Features:
+* tweak journald context caching. In addition to caching per-process attributes
+ keyed by PID, cache per-cgroup attributes (i.e. the various xattrs we read)
+ keyed by cgroup path, and guarded by ctime changes. This should provide us
+ with a nice speed-up on services that have many processes running in the same
+ cgroup.
+
* clean up sleep.c:
- Use CLOCK_BOOTTIME_ALARM for waking up s2h instead of RTC ioctls
- Parse sleep.conf only once, and parse its whole contents so that we don't