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Now that objects of all unit types are allocated the exact amount of
memory they need, the Unit union has lost its purpose. Remove it.
"Unit" is a more natural name for the base unit class than "Meta", so
rename Meta to Unit.
Access to members of the base class gets simplified.
The storage of the unit objects on the heap is currently not very
efficient. For every unit object we allocate a chunk of memory as large
as the biggest unit type, although there are significant differences in
the units' real requirements.
pahole shows the following sizes of structs:
488 Target
496 Snapshot
512 Device
528 Path
560 Timer
576 Automount
1080 Socket
1160 Swap
1168 Service
1280 Mount
Usually there aren't many targets or snapshots in the system, but Device
is one of the most common unit types and for every one we waste
1280 - 512 = 768 bytes.
Fix it by allocating only the right amount for the given unit type.
On my machine (x86_64, with 39 LVM volumes) this decreases systemd's
USS (unique set size) by more than 300 KB.
When we merge units that some kind of object points to, those pointers
might become invalidated, and needs to be updated. Introduce a UnitRef
struct which links up all the unit references, to ensure corrected
references.
At the same time, drop configured_sockets in the Service object, and
replace it by proper UNIT_TRIGGERS resp. UNIT_TRIGGERED_BY dependencies,
which allow us to simplify a lot of code.
A freshly started unit A was immediately considered unneeded just because
unit B, which Requires A, was starting later in the transaction.
Fix it by looking not only at the state of B, but also at its pending job.
Also fix a copied&pasted comment.
Units that failed to load were never cleaned up. It was possible to
reach the 128K limit of units by attempting to load a bunch of nonsense.
Bug observed by Reartes Guillermo in
https://bugzilla.redhat.com/show_bug.cgi?id=680122
The code should probably look like the statements above it.
Please verify, I just detected it using cppcheck.
Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
'man systemd.target' says:
Unless DefaultDependencies= is set to false, target units will
implicitly complement all configured dependencies of type
Wants=, Requires=, RequiresOverridable= with dependencies of type
After= if the units in question also have DefaultDependencies=true.
It did not work because of a forgotten negation.
Instead of having individual counters n_serializing and n_deserializing
have a single one n_reloading, which should be sufficient.
Set n_reloading when we are about to go down for reexecution to avoid
cgroup trimming when we free the units for reexecution.
