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David Goldblatt 0f6c420f83 HPA: Make purging/hugifying more principled.
Before this change, purge/hugify decisions had several sharp edges that could
lead to pathological behavior if tuning parameters weren't carefully chosen.
It's the first of a series; this introduces basic "make every hugepage with
dirty pages purgeable" functionality, and the next commit expands that
functionality to have a smarter policy for picking hugepages to purge.

Previously, the dehugify logic would *never* dehugify a hugepage unless it was
dirtier than the dehugification threshold.  This can lead to situations in which
these pages (which themselves could never be purged) would push us above the
maximum allowed dirty pages in the shard.  This forces immediate purging of any
pages deallocated in non-hugified hugepages, which in turn places nonobvious
practical limitations on the relationships between various config settings.

Instead, we make our preference not to dehugify to purge a soft one rather than
a hard one.  We'll avoid purging them, but only so long as we can do so by
purging non-hugified pages.  If we need to purge them to satisfy our dirty page
limits, or to hugify other, more worthy candidates, we'll still do so.
2021-02-19 15:10:54 -08:00
bin Backport jeprof --collapse for flamegraph generation 2020-12-04 10:48:21 -08:00
build-aux Update config.{sub,guess} to support support-aarch64-apple-darwin as a target 2021-01-11 14:00:03 -08:00
doc Implement opt.cache_oblivious. 2021-02-11 11:32:01 -08:00
doc_internal Add a logo to doc_internal. 2020-10-19 15:32:51 -07:00
include HPA: Make purging/hugifying more principled. 2021-02-19 15:10:54 -08:00
m4 Support C++17 over-aligned allocation 2019-11-22 10:14:16 -08:00
msvc PAI/SEC: Add a dalloc_batch function. 2021-02-19 15:10:54 -08:00
scripts Add a script to check for clang-formattedness. 2020-10-02 14:49:56 -07:00
src HPA: Make purging/hugifying more principled. 2021-02-19 15:10:54 -08:00
test Edata: Move sn into its own field. 2021-02-19 15:10:54 -08:00
.appveyor.yml Appveyor: fix 404 errors. 2020-10-27 15:28:20 -07:00
.autom4te.cfg Disable autom4te cache. 2014-09-02 17:49:29 -07:00
.cirrus.yml Cirrus-CI: test on new freebsd releases. 2020-02-23 20:43:38 -08:00
.clang-format Add a .clang-format file. 2020-10-02 14:49:56 -07:00
.gitattributes fix git handling of newlines on windows 2014-05-07 18:48:39 -04:00
.gitignore Add PROFILING_INTERNALS.md 2020-09-10 15:56:59 -07:00
.travis.yml CI support for PPC64LE architecture 2020-09-17 10:03:08 -07:00
autogen.sh Move repo contents in jemalloc/ to top level. 2011-03-31 20:36:17 -07:00
ChangeLog Update Changelog for 5.2.1. 2019-08-05 12:52:43 -07:00
config.stamp.in Move repo contents in jemalloc/ to top level. 2011-03-31 20:36:17 -07:00
configure.ac Mac OS: Tag mapped pages. 2021-02-03 15:05:53 -08:00
COPYING Update copyright dates. 2019-01-25 13:25:20 -08:00
INSTALL.md Update INSTALL.md to mention 'autoconf' 2021-02-16 17:48:46 -08:00
jemalloc.pc.in Reformat the version number in jemalloc.pc.in. 2018-05-07 20:12:03 -07:00
Makefile.in PAI/SEC: Add a dalloc_batch function. 2021-02-19 15:10:54 -08:00
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

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/