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, 28 insertions, 14 deletions

diff --git a/src/core/dbus-unit.c b/src/core/dbus-unit.c
index 0ff9a01e11..af7dc26241 100644
--- a/src/core/dbus-unit.c
+++ b/src/core/dbus-unit.c
@@ -661,30 +661,43 @@ static int property_get_current_memory(
                 void *userdata,
                 sd_bus_error *error) {
 
-        Unit *u = userdata;
         uint64_t sz = (uint64_t) -1;
+        Unit *u = userdata;
         int r;
 
         assert(bus);
         assert(reply);
         assert(u);
 
-        if (u->cgroup_path &&
-            (u->cgroup_realized_mask & CGROUP_MEMORY)) {
-                _cleanup_free_ char *v = NULL;
+        r = unit_get_memory_current(u, &sz);
+        if (r < 0 && r != -ENODATA)
+                log_unit_warning_errno(u->id, r, "Failed to get memory.usage_in_bytes attribute: %m");
 
-                r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
-                if (r < 0 && r != -ENOENT)
-                        log_unit_warning_errno(u->id, r, "Couldn't read memory.usage_in_bytes attribute: %m");
+        return sd_bus_message_append(reply, "t", sz);
+}
 
-                if (v) {
-                        r = safe_atou64(v, &sz);
-                        if (r < 0)
-                                log_unit_warning_errno(u->id, r, "Failed to parse memory.usage_in_bytes attribute: %m");
-                }
-        }
+static int property_get_cpu_usage(
+                sd_bus *bus,
+                const char *path,
+                const char *interface,
+                const char *property,
+                sd_bus_message *reply,
+                void *userdata,
+                sd_bus_error *error) {
 
-        return sd_bus_message_append(reply, "t", sz);
+        nsec_t ns = (nsec_t) -1;
+        Unit *u = userdata;
+        int r;
+
+        assert(bus);
+        assert(reply);
+        assert(u);
+
+        r = unit_get_cpu_usage(u, &ns);
+        if (r < 0 && r != -ENODATA)
+                log_unit_warning_errno(u->id, r, "Failed to get cpuacct.usage attribute: %m");
+
+        return sd_bus_message_append(reply, "t", ns);
 }
 
 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
@@ -692,6 +705,7 @@ const sd_bus_vtable bus_unit_cgroup_vtable[] = {
         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
         SD_BUS_PROPERTY("ControlGroup", "s", NULL, offsetof(Unit, cgroup_path), 0),
         SD_BUS_PROPERTY("MemoryCurrent", "t", property_get_current_memory, 0, 0),
+        SD_BUS_PROPERTY("CPUUsageNSec", "t", property_get_cpu_usage, 0, 0),
         SD_BUS_VTABLE_END
 };