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hierarchy
Currently the hybrid mode mounts cgroup v2 on /sys/fs/cgroup instead of the v1
name=elogind hierarchy. While this works fine for elogind itself, it breaks
tools which expect cgroup v1 hierarchy on /sys/fs/cgroup/elogind.
This patch updates the hybrid mode so that it mounts v2 hierarchy on
/sys/fs/cgroup/unified and keeps v1 "name=elogind" hierarchy on
/sys/fs/cgroup/elogind for compatibility. elogind itself doesn't depend on the
"name=elogind" hierarchy at all. All operations take place on the v2 hierarchy
as before but the v1 hierarchy is kept in sync so that any tools which expect
it to be there can keep doing so. This allows elogind to take advantage of
cgroup v2 process management without requiring other tools to be aware of the
hybrid mode.
The hybrid mode is implemented by mapping the special elogind controller to
/sys/fs/cgroup/unified and making the basic cgroup utility operations -
cg_attach(), cg_create(), cg_rmdir() and cg_trim() - also operate on the
/sys/fs/cgroup/elogind hierarchy whenever the cgroup2 hierarchy is updated.
While a bit messy, this will allow dropping complications from using cgroup v1
for process management a lot sooner than otherwise possible which should make
it a net gain in terms of maintainability.
v2: Fixed !cgns breakage reported by @evverx and renamed the unified mount
point to /sys/fs/cgroup/unified as suggested by @brauner.
v3: chown the compat hierarchy too on delegation. Suggested by @evverx.
v4: [zj]
- drop the change to default, full "legacy" is still the default.
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In preparation for adding a version which takes a strv.
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This should be handled fine now by .dir-locals.el, so need to carry that
stuff in every file.
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Apply remaining fixes and the performed move of utility functions
into their own foo-util.[hc] files on libbasic.
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Although it is nice to have it read ELOGIND instead of SYSTEMD, all
diffs just show too many irrelevant (false) positives.
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elogind has to run on any system, no matter which init system is in
control of the cgroups. So instead of hardcoding "name=foo",
configure now greps 1: in /proc/self/cgroup - which is hopefully
the right choice. (Well, to be honest, if it isn't, something is
really wrong with the running system...)
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Let elogind setup cgroups support on its manager initialization and
free the cgroups subsystem when the manager is destroyed.
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The files
- src/core/org.freedesktop.systemd.policy.in.in and
- src/core/systemd.pc.in
have been deleted as they are not needed.
The other changes are some minor fixes.
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This commit replays the moving around of source files that have been
done between systemd-219 and systemd-221.
Further the Makefile.am is synchronized with the upstream version and
then "re-cleaned".
A lot of functions, that are not used anywhere in elogind have been
coated into #if 0/#endif directives to further shorten the list of
dependencies.
All unneeded files have been removed.
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