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The systemd System and Service Manager

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Vito Caputo b439282e0b journal: avoid unnecessary mmap_cache_get() calls journal_file_move_to_object() can skip the second journal_file_move_to() call if the first one already mapped a sufficiently large area. Now that mmap_cache_get() returns the size of the mapped area when asked, ask for the size and only perform the second call if the required size exceeds the mapped size instead of the object header size. This results in a nice performance boost in my testing, even with a corpus of many small logs burning much CPU time elsewhere: Before: # time ./journalctl -b -1 --no-pager > /dev/null real 0m16.330s user 0m16.281s sys 0m0.046s # time ./journalctl -b -1 --no-pager > /dev/null real 0m16.409s user 0m16.358s sys 0m0.048s # time ./journalctl -b -1 --no-pager > /dev/null real 0m16.625s user 0m16.558s sys 0m0.061s After: # time ./journalctl -b -1 --no-pager > /dev/null real 0m15.311s user 0m15.257s sys 0m0.046s # time ./journalctl -b -1 --no-pager > /dev/null real 0m15.201s user 0m15.135s sys 0m0.062s # time ./journalctl -b -1 --no-pager > /dev/null real 0m15.170s user 0m15.113s sys 0m0.053s		2017-07-12 23:59:29 -07:00
.github	github: how to report bugs for older distribution versions (#6146 )	2017-06-20 20:20:25 +02:00
.mkosi	Merge pull request #6176 from poettering/timer-boottime-monotonic	2017-06-22 21:34:39 -04:00
catalog	meson: reindent all files with 8 spaces	2017-04-23 21:47:29 -04:00
coccinelle	tree-wide: drop NULL sentinel from strjoin	2016-10-23 11:43:27 -04:00
docs	meson: use booleans for conf.set and drop unecessary conditionals	2017-05-02 16:29:11 -04:00
factory/etc	factory: remove broken pam_limits	2014-07-30 15:21:54 +02:00
hwdb	hwdb: update hwdb again for v234	2017-07-11 19:26:10 +02:00
m4	build-sys: Perform flag tests in context to existing flags	2016-02-06 14:57:46 +01:00
man	Merge pull request #6300 from keszybz/refuse-to-load-some-units	2017-07-12 09:28:20 +02:00
network	meson: use booleans for conf.set and drop unecessary conditionals	2017-05-02 16:29:11 -04:00
po	Added slovak translation (#6191 )	2017-06-25 13:19:10 -04:00
rules	build-sys: fix installation of new 60-input-id.rules	2017-06-28 11:19:33 -04:00
shell-completion	Add networkctl label to man and shell completion	2017-06-27 10:30:41 -04:00
src	journal: avoid unnecessary mmap_cache_get() calls	2017-07-12 23:59:29 -07:00
sysctl.d	meson: use booleans for conf.set and drop unecessary conditionals	2017-05-02 16:29:11 -04:00
system-preset	units: make enablement of s-n-wait-online.service follow systemd-networkd.service (#5635 )	2017-03-27 12:55:55 +02:00
sysusers.d	meson: do not use path separator for target name (#6177 )	2017-06-22 21:27:07 -04:00
test	tests: adapt test-functions to run tests on SUSE (#6270 )	2017-07-06 14:30:14 -04:00
tmpfiles.d	tmpfiles: create /var/log/lastlog if it does not exist	2017-06-29 08:01:37 +02:00
tools	git-contrib: drop weird non-breaking spaces	2017-07-03 11:22:38 +02:00
units	units: Tell login to preserve environment (#6023 )	2017-07-09 10:53:31 -04:00
xorg	login: support user-bus on dbus1	2015-08-31 18:12:37 +02:00
.dir-locals.el	meson: also indent scripts with 8 spaces	2017-04-25 08:49:16 -04:00
.editorconfig	editors: only extend line width to 119 for C and XML files	2016-02-10 12:29:32 +01:00
.gitattributes	git: indicate that tabs are never OK in the systemd tree	2013-10-30 02:25:38 +01:00
.gitignore	Merge pull request #6194 from keszybz/urandom-magic	2017-06-30 13:05:56 -04:00
.mailmap	NEWS: tweak contributors list a bit	2017-07-03 11:19:20 +02:00
.travis.yml	remove gudev and gtk-doc	2015-06-03 00:22:53 +02:00
.vimrc	vimrc: fix indentation logic for our docbook xml files	2016-04-29 12:23:34 +02:00
.ycm_extra_conf.py	ycm: update flag blacklist	2014-06-04 15:41:10 -04:00
autogen.sh	build-sys/autogen: don't use bashisms (#4489 )	2016-10-25 19:39:48 -04:00
CODING_STYLE	tree-wide: set SA_RESTART for signal handlers we install	2016-12-01 12:41:17 +01:00
configure.ac	NEWS: say that libidn2 is experimental (#6335 )	2017-07-12 09:25:59 +02:00
DISTRO_PORTING	It's now ok to use Google NTP servers (#5311 )	2017-02-12 00:30:40 -05:00
ENVIRONMENT.md	Rename $TEST_DIR to $SYSTEMD_TEST_DATA, document it	2017-02-16 21:36:31 +01:00
HACKING	HACKING: update qemu-kvm instructions (#6138 )	2017-06-20 23:16:16 +02:00
LICENSE.GPL2	relicense to LGPLv2.1 (with exceptions)	2012-04-12 00:24:39 +02:00
LICENSE.LGPL2.1	licence: remove references to old FSF address	2012-12-17 11:41:31 +01:00
Makefile-man.am	make nss-systemd support conditional (#6155 )	2017-06-24 13:30:26 -04:00
Makefile.am	build-sys: fix automake build	2017-07-03 20:14:35 +02:00
meson_options.txt	make nss-systemd support conditional (#6155 )	2017-06-24 13:30:26 -04:00
meson.build	NEWS: say that libidn2 is experimental (#6335 )	2017-07-12 09:25:59 +02:00
mkosi.build	mkosi.build: set encoding	2017-05-05 21:19:04 -04:00
mkosi.default	mkosi: create .mkosi directory	2016-10-06 11:53:58 -04:00
NEWS	NEWS: say that libidn2 is experimental (#6335 )	2017-07-12 09:25:59 +02:00
README	Merge pull request #5928 from keszybz/libidn2	2017-05-12 12:01:40 +02:00
README.md	README: include small graphs of open issues and pull requests (#5576 )	2017-03-13 08:10:04 +01:00
TODO	update TODO	2017-07-10 18:25:58 +02:00

README.md

systemd - System and Service Manager

Details

General information about systemd can be found in the systemd Wiki.

Information about build requirements are provided in the README file.

Consult our NEWS file for information about what's new in the most recent systemd versions.

Please see the HACKING file for information how to hack on systemd and test your modifications.

Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.

When preparing patches for systemd, please follow our Coding Style Guidelines.

If you are looking for support, please contact our mailing list or join our IRC channel.