While this offers quite a few benefits for normally scheduled processes
this breaks RT scheduling for all user processes, since we do not assign
an RT share to the cgroups created via this mechanism. If the user
cgroups have no RT share assigned no member process can make use of RT
functionality. However, software like JACK and PA/rtkit assume that RT
is available in some way or another, either via RLIMIT_RTPRIO or via
some privileged service. Creating implicit cpu cgroups but not adding
RT shares to them hence breaks these applications.
There is no sane way to implicitly add RT shares to these groups, since
they are pulled from a global, limited pool and it would hence be very
hard to make this work without limiting the number of concurrent
sessions, or constantly rewriting the cpu share settings of already
logged in session cgroups.
Most likely this issue needs to be fixed in-kernel because we can enable
this feature by default again.
If you have a path unit with:
DirectoryNotEmpty=/foo
and "/foo" does not exist, creating it later escapes the attention of systemd.
When adding watches for parent directories, systemd never adds one for the root
directory. It attempts to add a watch for an empty string instead, which fails.
If the path is "/", we must not trim the slash.
That unity pulls in OpenRC which in turn pulls in most of legacy
system that causes lots of troubles as it is too smart, thus not
recommended.
Moreover, SystemD developers seems to agree that a service file per DM
is the best approach, so having gdm.service, kdm.service, slim.service
is better than a single wrapper for them.
When cross-compiling systemd, the introspection XML files fail to be
generated because the systemd host binary is not executable. This patch
works around this by putting the introspection XML data into separate
ELF sections and extracting them from the binary when generating the XML
files.
The extracted XML data is passed through the strings utility in order to
strip the trailing NUL character. A small AWK script is used to prepend
the doctype and add the opening and closing node tags respectively.
Finally, the C preprocessor is used to substitute the correct doctype
information from the D-Bus header files.
Tom Gundersen