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Qi Wang d66f976628 Optimize large deallocation. 
We eagerly coalesce large buffers when deallocating, however the previous logic
around this introduced extra lock overhead -- when coalescing we always lock the
neighbors even if they are active, while for active extents nothing can be done.

This commit checks if the neighbor extents are potentially active before
locking, and avoids locking if possible.  This speeds up large_dalloc by ~20%.
It also fixes some undesired behavior: we could stop coalescing because a small
buffer was merged, while a large neighbor was ignored on the other side.
2018-11-08 13:35:59 -08:00
bin Filter out "void *newImpl" in prof output. 2017-08-08 12:28:29 -07:00
build-aux Update config.{guess,sub} from upstream. 2016-11-10 15:08:32 -08:00
doc Add stats for the size of extent_avail heap 2018-08-02 10:16:06 -07:00
include Restrict lwsync to powerpc64 only 2018-10-24 11:18:55 -07:00
m4 jemalloc cpp new/delete bindings 2016-12-12 18:36:06 -08:00
msvc Add sc.c to the MSVC project 2018-09-04 12:58:05 -07:00
scripts Test smallocx on Travis-CI 2018-10-17 07:12:28 -07:00
src Optimize large deallocation. 2018-11-08 13:35:59 -08:00
test add test for zero-sized alloc and aligned alloc 2018-10-17 08:50:58 -07:00
.appveyor.yml Revert "CI: Remove "catgets" dependency on appveyor." 2018-03-15 13:58:42 -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 Kill size_classes.sh. 2018-07-12 20:53:06 -07:00
.travis.yml Test smallocx on Travis-CI 2018-10-17 07:12:28 -07:00
autogen.sh Move repo contents in jemalloc/ to top level. 2011-03-31 20:36:17 -07:00
ChangeLog Update ChangeLog for 5.1.0. 2018-05-08 12:06:34 -07:00
config.stamp.in Move repo contents in jemalloc/ to top level. 2011-03-31 20:36:17 -07:00
configure.ac Make smallocx symbol name depend on the JEMALLOC_VERSION_GID 2018-10-17 07:12:28 -07:00
COPYING Update copyright dates. 2018-05-03 15:31:42 -07:00
INSTALL.md Remove the --with-lg-page-sizes configure option. 2018-07-12 20:53:06 -07:00
jemalloc.pc.in Reformat the version number in jemalloc.pc.in. 2018-05-07 20:12:03 -07:00
Makefile.in add test for zero-sized alloc and aligned alloc 2018-10-17 08:50:58 -07:00
README Update project URL. 2016-09-12 11:56:24 -07:00
run_tests.sh Introduce scripts to run all possible tests 2017-01-30 17:51:57 -08:00
TUNING.md Add TUNING.md. 2018-05-03 12:52:52 -07:00

README 

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 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://jemalloc.net/