From 5fe8876b320e9f6355425df9991ac38363684117 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Tue, 1 Sep 2015 18:47:46 +0200 Subject: core: when looking for the unit for a process, look at the PID hashmaps first It's cheaper that going to cgroupfs, and also usually the better choice since it's not racy and can map PIDs even if they were moved to a different unit. --- src/core/cgroup.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'src/core') diff --git a/src/core/cgroup.c b/src/core/cgroup.c index aafd75f424..e92d2cc850 100644 --- a/src/core/cgroup.c +++ b/src/core/cgroup.c @@ -1005,6 +1005,7 @@ Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { _cleanup_free_ char *cgroup = NULL; + Unit *u; int r; assert(m); @@ -1012,6 +1013,14 @@ Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { if (pid <= 1) return NULL; + u = hashmap_get(m->watch_pids1, LONG_TO_PTR(pid)); + if (u) + return u; + + u = hashmap_get(m->watch_pids2, LONG_TO_PTR(pid)); + if (u) + return u; + r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup); if (r < 0) return NULL; -- cgit v1.2.3-54-g00ecf