v;							\
+	READ(oldval, t);						\
+									\
+	ret = 0;							\
+RETURN:									\
+	malloc_mutex_unlock(&ctl_mtx);					\
+	return (ret);							\
+}
+
+/*
+ * ctl_mtx is not acquired, under the assumption that no pertinent data will
+ * mutate during the call.
+ */
+#define	CTL_RO_NL_GEN(n, v, t)					\
+static int								\
 n##_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,	\
     void *newp, size_t newlen)						\
 {									\
@@ -1024,7 +1060,7 @@ RETURN:									\
 	return (ret);							\
 }
 
-CTL_RO_GEN(version, JEMALLOC_VERSION, const char *)
+CTL_RO_NL_GEN(version, JEMALLOC_VERSION, const char *)
 
 static int
 epoch_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
@@ -1033,6 +1069,7 @@ epoch_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 	int ret;
 	uint64_t newval;
 
+	malloc_mutex_lock(&ctl_mtx);
 	newval = 0;
 	WRITE(newval, uint64_t);
 	if (newval != 0)
@@ -1041,6 +1078,7 @@ epoch_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 
 	ret = 0;
 RETURN:
+	malloc_mutex_unlock(&ctl_mtx);
 	return (ret);
 }
 
@@ -1107,8 +1145,10 @@ RETURN:
 }
 
 #ifdef JEMALLOC_STATS
-CTL_RO_GEN(thread_allocated, ALLOCATED_GET(), uint64_t);
+CTL_RO_NL_GEN(thread_allocated, ALLOCATED_GET(), uint64_t);
-CTL_RO_GEN(thread_deallocated, DEALLOCATED_GET(), uint64_t);
+CTL_RO_NL_GEN(thread_allocatedp, &ALLOCATED_GET(), uint64_t *);
+CTL_RO_NL_GEN(thread_deallocated, DEALLOCATED_GET(), uint64_t);
+CTL_RO_NL_GEN(thread_deallocatedp, &DEALLOCATED_GET(), uint64_t *);
 #endif
 
 /******************************************************************************/
@@ -1205,48 +1245,48 @@ CTL_RO_FALSE_GEN(config_xmalloc)
 
 /******************************************************************************/
 
-CTL_RO_GEN(opt_abort, opt_abort, bool)
+CTL_RO_NL_GEN(opt_abort, opt_abort, bool)
-CTL_RO_GEN(opt_lg_qspace_max, opt_lg_qspace_max, size_t)
+CTL_RO_NL_GEN(opt_lg_qspace_max, opt_lg_qspace_max, size_t)
-CTL_RO_GEN(opt_lg_cspace_max, opt_lg_cspace_max, size_t)
+CTL_RO_NL_GEN(opt_lg_cspace_max, opt_lg_cspace_max, size_t)
-CTL_RO_GEN(opt_lg_chunk, opt_lg_chunk, size_t)
+CTL_RO_NL_GEN(opt_lg_chunk, opt_lg_chunk, size_t)
-CTL_RO_GEN(opt_narenas, opt_narenas, size_t)
+CTL_RO_NL_GEN(opt_narenas, opt_narenas, size_t)
-CTL_RO_GEN(opt_lg_dirty_mult, opt_lg_dirty_mult, ssize_t)
+CTL_RO_NL_GEN(opt_lg_dirty_mult, opt_lg_dirty_mult, ssize_t)
-CTL_RO_GEN(opt_stats_print, opt_stats_print, bool)
+CTL_RO_NL_GEN(opt_stats_print, opt_stats_print, bool)
 #ifdef JEMALLOC_FILL
-CTL_RO_GEN(opt_junk, opt_junk, bool)
+CTL_RO_NL_GEN(opt_junk, opt_junk, bool)
-CTL_RO_GEN(opt_zero, opt_zero, bool)
+CTL_RO_NL_GEN(opt_zero, opt_zero, bool)
 #endif
 #ifdef JEMALLOC_SYSV
-CTL_RO_GEN(opt_sysv, opt_sysv, bool)
+CTL_RO_NL_GEN(opt_sysv, opt_sysv, bool)
 #endif
 #ifdef JEMALLOC_XMALLOC
-CTL_RO_GEN(opt_xmalloc, opt_xmalloc, bool)
+CTL_RO_NL_GEN(opt_xmalloc, opt_xmalloc, bool)
 #endif
 #ifdef JEMALLOC_TCACHE
-CTL_RO_GEN(opt_tcache, opt_tcache, bool)
+CTL_RO_NL_GEN(opt_tcache, opt_tcache, bool)
-CTL_RO_GEN(opt_lg_tcache_gc_sweep, opt_lg_tcache_gc_sweep, ssize_t)
+CTL_RO_NL_GEN(opt_lg_tcache_gc_sweep, opt_lg_tcache_gc_sweep, ssize_t)
 #endif
 #ifdef JEMALLOC_PROF
-CTL_RO_GEN(opt_prof, opt_prof, bool)
+CTL_RO_NL_GEN(opt_prof, opt_prof, bool)
-CTL_RO_GEN(opt_prof_prefix, opt_prof_prefix, const char *)
+CTL_RO_NL_GEN(opt_prof_prefix, opt_prof_prefix, const char *)
-CTL_RO_GEN(opt_prof_active, opt_prof_active, bool)
+CTL_RO_GEN(opt_prof_active, opt_prof_active, bool) /* Mutable. */
-CTL_RO_GEN(opt_lg_prof_bt_max, opt_lg_prof_bt_max, size_t)
+CTL_RO_NL_GEN(opt_lg_prof_bt_max, opt_lg_prof_bt_max, size_t)
-CTL_RO_GEN(opt_lg_prof_sample, opt_lg_prof_sample, size_t)
+CTL_RO_NL_GEN(opt_lg_prof_sample, opt_lg_prof_sample, size_t)
-CTL_RO_GEN(opt_lg_prof_interval, opt_lg_prof_interval, ssize_t)
+CTL_RO_NL_GEN(opt_lg_prof_interval, opt_lg_prof_interval, ssize_t)
-CTL_RO_GEN(opt_prof_gdump, opt_prof_gdump, bool)
+CTL_RO_NL_GEN(opt_prof_gdump, opt_prof_gdump, bool)
-CTL_RO_GEN(opt_prof_leak, opt_prof_leak, bool)
+CTL_RO_NL_GEN(opt_prof_leak, opt_prof_leak, bool)
-CTL_RO_GEN(opt_prof_accum, opt_prof_accum, bool)
+CTL_RO_NL_GEN(opt_prof_accum, opt_prof_accum, bool)
-CTL_RO_GEN(opt_lg_prof_tcmax, opt_lg_prof_tcmax, ssize_t)
+CTL_RO_NL_GEN(opt_lg_prof_tcmax, opt_lg_prof_tcmax, ssize_t)
 #endif
 #ifdef JEMALLOC_SWAP
-CTL_RO_GEN(opt_overcommit, opt_overcommit, bool)
+CTL_RO_NL_GEN(opt_overcommit, opt_overcommit, bool)
 #endif
 
 /******************************************************************************/
 
-CTL_RO_GEN(arenas_bin_i_size, arenas[0]->bins[mib[2]].reg_size, size_t)
+CTL_RO_NL_GEN(arenas_bin_i_size, arenas[0]->bins[mib[2]].reg_size, size_t)
-CTL_RO_GEN(arenas_bin_i_nregs, arenas[0]->bins[mib[2]].nregs, uint32_t)
+CTL_RO_NL_GEN(arenas_bin_i_nregs, arenas[0]->bins[mib[2]].nregs, uint32_t)
-CTL_RO_GEN(arenas_bin_i_run_size, arenas[0]->bins[mib[2]].run_size, size_t)
+CTL_RO_NL_GEN(arenas_bin_i_run_size, arenas[0]->bins[mib[2]].run_size, size_t)
 const ctl_node_t *
 arenas_bin_i_index(const size_t *mib, size_t miblen, size_t i)
 {
@@ -1256,7 +1296,7 @@ arenas_bin_i_index(const size_t *mib, size_t miblen, size_t i)
 	return (super_arenas_bin_i_node);
 }
 
-CTL_RO_GEN(arenas_lrun_i_size, ((mib[2]+1) << PAGE_SHIFT), size_t)
+CTL_RO_NL_GEN(arenas_lrun_i_size, ((mib[2]+1) << PAGE_SHIFT), size_t)
 const ctl_node_t *
 arenas_lrun_i_index(const size_t *mib, size_t miblen, size_t i)
 {
@@ -1266,7 +1306,7 @@ arenas_lrun_i_index(const size_t *mib, size_t miblen, size_t i)
 	return (super_arenas_lrun_i_node);
 }
 
-CTL_RO_GEN(arenas_narenas, narenas, unsigned)
+CTL_RO_NL_GEN(arenas_narenas, narenas, unsigned)
 
 static int
 arenas_initialized_ctl(const size_t *mib, size_t miblen, void *oldp,
@@ -1275,6 +1315,7 @@ arenas_initialized_ctl(const size_t *mib, size_t miblen, void *oldp,
 	int ret;
 	unsigned nread, i;
 
+	malloc_mutex_lock(&ctl_mtx);
 	READONLY();
 	if (*oldlenp != narenas * sizeof(bool)) {
 		ret = EINVAL;
@@ -1289,36 +1330,37 @@ arenas_initialized_ctl(const size_t *mib, size_t miblen, void *oldp,
 		((bool *)oldp)[i] = ctl_stats.arenas[i].initialized;
 
 RETURN:
+	malloc_mutex_unlock(&ctl_mtx);
 	return (ret);
 }
 
-CTL_RO_GEN(arenas_quantum, QUANTUM, size_t)
+CTL_RO_NL_GEN(arenas_quantum, QUANTUM, size_t)
-CTL_RO_GEN(arenas_cacheline, CACHELINE, size_t)
+CTL_RO_NL_GEN(arenas_cacheline, CACHELINE, size_t)
-CTL_RO_GEN(arenas_subpage, SUBPAGE, size_t)
+CTL_RO_NL_GEN(arenas_subpage, SUBPAGE, size_t)
-CTL_RO_GEN(arenas_pagesize, PAGE_SIZE, size_t)
+CTL_RO_NL_GEN(arenas_pagesize, PAGE_SIZE, size_t)
-CTL_RO_GEN(arenas_chunksize, chunksize, size_t)
+CTL_RO_NL_GEN(arenas_chunksize, chunksize, size_t)
 #ifdef JEMALLOC_TINY
-CTL_RO_GEN(arenas_tspace_min, (1U << LG_TINY_MIN), size_t)
+CTL_RO_NL_GEN(arenas_tspace_min, (1U << LG_TINY_MIN), size_t)
-CTL_RO_GEN(arenas_tspace_max, (qspace_min >> 1), size_t)
+CTL_RO_NL_GEN(arenas_tspace_max, (qspace_min >> 1), size_t)
 #endif
-CTL_RO_GEN(arenas_qspace_min, qspace_min, size_t)
+CTL_RO_NL_GEN(arenas_qspace_min, qspace_min, size_t)
-CTL_RO_GEN(arenas_qspace_max, qspace_max, size_t)
+CTL_RO_NL_GEN(arenas_qspace_max, qspace_max, size_t)
-CTL_RO_GEN(arenas_cspace_min, cspace_min, size_t)
+CTL_RO_NL_GEN(arenas_cspace_min, cspace_min, size_t)
-CTL_RO_GEN(arenas_cspace_max, cspace_max, size_t)
+CTL_RO_NL_GEN(arenas_cspace_max, cspace_max, size_t)
-CTL_RO_GEN(arenas_sspace_min, sspace_min, size_t)
+CTL_RO_NL_GEN(arenas_sspace_min, sspace_min, size_t)
-CTL_RO_GEN(arenas_sspace_max, sspace_max, size_t)
+CTL_RO_NL_GEN(arenas_sspace_max, sspace_max, size_t)
 #ifdef JEMALLOC_TCACHE
-CTL_RO_GEN(arenas_tcache_max, tcache_maxclass, size_t)
+CTL_RO_NL_GEN(arenas_tcache_max, tcache_maxclass, size_t)
 #endif
-CTL_RO_GEN(arenas_ntbins, ntbins, unsigned)
+CTL_RO_NL_GEN(arenas_ntbins, ntbins, unsigned)
-CTL_RO_GEN(arenas_nqbins, nqbins, unsigned)
+CTL_RO_NL_GEN(arenas_nqbins, nqbins, unsigned)
-CTL_RO_GEN(arenas_ncbins, ncbins, unsigned)
+CTL_RO_NL_GEN(arenas_ncbins, ncbins, unsigned)
-CTL_RO_GEN(arenas_nsbins, nsbins, unsigned)
+CTL_RO_NL_GEN(arenas_nsbins, nsbins, unsigned)
-CTL_RO_GEN(arenas_nbins, nbins, unsigned)
+CTL_RO_NL_GEN(arenas_nbins, nbins, unsigned)
 #ifdef JEMALLOC_TCACHE
-CTL_RO_GEN(arenas_nhbins, nhbins, unsigned)
+CTL_RO_NL_GEN(arenas_nhbins, nhbins, unsigned)
 #endif
-CTL_RO_GEN(arenas_nlruns, nlclasses, size_t)
+CTL_RO_NL_GEN(arenas_nlruns, nlclasses, size_t)
 
 static int
 arenas_purge_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
@@ -1368,6 +1410,7 @@ prof_active_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 	int ret;
 	bool oldval;
 
+	malloc_mutex_lock(&ctl_mtx); /* Protect opt_prof_active. */
 	oldval = opt_prof_active;
 	if (newp != NULL) {
 		/*
@@ -1382,6 +1425,7 @@ prof_active_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 
 	ret = 0;
 RETURN:
+	malloc_mutex_unlock(&ctl_mtx);
 	return (ret);
 }
 
@@ -1405,7 +1449,7 @@ RETURN:
 	return (ret);
 }
 
-CTL_RO_GEN(prof_interval, prof_interval, uint64_t)
+CTL_RO_NL_GEN(prof_interval, prof_interval, uint64_t)
 #endif
 
 /******************************************************************************/
@@ -1503,10 +1547,18 @@ CTL_RO_GEN(stats_arenas_i_purged, ctl_stats.arenas[mib[2]].astats.purged,
 const ctl_node_t *
 stats_arenas_i_index(const size_t *mib, size_t miblen, size_t i)
 {
+	const ctl_node_t * ret;
 
-	if (ctl_stats.arenas[i].initialized == false)
+	malloc_mutex_lock(&ctl_mtx);
-		return (NULL);
+	if (ctl_stats.arenas[i].initialized == false) {
-	return (super_stats_arenas_i_node);
+		ret = NULL;
+		goto RETURN;
+	}
+
+	ret = super_stats_arenas_i_node;
+RETURN:
+	malloc_mutex_unlock(&ctl_mtx);
+	return (ret);
 }
 
 #ifdef JEMALLOC_STATS
@@ -1528,6 +1580,7 @@ swap_prezeroed_ctl(const size_t *mib, size_t miblen, void *oldp,
 {
 	int ret;
 
+	malloc_mutex_lock(&ctl_mtx);
 	if (swap_enabled) {
 		READONLY();
 	} else {
@@ -1545,6 +1598,7 @@ swap_prezeroed_ctl(const size_t *mib, size_t miblen, void *oldp,
 
 	ret = 0;
 RETURN:
+	malloc_mutex_unlock(&ctl_mtx);
 	return (ret);
 }
 
@@ -1556,6 +1610,7 @@ swap_fds_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 {
 	int ret;
 
+	malloc_mutex_lock(&ctl_mtx);
 	if (swap_enabled) {
 		READONLY();
 	} else if (newp != NULL) {
@@ -1586,6 +1641,7 @@ swap_fds_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 
 	ret = 0;
 RETURN:
+	malloc_mutex_unlock(&ctl_mtx);
 	return (ret);
 }
 #endif

jemalloc/src/huge.c

@@ -215,13 +215,56 @@ huge_ralloc(void *ptr, size_t oldsize, size_t size, size_t extra,
 	 * expectation that the extra bytes will be reliably preserved.
 	 */
 	copysize = (size < oldsize) ? size : oldsize;
-	memcpy(ret, ptr, copysize);
+
-	idalloc(ptr);
+	/*
+	 * Use mremap(2) if this is a huge-->huge reallocation, and neither the
+	 * source nor the destination are in swap or dss.
+	 */
+#ifdef JEMALLOC_MREMAP_FIXED
+	if (oldsize >= chunksize
+#  ifdef JEMALLOC_SWAP
+	    && (swap_enabled == false || (chunk_in_swap(ptr) == false &&
+	    chunk_in_swap(ret) == false))
+#  endif
+#  ifdef JEMALLOC_DSS
+	    && chunk_in_dss(ptr) == false && chunk_in_dss(ret) == false
+#  endif
+	    ) {
+		size_t newsize = huge_salloc(ret);
+
+		if (mremap(ptr, oldsize, newsize, MREMAP_MAYMOVE|MREMAP_FIXED,
+		    ret) == MAP_FAILED) {
+			/*
+			 * Assuming no chunk management bugs in the allocator,
+			 * the only documented way an error can occur here is
+			 * if the application changed the map type for a
+			 * portion of the old allocation.  This is firmly in
+			 * undefined behavior territory, so write a diagnostic
+			 * message, and optionally abort.
+			 */
+			char buf[BUFERROR_BUF];
+
+			buferror(errno, buf, sizeof(buf));
+			malloc_write("<jemalloc>: Error in mremap(): ");
+			malloc_write(buf);
+			malloc_write("\n");
+			if (opt_abort)
+				abort();
+			memcpy(ret, ptr, copysize);
+			idalloc(ptr);
+		} else
+			huge_dalloc(ptr, false);
+	} else
+#endif
+	{
+		memcpy(ret, ptr, copysize);
+		idalloc(ptr);
+	}
 	return (ret);
 }
 
 void
-huge_dalloc(void *ptr)
+huge_dalloc(void *ptr, bool unmap)
 {
 	extent_node_t *node, key;
 
@@ -241,14 +284,16 @@ huge_dalloc(void *ptr)
 
 	malloc_mutex_unlock(&huge_mtx);
 
+	if (unmap) {
 	/* Unmap chunk. */
 #ifdef JEMALLOC_FILL
 #if (defined(JEMALLOC_SWAP) || defined(JEMALLOC_DSS))
-	if (opt_junk)
+		if (opt_junk)
-		memset(node->addr, 0x5a, node->size);
+			memset(node->addr, 0x5a, node->size);
 #endif
 #endif
-	chunk_dealloc(node->addr, node->size);
+		chunk_dealloc(node->addr, node->size);
+	}
 
 	base_node_dealloc(node);
 }

jemalloc/test/mremap.c

@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+#define	JEMALLOC_MANGLE
+#include "jemalloc_test.h"
+
+int
+main(void)
+{
+	int ret, err;
+	size_t sz, lg_chunk, chunksize, i;
+	char *p, *q;
+
+	fprintf(stderr, "Test begin\n");
+
+	sz = sizeof(lg_chunk);
+	if ((err = JEMALLOC_P(mallctl)("opt.lg_chunk", &lg_chunk, &sz, NULL,
+	    0))) {
+		assert(err != ENOENT);
+		fprintf(stderr, "%s(): Error in mallctl(): %s\n", __func__,
+		    strerror(err));
+		ret = 1;
+		goto RETURN;
+	}
+	chunksize = ((size_t)1U) << lg_chunk;
+
+	p = (char *)malloc(chunksize);
+	if (p == NULL) {
+		fprintf(stderr, "malloc(%zu) --> %p\n", chunksize, p);
+		ret = 1;
+		goto RETURN;
+	}
+	memset(p, 'a', chunksize);
+
+	q = (char *)realloc(p, chunksize * 2);
+	if (q == NULL) {
+		fprintf(stderr, "realloc(%p, %zu) --> %p\n", p, chunksize * 2,
+		    q);
+		ret = 1;
+		goto RETURN;
+	}
+	for (i = 0; i < chunksize; i++) {
+		assert(q[i] == 'a');
+	}
+
+	p = q;
+
+	q = (char *)realloc(p, chunksize);
+	if (q == NULL) {
+		fprintf(stderr, "realloc(%p, %zu) --> %p\n", p, chunksize, q);
+		ret = 1;
+		goto RETURN;
+	}
+	for (i = 0; i < chunksize; i++) {
+		assert(q[i] == 'a');
+	}
+
+	free(q);
+
+	ret = 0;
+RETURN:
+	fprintf(stderr, "Test end\n");
+	return (ret);
+}

jemalloc/test/mremap.exp

@@ -0,0 +1,2 @@
+Test begin
+Test end