***/
#include <fcntl.h>
+#include <fnmatch.h>
#include "path-util.h"
#include "special.h"
#include "cgroup-util.h"
#include "cgroup.h"
+#define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
+
void cgroup_context_init(CGroupContext *c) {
assert(c);
/* Initialize everything to the kernel defaults, assuming the
* structure is preinitialized to 0 */
- c->cpu_shares = 1024;
- c->memory_limit = c->memory_soft_limit = (uint64_t) -1;
- c->blockio_weight = 1000;
+ c->cpu_shares = (unsigned long) -1;
+ c->startup_cpu_shares = (unsigned long) -1;
+ c->memory_limit = (uint64_t) -1;
+ c->blockio_weight = (unsigned long) -1;
+ c->startup_blockio_weight = (unsigned long) -1;
+
+ c->cpu_quota_per_sec_usec = USEC_INFINITY;
}
void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
assert(c);
assert(a);
- LIST_REMOVE(CGroupDeviceAllow, device_allow, c->device_allow, a);
+ LIST_REMOVE(device_allow, c->device_allow, a);
free(a->path);
free(a);
}
assert(c);
assert(w);
- LIST_REMOVE(CGroupBlockIODeviceWeight, device_weights, c->blockio_device_weights, w);
+ LIST_REMOVE(device_weights, c->blockio_device_weights, w);
free(w->path);
free(w);
}
assert(c);
assert(b);
- LIST_REMOVE(CGroupBlockIODeviceBandwidth, device_bandwidths, c->blockio_device_bandwidths, b);
+ LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b);
free(b->path);
free(b);
}
CGroupBlockIODeviceBandwidth *b;
CGroupBlockIODeviceWeight *w;
CGroupDeviceAllow *a;
+ char u[FORMAT_TIMESPAN_MAX];
assert(c);
assert(f);
"%sBlockIOAccounting=%s\n"
"%sMemoryAccounting=%s\n"
"%sCPUShares=%lu\n"
+ "%sStartupCPUShares=%lu\n"
+ "%sCPUQuotaPerSecSec=%s\n"
"%sBlockIOWeight=%lu\n"
+ "%sStartupBlockIOWeight=%lu\n"
"%sMemoryLimit=%" PRIu64 "\n"
- "%sMemorySoftLimit=%" PRIu64 "\n"
- "%sDevicePolicy=%s\n",
+ "%sDevicePolicy=%s\n"
+ "%sDelegate=%s\n",
prefix, yes_no(c->cpu_accounting),
prefix, yes_no(c->blockio_accounting),
prefix, yes_no(c->memory_accounting),
prefix, c->cpu_shares,
+ prefix, c->startup_cpu_shares,
+ prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1),
prefix, c->blockio_weight,
+ prefix, c->startup_blockio_weight,
prefix, c->memory_limit,
- prefix, c->memory_soft_limit,
- prefix, cgroup_device_policy_to_string(c->device_policy));
+ prefix, cgroup_device_policy_to_string(c->device_policy),
+ prefix, yes_no(c->delegate));
LIST_FOREACH(device_allow, a, c->device_allow)
fprintf(f,
assert(dev);
r = stat(p, &st);
- if (r < 0) {
- log_warning("Couldn't stat device %s: %m", p);
- return -errno;
- }
+ if (r < 0)
+ return log_warning_errno(errno, "Couldn't stat device %s: %m", p);
if (S_ISBLK(st.st_mode))
*dev = st.st_rdev;
r = cg_set_attribute("devices", path, "devices.allow", buf);
if (r < 0)
- log_warning("Failed to set devices.allow on %s: %s", path, strerror(-r));
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set devices.allow on %s: %s", path, strerror(-r));
return r;
}
-void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path) {
+static int whitelist_major(const char *path, const char *name, char type, const char *acc) {
+ _cleanup_fclose_ FILE *f = NULL;
+ char line[LINE_MAX];
+ bool good = false;
+ int r;
+
+ assert(path);
+ assert(acc);
+ assert(type == 'b' || type == 'c');
+
+ f = fopen("/proc/devices", "re");
+ if (!f)
+ return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type);
+
+ FOREACH_LINE(line, f, goto fail) {
+ char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w;
+ unsigned maj;
+
+ truncate_nl(line);
+
+ if (type == 'c' && streq(line, "Character devices:")) {
+ good = true;
+ continue;
+ }
+
+ if (type == 'b' && streq(line, "Block devices:")) {
+ good = true;
+ continue;
+ }
+
+ if (isempty(line)) {
+ good = false;
+ continue;
+ }
+
+ if (!good)
+ continue;
+
+ p = strstrip(line);
+
+ w = strpbrk(p, WHITESPACE);
+ if (!w)
+ continue;
+ *w = 0;
+
+ r = safe_atou(p, &maj);
+ if (r < 0)
+ continue;
+ if (maj <= 0)
+ continue;
+
+ w++;
+ w += strspn(w, WHITESPACE);
+
+ if (fnmatch(name, w, 0) != 0)
+ continue;
+
+ sprintf(buf,
+ "%c %u:* %s",
+ type,
+ maj,
+ acc);
+
+ r = cg_set_attribute("devices", path, "devices.allow", buf);
+ if (r < 0)
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set devices.allow on %s: %s", path, strerror(-r));
+ }
+
+ return 0;
+
+fail:
+ log_warning_errno(errno, "Failed to read /proc/devices: %m");
+ return -errno;
+}
+
+void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path, ManagerState state) {
+ bool is_root;
int r;
assert(c);
if (mask == 0)
return;
- if (mask & CGROUP_CPU) {
- char buf[DECIMAL_STR_MAX(unsigned long) + 1];
+ /* Some cgroup attributes are not support on the root cgroup,
+ * hence silently ignore */
+ is_root = isempty(path) || path_equal(path, "/");
+
+ if ((mask & CGROUP_CPU) && !is_root) {
+ char buf[MAX(DECIMAL_STR_MAX(unsigned long), DECIMAL_STR_MAX(usec_t)) + 1];
- sprintf(buf, "%lu\n", c->cpu_shares);
+ sprintf(buf, "%lu\n",
+ IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && c->startup_cpu_shares != (unsigned long) -1 ? c->startup_cpu_shares :
+ c->cpu_shares != (unsigned long) -1 ? c->cpu_shares : 1024);
r = cg_set_attribute("cpu", path, "cpu.shares", buf);
if (r < 0)
- log_warning("Failed to set cpu.shares on %s: %s", path, strerror(-r));
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set cpu.shares on %s: %s", path, strerror(-r));
+
+ sprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
+ r = cg_set_attribute("cpu", path, "cpu.cfs_period_us", buf);
+ if (r < 0)
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set cpu.cfs_period_us on %s: %s", path, strerror(-r));
+
+ if (c->cpu_quota_per_sec_usec != USEC_INFINITY) {
+ sprintf(buf, USEC_FMT "\n", c->cpu_quota_per_sec_usec * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC);
+ r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", buf);
+ } else
+ r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", "-1");
+ if (r < 0)
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set cpu.cfs_quota_us on %s: %s", path, strerror(-r));
}
if (mask & CGROUP_BLKIO) {
CGroupBlockIODeviceWeight *w;
CGroupBlockIODeviceBandwidth *b;
- sprintf(buf, "%lu\n", c->blockio_weight);
- r = cg_set_attribute("blkio", path, "blkio.weight", buf);
- if (r < 0)
- log_warning("Failed to set blkio.weight on %s: %s", path, strerror(-r));
+ if (!is_root) {
+ sprintf(buf, "%lu\n", IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && c->startup_blockio_weight != (unsigned long) -1 ? c->startup_blockio_weight :
+ c->blockio_weight != (unsigned long) -1 ? c->blockio_weight : 1000);
+ r = cg_set_attribute("blkio", path, "blkio.weight", buf);
+ if (r < 0)
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set blkio.weight on %s: %s", path, strerror(-r));
- /* FIXME: no way to reset this list */
- LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
- dev_t dev;
+ /* FIXME: no way to reset this list */
+ LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
+ dev_t dev;
- r = lookup_blkio_device(w->path, &dev);
- if (r < 0)
- continue;
+ r = lookup_blkio_device(w->path, &dev);
+ if (r < 0)
+ continue;
- sprintf(buf, "%u:%u %lu", major(dev), minor(dev), w->weight);
- r = cg_set_attribute("blkio", path, "blkio.weight_device", buf);
- if (r < 0)
- log_error("Failed to set blkio.weight_device on %s: %s", path, strerror(-r));
+ sprintf(buf, "%u:%u %lu", major(dev), minor(dev), w->weight);
+ r = cg_set_attribute("blkio", path, "blkio.weight_device", buf);
+ if (r < 0)
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set blkio.weight_device on %s: %s", path, strerror(-r));
+ }
}
/* FIXME: no way to reset this list */
sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), b->bandwidth);
r = cg_set_attribute("blkio", path, a, buf);
if (r < 0)
- log_error("Failed to set %s on %s: %s", a, path, strerror(-r));
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set %s on %s: %s", a, path, strerror(-r));
}
}
if (mask & CGROUP_MEMORY) {
- char buf[DECIMAL_STR_MAX(uint64_t) + 1];
if (c->memory_limit != (uint64_t) -1) {
+ char buf[DECIMAL_STR_MAX(uint64_t) + 1];
+
sprintf(buf, "%" PRIu64 "\n", c->memory_limit);
r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
} else
r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1");
if (r < 0)
- log_error("Failed to set memory.limit_in_bytes on %s: %s", path, strerror(-r));
-
- if (c->memory_soft_limit != (uint64_t) -1) {
- sprintf(buf, "%" PRIu64 "\n", c->memory_soft_limit);
- r = cg_set_attribute("memory", path, "memory.soft_limit_in_bytes", buf);
- } else
- r = cg_set_attribute("memory", path, "memory.soft_limit_in_bytes", "-1");
-
- if (r < 0)
- log_error("Failed to set memory.soft_limit_in_bytes on %s: %s", path, strerror(-r));
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to set memory.limit_in_bytes on %s: %s", path, strerror(-r));
}
- if (mask & CGROUP_DEVICE) {
+ if ((mask & CGROUP_DEVICE) && !is_root) {
CGroupDeviceAllow *a;
if (c->device_allow || c->device_policy != CGROUP_AUTO)
else
r = cg_set_attribute("devices", path, "devices.allow", "a");
if (r < 0)
- log_error("Failed to reset devices.list on %s: %s", path, strerror(-r));
+ log_full(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, "Failed to reset devices.list on %s: %s", path, strerror(-r));
if (c->device_policy == CGROUP_CLOSED ||
(c->device_policy == CGROUP_AUTO && c->device_allow)) {
static const char auto_devices[] =
- "/dev/null\0" "rw\0"
- "/dev/zero\0" "rw\0"
- "/dev/full\0" "rw\0"
- "/dev/random\0" "rw\0"
- "/dev/urandom\0" "rw\0";
+ "/dev/null\0" "rwm\0"
+ "/dev/zero\0" "rwm\0"
+ "/dev/full\0" "rwm\0"
+ "/dev/random\0" "rwm\0"
+ "/dev/urandom\0" "rwm\0"
+ "/dev/tty\0" "rwm\0"
+ "/dev/pts/ptmx\0" "rw\0"; /* /dev/pts/ptmx may not be duplicated, but accessed */
const char *x, *y;
NULSTR_FOREACH_PAIR(x, y, auto_devices)
whitelist_device(path, x, y);
+
+ whitelist_major(path, "pts", 'c', "rw");
+ whitelist_major(path, "kdbus", 'c', "rw");
+ whitelist_major(path, "kdbus/*", 'c', "rw");
}
LIST_FOREACH(device_allow, a, c->device_allow) {
continue;
acc[k++] = 0;
- whitelist_device(path, a->path, acc);
+
+ if (startswith(a->path, "/dev/"))
+ whitelist_device(path, a->path, acc);
+ else if (startswith(a->path, "block-"))
+ whitelist_major(path, a->path + 6, 'b', acc);
+ else if (startswith(a->path, "char-"))
+ whitelist_major(path, a->path + 5, 'c', acc);
+ else
+ log_debug("Ignoring device %s while writing cgroup attribute.", a->path);
}
}
}
/* Figure out which controllers we need */
- if (c->cpu_accounting || c->cpu_shares != 1024)
+ if (c->cpu_accounting ||
+ c->cpu_shares != (unsigned long) -1 ||
+ c->startup_cpu_shares != (unsigned long) -1 ||
+ c->cpu_quota_per_sec_usec != USEC_INFINITY)
mask |= CGROUP_CPUACCT | CGROUP_CPU;
if (c->blockio_accounting ||
- c->blockio_weight != 1000 ||
+ c->blockio_weight != (unsigned long) -1 ||
+ c->startup_blockio_weight != (unsigned long) -1 ||
c->blockio_device_weights ||
c->blockio_device_bandwidths)
mask |= CGROUP_BLKIO;
if (c->memory_accounting ||
- c->memory_limit != (uint64_t) -1 ||
- c->memory_soft_limit != (uint64_t) -1)
+ c->memory_limit != (uint64_t) -1)
mask |= CGROUP_MEMORY;
- if (c->device_allow || c->device_policy != CGROUP_AUTO)
+ if (c->device_allow ||
+ c->device_policy != CGROUP_AUTO)
mask |= CGROUP_DEVICE;
return mask;
}
-static CGroupControllerMask unit_get_cgroup_mask(Unit *u) {
+CGroupControllerMask unit_get_cgroup_mask(Unit *u) {
CGroupContext *c;
c = unit_get_cgroup_context(u);
if (!c)
return 0;
+ /* If delegation is turned on, then turn on all cgroups,
+ * unless the process we fork into it is known to drop
+ * privileges anyway, and shouldn't get access to the
+ * controllers anyway. */
+
+ if (c->delegate) {
+ ExecContext *e;
+
+ e = unit_get_exec_context(u);
+ if (!e || exec_context_maintains_privileges(e))
+ return _CGROUP_CONTROLLER_MASK_ALL;
+ }
+
return cgroup_context_get_mask(c);
}
-static CGroupControllerMask unit_get_members_mask(Unit *u) {
- CGroupControllerMask mask = 0;
- Unit *m;
- Iterator i;
-
+CGroupControllerMask unit_get_members_mask(Unit *u) {
assert(u);
- SET_FOREACH(m, u->dependencies[UNIT_BEFORE], i) {
+ if (u->cgroup_members_mask_valid)
+ return u->cgroup_members_mask;
- if (UNIT_DEREF(m->slice) != u)
- continue;
+ u->cgroup_members_mask = 0;
+
+ if (u->type == UNIT_SLICE) {
+ Unit *member;
+ Iterator i;
+
+ SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) {
+
+ if (member == u)
+ continue;
- mask |= unit_get_cgroup_mask(m) | unit_get_members_mask(m);
+ if (UNIT_DEREF(member->slice) != u)
+ continue;
+
+ u->cgroup_members_mask |=
+ unit_get_cgroup_mask(member) |
+ unit_get_members_mask(member);
+ }
}
+ u->cgroup_members_mask_valid = true;
+ return u->cgroup_members_mask;
+}
+
+CGroupControllerMask unit_get_siblings_mask(Unit *u) {
+ assert(u);
+
+ if (UNIT_ISSET(u->slice))
+ return unit_get_members_mask(UNIT_DEREF(u->slice));
+
+ return unit_get_cgroup_mask(u) | unit_get_members_mask(u);
+}
+
+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;
}
-static CGroupControllerMask unit_get_siblings_mask(Unit *u) {
+/* Recurse from a unit up through its containing slices, propagating
+ * mask bits upward. A unit is also member of itself. */
+void unit_update_cgroup_members_masks(Unit *u) {
+ CGroupControllerMask m;
+ bool more;
+
+ assert(u);
+
+ /* Calculate subtree mask */
+ m = unit_get_cgroup_mask(u) | unit_get_members_mask(u);
+
+ /* See if anything changed from the previous invocation. If
+ * not, we're done. */
+ if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask)
+ return;
+
+ more =
+ u->cgroup_subtree_mask_valid &&
+ ((m & ~u->cgroup_subtree_mask) != 0) &&
+ ((~m & u->cgroup_subtree_mask) == 0);
+
+ u->cgroup_subtree_mask = m;
+ u->cgroup_subtree_mask_valid = true;
+
+ if (UNIT_ISSET(u->slice)) {
+ Unit *s = UNIT_DEREF(u->slice);
+
+ if (more)
+ /* There's more set now than before. We
+ * propagate the new mask to the parent's mask
+ * (not caring if it actually was valid or
+ * not). */
+
+ s->cgroup_members_mask |= m;
+
+ else
+ /* There's less set now than before (or we
+ * don't know), we need to recalculate
+ * everything, so let's invalidate the
+ * parent's members mask */
+
+ s->cgroup_members_mask_valid = false;
+
+ /* And now make sure that this change also hits our
+ * grandparents */
+ unit_update_cgroup_members_masks(s);
+ }
+}
+
+static const char *migrate_callback(CGroupControllerMask mask, void *userdata) {
+ Unit *u = userdata;
+
+ assert(mask != 0);
assert(u);
- if (!UNIT_ISSET(u->slice))
- return 0;
+ while (u) {
+ if (u->cgroup_path &&
+ u->cgroup_realized &&
+ (u->cgroup_realized_mask & mask) == mask)
+ return u->cgroup_path;
- /* Sibling propagation is only relevant for weight-based
- * controllers, so let's mask out everything else */
- return unit_get_members_mask(UNIT_DEREF(u->slice)) &
- (CGROUP_CPU|CGROUP_BLKIO|CGROUP_CPUACCT);
+ u = UNIT_DEREF(u->slice);
+ }
+
+ return NULL;
}
static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) {
- char *path = NULL;
+ _cleanup_free_ char *path = NULL;
int r;
- bool is_in_hash = false;
assert(u);
path = unit_default_cgroup_path(u);
if (!path)
- return -ENOMEM;
+ return log_oom();
r = hashmap_put(u->manager->cgroup_unit, path, u);
- if (r == 0)
- is_in_hash = true;
-
if (r < 0) {
- log_error("cgroup %s exists already: %s", path, strerror(-r));
- free(path);
+ log_error(r == -EEXIST ? "cgroup %s exists already: %s" : "hashmap_put failed for %s: %s", path, strerror(-r));
return r;
}
+ if (r > 0) {
+ u->cgroup_path = path;
+ path = NULL;
+ }
/* First, create our own group */
- r = cg_create_with_mask(mask, path);
+ r = cg_create_everywhere(u->manager->cgroup_supported, mask, u->cgroup_path);
if (r < 0)
- log_error("Failed to create cgroup %s: %s", path, strerror(-r));
+ return log_error_errno(r, "Failed to create cgroup %s: %m", u->cgroup_path);
+
+ /* Keep track that this is now realized */
+ u->cgroup_realized = true;
+ u->cgroup_realized_mask = mask;
/* Then, possibly move things over */
- if (u->cgroup_path && !streq(path, u->cgroup_path)) {
- r = cg_migrate_with_mask(mask, u->cgroup_path, path);
- if (r < 0)
- log_error("Failed to migrate cgroup %s: %s", path, strerror(-r));
- }
+ r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
+ if (r < 0)
+ log_warning_errno(r, "Failed to migrate cgroup from to %s: %m", u->cgroup_path);
- if (!is_in_hash) {
- /* And remember the new data */
- free(u->cgroup_path);
- u->cgroup_path = path;
- }
+ return 0;
+}
- u->cgroup_realized = true;
- u->cgroup_mask = mask;
+static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) {
+ assert(u);
- return 0;
+ return u->cgroup_realized && u->cgroup_realized_mask == mask;
}
-static int unit_realize_cgroup_now(Unit *u) {
+/* 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, ManagerState state) {
CGroupControllerMask mask;
+ int r;
assert(u);
if (u->in_cgroup_queue) {
- LIST_REMOVE(Unit, cgroup_queue, u->manager->cgroup_queue, u);
+ LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, 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)
+ 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), state);
+ 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, state);
+
+ return 0;
}
static void unit_add_to_cgroup_queue(Unit *u) {
if (u->in_cgroup_queue)
return;
- LIST_PREPEND(Unit, cgroup_queue, u->manager->cgroup_queue, u);
+ LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u);
u->in_cgroup_queue = true;
}
unsigned manager_dispatch_cgroup_queue(Manager *m) {
- Unit *i;
+ ManagerState state;
unsigned n = 0;
+ Unit *i;
+ int r;
+
+ state = manager_state(m);
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, state);
+ if (r < 0)
+ log_warning_errno(r, "Failed to realize cgroups for queued unit %s: %m", i->id);
n++;
}
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);
}
int unit_realize_cgroup(Unit *u) {
CGroupContext *c;
- int r;
assert(u);
* unit, we need to first create all parents, but there's more
* actually: for the weight-based controllers we also need to
* make sure that all our siblings (i.e. units that are in the
- * same slice as we are) have cgroup too. Otherwise things
+ * same slice as we are) have cgroups, too. Otherwise, things
* would become very uneven as each of their processes would
* get as much resources as all our group together. This call
* will synchronously create the parent cgroups, but will
/* Add all sibling slices to the cgroup queue. */
unit_queue_siblings(u);
- /* And realize this one now */
- 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;
+ /* And realize this one now (and apply the values) */
+ return unit_realize_cgroup_now(u, manager_state(u->manager));
}
-void unit_destroy_cgroup(Unit *u) {
+void unit_destroy_cgroup_if_empty(Unit *u) {
int r;
assert(u);
if (!u->cgroup_path)
return;
- r = cg_trim_with_mask(u->cgroup_mask, u->cgroup_path, !unit_has_name(u, SPECIAL_ROOT_SLICE));
- if (r < 0)
- log_debug("Failed to destroy cgroup %s: %s", u->cgroup_path, strerror(-r));
+ r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !unit_has_name(u, SPECIAL_ROOT_SLICE));
+ if (r < 0) {
+ log_debug_errno(r, "Failed to destroy cgroup %s: %m", u->cgroup_path);
+ return;
+ }
hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
free(u->cgroup_path);
u->cgroup_path = NULL;
u->cgroup_realized = false;
- u->cgroup_mask = 0;
-
+ u->cgroup_realized_mask = 0;
}
pid_t unit_search_main_pid(Unit *u) {
int manager_setup_cgroup(Manager *m) {
_cleanup_free_ char *path = NULL;
int r;
- char *e, *a;
assert(m);
- /* 0. Be nice to Ingo Molnar #628004 */
- if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) {
- log_warning("No control group support available, not creating root group.");
- return 0;
- }
-
/* 1. Determine hierarchy */
free(m->cgroup_root);
m->cgroup_root = NULL;
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
- if (r < 0) {
- log_error("Cannot determine cgroup we are running in: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
- /* Already in /system.slice? If so, let's cut this off again */
+ /* LEGACY: Already in /system.slice? If so, let's cut this
+ * off. This is to support live upgrades from older systemd
+ * versions where PID 1 was moved there. */
if (m->running_as == SYSTEMD_SYSTEM) {
+ char *e;
+
e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
+ if (!e)
+ e = endswith(m->cgroup_root, "/system");
if (e)
*e = 0;
}
/* 2. Show data */
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
- if (r < 0) {
- log_error("Cannot find cgroup mount point: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Cannot find cgroup mount point: %m");
log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
+ if (!m->test_run) {
- /* 3. Install agent */
- if (m->running_as == SYSTEMD_SYSTEM) {
- r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
- if (r < 0)
- log_warning("Failed to install release agent, ignoring: %s", strerror(-r));
- else if (r > 0)
- log_debug("Installed release agent.");
- else
- log_debug("Release agent already installed.");
- }
+ /* 3. Install agent */
+ if (m->running_as == SYSTEMD_SYSTEM) {
+ r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
+ if (r < 0)
+ log_warning_errno(r, "Failed to install release agent, ignoring: %m");
+ else if (r > 0)
+ log_debug("Installed release agent.");
+ else
+ log_debug("Release agent already installed.");
+ }
- /* 4. Realize the system slice and put us in there */
- if (m->running_as == SYSTEMD_SYSTEM) {
- a = strappenda(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
- r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, a, 0);
- } else
+ /* 4. Make sure we are in the root cgroup */
r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0);
- if (r < 0) {
- log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to create root cgroup hierarchy: %m");
- /* 5. And pin it, so that it cannot be unmounted */
- if (m->pin_cgroupfs_fd >= 0)
- close_nointr_nofail(m->pin_cgroupfs_fd);
+ /* 5. And pin it, so that it cannot be unmounted */
+ safe_close(m->pin_cgroupfs_fd);
- m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
- if (r < 0) {
- log_error("Failed to open pin file: %m");
- return -errno;
+ m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
+ if (m->pin_cgroupfs_fd < 0)
+ return log_error_errno(errno, "Failed to open pin file: %m");
+
+ /* 6. Always enable hierarchial support if it exists... */
+ cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
}
- /* 6. Figure out which controllers are supported */
+ /* 7. Figure out which controllers are supported */
m->cgroup_supported = cg_mask_supported();
return 0;
if (delete && m->cgroup_root)
cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
- if (m->pin_cgroupfs_fd >= 0) {
- close_nointr_nofail(m->pin_cgroupfs_fd);
- m->pin_cgroupfs_fd = -1;
- }
+ m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
free(m->cgroup_root);
m->cgroup_root = NULL;
~ianmdlvl / elogind.git / blobdiff