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Jason Evans d419bb09ef Fix and simplify decay-based purging.
Simplify decay-based purging attempts to only be triggered when the
epoch is advanced, rather than every time purgeable memory increases.
In a correctly functioning system (not previously the case; see below),
this only causes a behavior difference if during subsequent purge
attempts the least recently used (LRU) purgeable memory extent is
initially too large to be purged, but that memory is reused between
attempts and one or more of the next LRU purgeable memory extents are
small enough to be purged.  In practice this is an arbitrary behavior
change that is within the set of acceptable behaviors.

As for the purging fix, assure that arena->decay.ndirty is recorded
*after* the epoch advance and associated purging occurs.  Prior to this
fix, it was possible for purging during epoch advance to cause a
substantially underrepresentative (arena->ndirty - arena->decay.ndirty),
i.e. the number of dirty pages attributed to the current epoch was too
low, and a series of unintended purges could result.  This fix is also
relevant in the context of the simplification described above, but the
bug's impact would be limited to over-purging at epoch advances.
2016-10-11 15:50:05 -07:00
bin Pass retain and exclude parameters to /pprof/symbol. 2016-01-29 19:59:06 -08:00
build-aux Use AC_CONFIG_AUX_DIR([build-aux]). 2015-11-12 11:23:39 -08:00
doc Change html manual encoding to UTF-8. 2016-09-12 16:44:33 -07:00
include Fix and simplify decay-based purging. 2016-10-11 15:50:05 -07:00
msvc Readme.txt error for building in the Windows 2016-09-26 15:35:30 -07:00
src Fix and simplify decay-based purging. 2016-10-11 15:50:05 -07:00
test Fix decay tests to all adapt to nstime_monotonic(). 2016-10-11 15:49:55 -07:00
.appveyor.yml Add an AppVeyor config 2016-09-26 15:47:41 -07:00
.autom4te.cfg Disable autom4te cache. 2014-09-02 17:49:29 -07:00
.gitattributes fix git handling of newlines on windows 2014-05-07 18:48:39 -04:00
.gitignore Add MS Visual Studio 2015 support 2016-02-20 10:55:23 -08:00
.travis.yml Add Travis-CI configuration 2016-09-26 15:47:29 -07:00
autogen.sh Move repo contents in jemalloc/ to top level. 2011-03-31 20:36:17 -07:00
ChangeLog Fix a typo. 2016-10-04 15:56:26 -07:00
config.stamp.in Move repo contents in jemalloc/ to top level. 2011-03-31 20:36:17 -07:00
configure.ac Refine nstime_update(). 2016-10-10 11:40:46 -07:00
COPYING Update copyright dates for 2016. 2016-02-28 15:20:40 -08:00
coverage.sh Add test code coverage analysis. 2013-12-06 18:50:51 -08:00
INSTALL Add --with-version. 2016-03-14 20:19:11 -07:00
jemalloc.pc.in Take into account the install suffix that jemalloc was built with in the pkg-config file. 2015-02-13 12:46:19 -08:00
Makefile.in use install command determined by configure 2016-09-26 15:43:07 -07:00
README Update README. 2013-10-20 19:38:19 -07:00

jemalloc is a general purpose malloc(3) implementation that emphasizes
fragmentation avoidance and scalable concurrency support.  jemalloc first came
into use as the FreeBSD libc allocator in 2005, and since then it has found its
way into numerous applications that rely on its predictable behavior.  In 2010
jemalloc development efforts broadened to include developer support features
such as heap profiling, Valgrind integration, and extensive monitoring/tuning
hooks.  Modern jemalloc releases continue to be integrated back into FreeBSD,
and therefore versatility remains critical.  Ongoing development efforts trend
toward making jemalloc among the best allocators for a broad range of demanding
applications, and eliminating/mitigating weaknesses that have practical
repercussions for real world applications.

The COPYING file contains copyright and licensing information.

The INSTALL file contains information on how to configure, build, and install
jemalloc.

The ChangeLog file contains a brief summary of changes for each release.

URL: http://www.canonware.com/jemalloc/