summaryrefslogtreecommitdiff
path: root/src/core
diff options
context:
space:
mode:
Diffstat (limited to 'src/core')
-rw-r--r--src/core/cgroup.c94
-rw-r--r--src/core/cgroup.h2
-rw-r--r--src/core/unit.c8
-rw-r--r--src/core/unit.h1
4 files changed, 75 insertions, 30 deletions
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 1a8fd3728f..c2b1b7d38d 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -346,21 +346,8 @@ static CGroupControllerMask unit_get_cgroup_mask(Unit *u) {
}
static CGroupControllerMask unit_get_members_mask(Unit *u) {
- CGroupControllerMask mask = 0;
- Unit *m;
- Iterator i;
-
assert(u);
-
- SET_FOREACH(m, u->dependencies[UNIT_BEFORE], i) {
-
- if (UNIT_DEREF(m->slice) != u)
- continue;
-
- mask |= unit_get_cgroup_mask(m) | unit_get_members_mask(m);
- }
-
- return mask;
+ return u->cgroup_members_mask;
}
static CGroupControllerMask unit_get_siblings_mask(Unit *u) {
@@ -375,6 +362,26 @@ static CGroupControllerMask unit_get_siblings_mask(Unit *u) {
(CGROUP_CPU|CGROUP_BLKIO|CGROUP_CPUACCT);
}
+static CGroupControllerMask unit_get_target_mask(Unit *u) {
+ CGroupControllerMask mask;
+
+ mask = unit_get_cgroup_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
+ mask &= u->manager->cgroup_supported;
+
+ return mask;
+}
+
+/* Recurse from a unit up through its containing slices, propagating
+ * mask bits upward. A unit is also member of itself. */
+void unit_update_member_masks(Unit *u) {
+ u->cgroup_members_mask |= unit_get_cgroup_mask(u);
+ if (UNIT_ISSET(u->slice)) {
+ Unit *s = UNIT_DEREF(u->slice);
+ s->cgroup_members_mask |= u->cgroup_members_mask;
+ unit_update_member_masks(s);
+ }
+}
+
static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
_cleanup_free_ char *path;
int r;
@@ -422,8 +429,19 @@ static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
return 0;
}
+static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) {
+ return u->cgroup_realized && u->cgroup_mask == mask;
+}
+
+/* Check if necessary controllers and attributes for a unit are in place.
+ *
+ * If so, do nothing.
+ * If not, create paths, move processes over, and set attributes.
+ *
+ * Returns 0 on success and < 0 on failure. */
static int unit_realize_cgroup_now(Unit *u) {
CGroupControllerMask mask;
+ int r;
assert(u);
@@ -432,19 +450,28 @@ static int unit_realize_cgroup_now(Unit *u) {
u->in_cgroup_queue = false;
}
- mask = unit_get_cgroup_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
- mask &= u->manager->cgroup_supported;
+ mask = unit_get_target_mask(u);
- if (u->cgroup_realized &&
- u->cgroup_mask == mask)
+ /* TODO: Consider skipping this check. It may be redundant. */
+ if (unit_has_mask_realized(u, mask))
return 0;
/* First, realize parents */
- if (UNIT_ISSET(u->slice))
- unit_realize_cgroup_now(UNIT_DEREF(u->slice));
+ if (UNIT_ISSET(u->slice)) {
+ r = unit_realize_cgroup_now(UNIT_DEREF(u->slice));
+ if (r < 0)
+ return r;
+ }
/* And then do the real work */
- return unit_create_cgroups(u, mask);
+ r = unit_create_cgroups(u, mask);
+ if (r < 0)
+ return r;
+
+ /* Finally, apply the necessary attributes. */
+ cgroup_context_apply(unit_get_cgroup_context(u), mask, u->cgroup_path);
+
+ return 0;
}
static void unit_add_to_cgroup_queue(Unit *u) {
@@ -459,12 +486,14 @@ static void unit_add_to_cgroup_queue(Unit *u) {
unsigned manager_dispatch_cgroup_queue(Manager *m) {
Unit *i;
unsigned n = 0;
+ int r;
while ((i = m->cgroup_queue)) {
assert(i->in_cgroup_queue);
- if (unit_realize_cgroup_now(i) >= 0)
- cgroup_context_apply(unit_get_cgroup_context(i), i->cgroup_mask, i->cgroup_path);
+ r = unit_realize_cgroup_now(i);
+ if (r < 0)
+ log_warning("Failed to realize cgroups for queued unit %s: %s", i->id, strerror(-r));
n++;
}
@@ -487,9 +516,22 @@ static void unit_queue_siblings(Unit *u) {
if (m == u)
continue;
+ /* Skip units that have a dependency on the slice
+ * but aren't actually in it. */
if (UNIT_DEREF(m->slice) != slice)
continue;
+ /* No point in doing cgroup application for units
+ * without active processes. */
+ if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
+ continue;
+
+ /* If the unit doesn't need any new controllers
+ * and has current ones realized, it doesn't need
+ * any changes. */
+ if (unit_has_mask_realized(m, unit_get_target_mask(m)))
+ continue;
+
unit_add_to_cgroup_queue(m);
}
@@ -521,13 +563,9 @@ int unit_realize_cgroup(Unit *u) {
/* Add all sibling slices to the cgroup queue. */
unit_queue_siblings(u);
- /* And realize this one now */
+ /* And realize this one now (and apply the values) */
r = unit_realize_cgroup_now(u);
- /* And apply the values */
- if (r >= 0)
- cgroup_context_apply(c, u->cgroup_mask, u->cgroup_path);
-
return r;
}
diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index 0a079e909d..25f40f7b62 100644
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -113,3 +113,5 @@ int manager_notify_cgroup_empty(Manager *m, const char *group);
const char* cgroup_device_policy_to_string(CGroupDevicePolicy i) _const_;
CGroupDevicePolicy cgroup_device_policy_from_string(const char *s) _pure_;
+
+void unit_update_member_masks(Unit *u);
diff --git a/src/core/unit.c b/src/core/unit.c
index 1173f0b160..894485f6d7 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -741,7 +741,8 @@ void unit_dump(Unit *u, FILE *f, const char *prefix) {
"%s\tSlice: %s\n"
"%s\tCGroup: %s\n"
"%s\tCGroup realized: %s\n"
- "%s\tCGroup mask: 0x%x\n",
+ "%s\tCGroup mask: 0x%x\n"
+ "%s\tCGroup members mask: 0x%x\n",
prefix, u->id,
prefix, unit_description(u),
prefix, strna(u->instance),
@@ -757,7 +758,8 @@ void unit_dump(Unit *u, FILE *f, const char *prefix) {
prefix, strna(unit_slice_name(u)),
prefix, strna(u->cgroup_path),
prefix, yes_no(u->cgroup_realized),
- prefix, u->cgroup_mask);
+ prefix, u->cgroup_mask,
+ prefix, u->cgroup_members_mask);
SET_FOREACH(t, u->names, i)
fprintf(f, "%s\tName: %s\n", prefix, t);
@@ -1025,6 +1027,8 @@ int unit_load(Unit *u) {
goto fail;
}
+ unit_update_member_masks(u);
+
r = unit_add_mount_links(u);
if (r < 0)
goto fail;
diff --git a/src/core/unit.h b/src/core/unit.h
index c58202bf0f..5b4f86c584 100644
--- a/src/core/unit.h
+++ b/src/core/unit.h
@@ -175,6 +175,7 @@ struct Unit {
/* Counterparts in the cgroup filesystem */
char *cgroup_path;
CGroupControllerMask cgroup_mask;
+ CGroupControllerMask cgroup_members_mask;
UnitRef slice;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-04 16:19:00 +0000