d8fdc62037
dbus-daemon currently uses a backlog of 30 on its D-bus system bus socket. On overloaded systems this means that only 30 connections may be queued without dbus-daemon processing them before further connection attempts fail. Our cgroups-agent binary so far used D-Bus for its messaging, and hitting this limit hence may result in us losing cgroup empty messages. This patch adds a seperate cgroup agent socket of type AF_UNIX/SOCK_DGRAM. Since sockets of these types need no connection set up, no listen() backlog applies. Our cgroup-agent binary will hence simply block as long as it can't enqueue its datagram message, so that we won't lose cgroup empty messages as likely anymore. This also rearranges the ordering of the processing of SIGCHLD signals, service notification messages (sd_notify()...) and the two types of cgroup notifications (inotify for the unified hierarchy support, and agent for the classic hierarchy support). We now always process events for these in the following order: 1. service notification messages (SD_EVENT_PRIORITY_NORMAL-7) 2. SIGCHLD signals (SD_EVENT_PRIORITY_NORMAL-6) 3. cgroup inotify and cgroup agent (SD_EVENT_PRIORITY_NORMAL-5) This is because when receiving SIGCHLD we invalidate PID information, which we need to process the service notification messages which are bound to PIDs. Hence the order between the first two items. And we want to process SIGCHLD metadata to detect whether a service is gone, before using cgroup notifications, to decide when a service is gone, since the former carries more useful metadata. Related to this: https://bugs.freedesktop.org/show_bug.cgi?id=95264 https://github.com/systemd/systemd/issues/1961 |
||
---|---|---|
.github | ||
catalog | ||
coccinelle | ||
docs | ||
factory/etc | ||
hwdb | ||
m4 | ||
man | ||
network | ||
po | ||
rules | ||
shell-completion | ||
src | ||
sysctl.d | ||
system-preset | ||
sysusers.d | ||
test | ||
tmpfiles.d | ||
tools | ||
units | ||
xorg | ||
.dir-locals.el | ||
.editorconfig | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
.travis.yml | ||
.vimrc | ||
.ycm_extra_conf.py | ||
autogen.sh | ||
CODING_STYLE | ||
configure.ac | ||
DISTRO_PORTING | ||
LICENSE.GPL2 | ||
LICENSE.LGPL2.1 | ||
Makefile-man.am | ||
Makefile.am | ||
NEWS | ||
README | ||
README.md | ||
TODO |
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 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.