core: expose consumed CPU time per unit

This adds support for showing the accumulated consumed CPU time per-unit
in the "systemctl status" output. The property is also readable via the
bus.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/core/swap.c b/src/core/swap.c
index de3a5d8b10..4dd6be8c9a 100644
--- a/src/core/swap.c
+++ b/src/core/swap.c
@@ -604,7 +604,11 @@ static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
         assert(c);
         assert(_pid);
 
-        unit_realize_cgroup(UNIT(s));
+        (void) unit_realize_cgroup(UNIT(s));
+        if (s->reset_cpu_usage) {
+                (void) unit_reset_cpu_usage(UNIT(s));
+                s->reset_cpu_usage = false;
+        }
 
         r = unit_setup_exec_runtime(UNIT(s));
         if (r < 0)
@@ -830,6 +834,8 @@ static int swap_start(Unit *u) {
                         return -EAGAIN;
 
         s->result = SWAP_SUCCESS;
+        s->reset_cpu_usage = true;
+
         swap_enter_activating(s);
         return 1;
 }