oom: shorten xattr name

src/core/cgroup.c

@@ -2746,7 +2746,7 @@ int unit_check_oomd_kill(Unit *u) {
         else if (r == 0)
                 return 0;
 
-        r = cg_get_xattr_malloc(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "user.systemd_oomd_kill", &value);
+        r = cg_get_xattr_malloc(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "user.oomd_kill", &value);
         if (r < 0 && r != -ENODATA)
                 return r;
 

src/oom/oomd-util.c

@@ -201,9 +201,9 @@ int oomd_cgroup_kill(const char *path, bool recurse, bool dry_run) {
         if (r < 0)
                 return r;
 
-        r = increment_oomd_xattr(path, "user.systemd_oomd_kill", set_size(pids_killed));
+        r = increment_oomd_xattr(path, "user.oomd_kill", set_size(pids_killed));
         if (r < 0)
-                log_debug_errno(r, "Failed to set user.systemd_oomd_kill on kill: %m");
+                log_debug_errno(r, "Failed to set user.oomd_kill on kill: %m");
 
         return set_size(pids_killed) != 0;
 }

src/oom/test-oomd-util.c

@@ -79,7 +79,7 @@ static void test_oomd_cgroup_kill(void) {
                 sleep(2);
                 assert_se(cg_is_empty(SYSTEMD_CGROUP_CONTROLLER, cgroup) == true);
 
-                assert_se(cg_get_xattr_malloc(SYSTEMD_CGROUP_CONTROLLER, cgroup, "user.systemd_oomd_kill", &v) >= 0);
+                assert_se(cg_get_xattr_malloc(SYSTEMD_CGROUP_CONTROLLER, cgroup, "user.oomd_kill", &v) >= 0);
                 assert_se(memcmp(v, i == 0 ? "2" : "4", 2) == 0);
         }
 }