diff options
Diffstat (limited to 'src/core/cgroup.c')
| -rw-r--r-- | src/core/cgroup.c | 586 |
1 files changed, 479 insertions, 107 deletions
diff --git a/src/core/cgroup.c b/src/core/cgroup.c index e92d2cc850..a70b4d33ae 100644 --- a/src/core/cgroup.c +++ b/src/core/cgroup.c @@ -283,7 +283,7 @@ fail: return -errno; } -void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path, ManagerState state) { +void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, ManagerState state) { bool is_root; int r; @@ -304,7 +304,7 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha * cgroup trees (assuming we are running in a container then), * and missing cgroups, i.e. EROFS and ENOENT. */ - if ((mask & CGROUP_CPU) && !is_root) { + if ((mask & CGROUP_MASK_CPU) && !is_root) { char buf[MAX(DECIMAL_STR_MAX(unsigned long), DECIMAL_STR_MAX(usec_t)) + 1]; sprintf(buf, "%lu\n", @@ -331,7 +331,7 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha "Failed to set cpu.cfs_quota_us on %s: %m", path); } - if (mask & CGROUP_BLKIO) { + if (mask & CGROUP_MASK_BLKIO) { char buf[MAX3(DECIMAL_STR_MAX(unsigned long)+1, DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(unsigned long)*1, DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1)]; @@ -381,21 +381,30 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha } } - if ((mask & CGROUP_MEMORY) && !is_root) { + if ((mask & CGROUP_MASK_MEMORY) && !is_root) { 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 (cg_unified() <= 0) + r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf); + else + r = cg_set_attribute("memory", path, "memory.max", buf); + + } else { + if (cg_unified() <= 0) + r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1"); + else + r = cg_set_attribute("memory", path, "memory.max", "max"); + } if (r < 0) log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set memory.limit_in_bytes on %s: %m", path); + "Failed to set memory.limit_in_bytes/memory.max on %s: %m", path); } - if ((mask & CGROUP_DEVICE) && !is_root) { + if ((mask & CGROUP_MASK_DEVICE) && !is_root) { CGroupDeviceAllow *a; /* Changing the devices list of a populated cgroup @@ -459,8 +468,8 @@ void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const cha } } -CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) { - CGroupControllerMask mask = 0; +CGroupMask cgroup_context_get_mask(CGroupContext *c) { + CGroupMask mask = 0; /* Figure out which controllers we need */ @@ -468,29 +477,31 @@ CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) { 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; + mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU; if (c->blockio_accounting || c->blockio_weight != (unsigned long) -1 || c->startup_blockio_weight != (unsigned long) -1 || c->blockio_device_weights || c->blockio_device_bandwidths) - mask |= CGROUP_BLKIO; + mask |= CGROUP_MASK_BLKIO; if (c->memory_accounting || c->memory_limit != (uint64_t) -1) - mask |= CGROUP_MEMORY; + mask |= CGROUP_MASK_MEMORY; if (c->device_allow || c->device_policy != CGROUP_AUTO) - mask |= CGROUP_DEVICE; + mask |= CGROUP_MASK_DEVICE; return mask; } -CGroupControllerMask unit_get_cgroup_mask(Unit *u) { +CGroupMask unit_get_own_mask(Unit *u) { CGroupContext *c; + /* Returns the mask of controllers the unit needs for itself */ + c = unit_get_cgroup_context(u); if (!c) return 0; @@ -505,15 +516,18 @@ CGroupControllerMask unit_get_cgroup_mask(Unit *u) { e = unit_get_exec_context(u); if (!e || exec_context_maintains_privileges(e)) - return _CGROUP_CONTROLLER_MASK_ALL; + return _CGROUP_MASK_ALL; } return cgroup_context_get_mask(c); } -CGroupControllerMask unit_get_members_mask(Unit *u) { +CGroupMask unit_get_members_mask(Unit *u) { assert(u); + /* Returns the mask of controllers all of the unit's children + * require, merged */ + if (u->cgroup_members_mask_valid) return u->cgroup_members_mask; @@ -532,7 +546,7 @@ CGroupControllerMask unit_get_members_mask(Unit *u) { continue; u->cgroup_members_mask |= - unit_get_cgroup_mask(member) | + unit_get_own_mask(member) | unit_get_members_mask(member); } } @@ -541,19 +555,52 @@ CGroupControllerMask unit_get_members_mask(Unit *u) { return u->cgroup_members_mask; } -CGroupControllerMask unit_get_siblings_mask(Unit *u) { +CGroupMask unit_get_siblings_mask(Unit *u) { assert(u); + /* Returns the mask of controllers all of the unit's siblings + * require, i.e. the members mask of the unit's parent slice + * if there is one. */ + 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); + return unit_get_own_mask(u) | unit_get_members_mask(u); } -CGroupControllerMask unit_get_target_mask(Unit *u) { - CGroupControllerMask mask; +CGroupMask unit_get_subtree_mask(Unit *u) { + + /* Returns the mask of this subtree, meaning of the group + * itself and its children. */ + + return unit_get_own_mask(u) | unit_get_members_mask(u); +} + +CGroupMask unit_get_target_mask(Unit *u) { + CGroupMask mask; + + /* This returns the cgroup mask of all controllers to enable + * for a specific cgroup, i.e. everything it needs itself, + * plus all that its children need, plus all that its siblings + * need. This is primarily useful on the legacy cgroup + * hierarchy, where we need to duplicate each cgroup in each + * hierarchy that shall be enabled for it. */ - mask = unit_get_cgroup_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u); + mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u); + mask &= u->manager->cgroup_supported; + + return mask; +} + +CGroupMask unit_get_enable_mask(Unit *u) { + CGroupMask mask; + + /* This returns the cgroup mask of all controllers to enable + * for the children of a specific cgroup. This is primarily + * useful for the unified cgroup hierarchy, where each cgroup + * controls which controllers are enabled for its children. */ + + mask = unit_get_members_mask(u); mask &= u->manager->cgroup_supported; return mask; @@ -562,13 +609,13 @@ CGroupControllerMask unit_get_target_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; + CGroupMask m; bool more; assert(u); /* Calculate subtree mask */ - m = unit_get_cgroup_mask(u) | unit_get_members_mask(u); + m = unit_get_subtree_mask(u); /* See if anything changed from the previous invocation. If * not, we're done. */ @@ -608,7 +655,7 @@ void unit_update_cgroup_members_masks(Unit *u) { } } -static const char *migrate_callback(CGroupControllerMask mask, void *userdata) { +static const char *migrate_callback(CGroupMask mask, void *userdata) { Unit *u = userdata; assert(mask != 0); @@ -626,7 +673,115 @@ static const char *migrate_callback(CGroupControllerMask mask, void *userdata) { return NULL; } -static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) { +char *unit_default_cgroup_path(Unit *u) { + _cleanup_free_ char *escaped = NULL, *slice = NULL; + int r; + + assert(u); + + if (unit_has_name(u, SPECIAL_ROOT_SLICE)) + return strdup(u->manager->cgroup_root); + + if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) { + r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice); + if (r < 0) + return NULL; + } + + escaped = cg_escape(u->id); + if (!escaped) + return NULL; + + if (slice) + return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL); + else + return strjoin(u->manager->cgroup_root, "/", escaped, NULL); +} + +int unit_set_cgroup_path(Unit *u, const char *path) { + _cleanup_free_ char *p = NULL; + int r; + + assert(u); + + if (path) { + p = strdup(path); + if (!p) + return -ENOMEM; + } else + p = NULL; + + if (streq_ptr(u->cgroup_path, p)) + return 0; + + if (p) { + r = hashmap_put(u->manager->cgroup_unit, p, u); + if (r < 0) + return r; + } + + unit_release_cgroup(u); + + u->cgroup_path = p; + p = NULL; + + return 1; +} + +int unit_watch_cgroup(Unit *u) { + _cleanup_free_ char *populated = NULL; + int r; + + assert(u); + + if (!u->cgroup_path) + return 0; + + if (u->cgroup_inotify_wd >= 0) + return 0; + + /* Only applies to the unified hierarchy */ + r = cg_unified(); + if (r < 0) + return log_unit_error_errno(u, r, "Failed detect wether the unified hierarchy is used: %m"); + if (r == 0) + return 0; + + /* Don't watch the root slice, it's pointless. */ + if (unit_has_name(u, SPECIAL_ROOT_SLICE)) + return 0; + + r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops); + if (r < 0) + return log_oom(); + + r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.populated", &populated); + if (r < 0) + return log_oom(); + + u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, populated, IN_MODIFY); + if (u->cgroup_inotify_wd < 0) { + + if (errno == ENOENT) /* If the directory is already + * gone we don't need to track + * it, so this is not an error */ + return 0; + + return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path); + } + + r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u); + if (r < 0) + return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m"); + + return 0; +} + +static int unit_create_cgroup( + Unit *u, + CGroupMask target_mask, + CGroupMask enable_mask) { + CGroupContext *c; int r; @@ -643,25 +798,29 @@ static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) { if (!path) return log_oom(); - r = hashmap_put(u->manager->cgroup_unit, path, u); - if (r < 0) { - 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; - } + r = unit_set_cgroup_path(u, path); + if (r == -EEXIST) + return log_unit_error_errno(u, r, "Control group %s exists already.", path); + if (r < 0) + return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path); } /* First, create our own group */ - r = cg_create_everywhere(u->manager->cgroup_supported, mask, u->cgroup_path); + r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path); + if (r < 0) + return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path); + + /* Start watching it */ + (void) unit_watch_cgroup(u); + + /* Enable all controllers we need */ + r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path); if (r < 0) - return log_error_errno(r, "Failed to create cgroup %s: %m", u->cgroup_path); + log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path); /* Keep track that this is now realized */ u->cgroup_realized = true; - u->cgroup_realized_mask = mask; + u->cgroup_realized_mask = target_mask; if (u->type != UNIT_SLICE && !c->delegate) { @@ -670,7 +829,7 @@ static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) { * for slice and delegation units. */ 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); + log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path); } return 0; @@ -691,10 +850,10 @@ int unit_attach_pids_to_cgroup(Unit *u) { return 0; } -static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) { +static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask) { assert(u); - return u->cgroup_realized && u->cgroup_realized_mask == mask; + return u->cgroup_realized && u->cgroup_realized_mask == target_mask; } /* Check if necessary controllers and attributes for a unit are in place. @@ -704,7 +863,7 @@ static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) { * * Returns 0 on success and < 0 on failure. */ static int unit_realize_cgroup_now(Unit *u, ManagerState state) { - CGroupControllerMask mask; + CGroupMask target_mask, enable_mask; int r; assert(u); @@ -714,9 +873,8 @@ static int unit_realize_cgroup_now(Unit *u, ManagerState state) { u->in_cgroup_queue = false; } - mask = unit_get_target_mask(u); - - if (unit_has_mask_realized(u, mask)) + target_mask = unit_get_target_mask(u); + if (unit_has_mask_realized(u, target_mask)) return 0; /* First, realize parents */ @@ -727,12 +885,13 @@ static int unit_realize_cgroup_now(Unit *u, ManagerState state) { } /* And then do the real work */ - r = unit_create_cgroups(u, mask); + enable_mask = unit_get_enable_mask(u); + r = unit_create_cgroup(u, target_mask, enable_mask); if (r < 0) return r; /* Finally, apply the necessary attributes. */ - cgroup_context_apply(unit_get_cgroup_context(u), mask, u->cgroup_path, state); + cgroup_context_apply(unit_get_cgroup_context(u), target_mask, u->cgroup_path, state); return 0; } @@ -759,7 +918,7 @@ unsigned manager_dispatch_cgroup_queue(Manager *m) { 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); + log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id); n++; } @@ -829,39 +988,67 @@ int unit_realize_cgroup(Unit *u) { return unit_realize_cgroup_now(u, manager_state(u->manager)); } -void unit_destroy_cgroup_if_empty(Unit *u) { +void unit_release_cgroup(Unit *u) { + assert(u); + + /* Forgets all cgroup details for this cgroup */ + + if (u->cgroup_path) { + (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); + u->cgroup_path = mfree(u->cgroup_path); + } + + if (u->cgroup_inotify_wd >= 0) { + if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0) + log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id); + + (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd)); + u->cgroup_inotify_wd = -1; + } +} + +void unit_prune_cgroup(Unit *u) { int r; + bool is_root_slice; assert(u); + /* Removes the cgroup, if empty and possible, and stops watching it. */ + if (!u->cgroup_path) return; - r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !unit_has_name(u, SPECIAL_ROOT_SLICE)); + is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE); + + r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice); if (r < 0) { - log_debug_errno(r, "Failed to destroy cgroup %s: %m", u->cgroup_path); + log_debug_errno(r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path); return; } - hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); + if (is_root_slice) + return; + + unit_release_cgroup(u); - free(u->cgroup_path); - u->cgroup_path = NULL; u->cgroup_realized = false; u->cgroup_realized_mask = 0; } -pid_t unit_search_main_pid(Unit *u) { +int unit_search_main_pid(Unit *u, pid_t *ret) { _cleanup_fclose_ FILE *f = NULL; pid_t pid = 0, npid, mypid; + int r; assert(u); + assert(ret); if (!u->cgroup_path) - return 0; + return -ENXIO; - if (cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f) < 0) - return 0; + r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f); + if (r < 0) + return r; mypid = getpid(); while (cg_read_pid(f, &npid) > 0) { @@ -874,90 +1061,274 @@ pid_t unit_search_main_pid(Unit *u) { if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid) continue; - if (pid != 0) { + if (pid != 0) /* Dang, there's more than one daemonized PID in this group, so we don't know what process is the main process. */ - pid = 0; - break; - } + + return -ENODATA; pid = npid; } - return pid; + *ret = pid; + return 0; +} + +static int unit_watch_pids_in_path(Unit *u, const char *path) { + _cleanup_closedir_ DIR *d = NULL; + _cleanup_fclose_ FILE *f = NULL; + int ret = 0, r; + + assert(u); + assert(path); + + r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f); + if (r < 0) + ret = r; + else { + pid_t pid; + + while ((r = cg_read_pid(f, &pid)) > 0) { + r = unit_watch_pid(u, pid); + if (r < 0 && ret >= 0) + ret = r; + } + + if (r < 0 && ret >= 0) + ret = r; + } + + r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d); + if (r < 0) { + if (ret >= 0) + ret = r; + } else { + char *fn; + + while ((r = cg_read_subgroup(d, &fn)) > 0) { + _cleanup_free_ char *p = NULL; + + p = strjoin(path, "/", fn, NULL); + free(fn); + + if (!p) + return -ENOMEM; + + r = unit_watch_pids_in_path(u, p); + if (r < 0 && ret >= 0) + ret = r; + } + + if (r < 0 && ret >= 0) + ret = r; + } + + return ret; +} + +int unit_watch_all_pids(Unit *u) { + assert(u); + + /* Adds all PIDs from our cgroup to the set of PIDs we + * watch. This is a fallback logic for cases where we do not + * get reliable cgroup empty notifications: we try to use + * SIGCHLD as replacement. */ + + if (!u->cgroup_path) + return -ENOENT; + + if (cg_unified() > 0) /* On unified we can use proper notifications */ + return 0; + + return unit_watch_pids_in_path(u, u->cgroup_path); +} + +int unit_notify_cgroup_empty(Unit *u) { + int r; + + assert(u); + + if (!u->cgroup_path) + return 0; + + r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path); + if (r <= 0) + return r; + + unit_add_to_gc_queue(u); + + if (UNIT_VTABLE(u)->notify_cgroup_empty) + UNIT_VTABLE(u)->notify_cgroup_empty(u); + + return 0; +} + +static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { + Manager *m = userdata; + + assert(s); + assert(fd >= 0); + assert(m); + + for (;;) { + union inotify_event_buffer buffer; + struct inotify_event *e; + ssize_t l; + + l = read(fd, &buffer, sizeof(buffer)); + if (l < 0) { + if (errno == EINTR || errno == EAGAIN) + return 0; + + return log_error_errno(errno, "Failed to read control group inotify events: %m"); + } + + FOREACH_INOTIFY_EVENT(e, buffer, l) { + Unit *u; + + if (e->wd < 0) + /* Queue overflow has no watch descriptor */ + continue; + + if (e->mask & IN_IGNORED) + /* The watch was just removed */ + continue; + + u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd)); + if (!u) /* Not that inotify might deliver + * events for a watch even after it + * was removed, because it was queued + * before the removal. Let's ignore + * this here safely. */ + continue; + + (void) unit_notify_cgroup_empty(u); + } + } } int manager_setup_cgroup(Manager *m) { _cleanup_free_ char *path = NULL; - int r; + CGroupController c; + int r, unified; + char *e; assert(m); /* 1. Determine hierarchy */ - free(m->cgroup_root); - m->cgroup_root = NULL; - + m->cgroup_root = mfree(m->cgroup_root); r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); if (r < 0) return log_error_errno(r, "Cannot determine cgroup we are running in: %m"); - /* 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 == MANAGER_SYSTEM) { - char *e; + /* Chop off the init scope, if we are already located in it */ + e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); + /* LEGACY: Also chop off the system slice if we are in + * it. This is to support live upgrades from older systemd + * versions where PID 1 was moved there. Also see + * cg_get_root_path(). */ + if (!e && m->running_as == MANAGER_SYSTEM) { e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); if (!e) - e = endswith(m->cgroup_root, "/system"); - if (e) - *e = 0; + e = endswith(m->cgroup_root, "/system"); /* even more legacy */ } + if (e) + *e = 0; /* And make sure to store away the root value without trailing * slash, even for the root dir, so that we can easily prepend * it everywhere. */ - if (streq(m->cgroup_root, "/")) - m->cgroup_root[0] = 0; + while ((e = endswith(m->cgroup_root, "/"))) + *e = 0; /* 2. Show data */ r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); 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); + unified = cg_unified(); + if (unified < 0) + return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m"); + if (unified > 0) + log_debug("Unified cgroup hierarchy is located at %s.", path); + else + log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); + if (!m->test_run) { + const char *scope_path; /* 3. Install agent */ - if (m->running_as == MANAGER_SYSTEM) { + if (unified) { + + /* In the unified hierarchy we can can get + * cgroup empty notifications via inotify. */ + + m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); + safe_close(m->cgroup_inotify_fd); + + m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); + if (m->cgroup_inotify_fd < 0) + return log_error_errno(errno, "Failed to create control group inotify object: %m"); + + r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m); + if (r < 0) + return log_error_errno(r, "Failed to watch control group inotify object: %m"); + + r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_IDLE - 5); + if (r < 0) + return log_error_errno(r, "Failed to set priority of inotify event source: %m"); + + (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify"); + + } else if (m->running_as == MANAGER_SYSTEM) { + + /* On the legacy hierarchy we only get + * notifications via cgroup agents. (Which + * isn't really reliable, since it does not + * generate events when control groups with + * children run empty. */ + 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 + else if (r == 0) log_debug("Release agent already installed."); } - /* 4. Make sure we are in the root cgroup */ - r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0); + /* 4. Make sure we are in the special "init.scope" unit in the root slice. */ + scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); + r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0); if (r < 0) - return log_error_errno(r, "Failed to create root cgroup hierarchy: %m"); + return log_error_errno(r, "Failed to create %s control group: %m", scope_path); + + /* also, move all other userspace processes remaining + * in the root cgroup into that scope. */ + r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, false); + if (r < 0) + log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m"); /* 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 (m->pin_cgroupfs_fd < 0) return log_error_errno(errno, "Failed to open pin file: %m"); /* 6. Always enable hierarchical support if it exists... */ - cg_set_attribute("memory", "/", "memory.use_hierarchy", "1"); + if (!unified) + (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1"); } /* 7. Figure out which controllers are supported */ - m->cgroup_supported = cg_mask_supported(); + r = cg_mask_supported(&m->cgroup_supported); + if (r < 0) + return log_error_errno(r, "Failed to determine supported controllers: %m"); + + for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) + log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & c)); return 0; } @@ -968,12 +1339,16 @@ void manager_shutdown_cgroup(Manager *m, bool delete) { /* We can't really delete the group, since we are in it. But * let's trim it. */ if (delete && m->cgroup_root) - cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); + (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); + + m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit); + + m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); + m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd); m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd); - free(m->cgroup_root); - m->cgroup_root = NULL; + m->cgroup_root = mfree(m->cgroup_root); } Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { @@ -992,8 +1367,8 @@ Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { char *e; e = strrchr(p, '/'); - if (e == p || !e) - return NULL; + if (!e || e == p) + return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE); *e = 0; @@ -1010,9 +1385,12 @@ Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { assert(m); - if (pid <= 1) + if (pid <= 0) return NULL; + if (pid == 1) + return hashmap_get(m->units, SPECIAL_INIT_SCOPE); + u = hashmap_get(m->watch_pids1, LONG_TO_PTR(pid)); if (u) return u; @@ -1030,7 +1408,6 @@ Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { Unit *u; - int r; assert(m); assert(cgroup); @@ -1039,15 +1416,7 @@ int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { if (!u) return 0; - r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path); - if (r <= 0) - return r; - - if (UNIT_VTABLE(u)->notify_cgroup_empty) - UNIT_VTABLE(u)->notify_cgroup_empty(u); - - unit_add_to_gc_queue(u); - return 0; + return unit_notify_cgroup_empty(u); } int unit_get_memory_current(Unit *u, uint64_t *ret) { @@ -1060,10 +1429,13 @@ int unit_get_memory_current(Unit *u, uint64_t *ret) { if (!u->cgroup_path) return -ENODATA; - if ((u->cgroup_realized_mask & CGROUP_MEMORY) == 0) + if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0) return -ENODATA; - r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v); + if (cg_unified() <= 0) + r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v); + else + r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v); if (r == -ENOENT) return -ENODATA; if (r < 0) @@ -1083,7 +1455,7 @@ static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) { if (!u->cgroup_path) return -ENODATA; - if ((u->cgroup_realized_mask & CGROUP_CPUACCT) == 0) + if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0) return -ENODATA; r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v); |