/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include "sd-daemon.h" #include "bus-log-control-api.h" #include "bus-util.h" #include "bus-polkit.h" #include "cgroup-util.h" #include "fd-util.h" #include "fileio.h" #include "format-util.h" #include "memory-util.h" #include "memstream-util.h" #include "oomd-manager-bus.h" #include "oomd-manager.h" #include "path-util.h" #include "percent-util.h" #include "varlink-io.systemd.oom.h" typedef struct ManagedOOMMessage { ManagedOOMMode mode; char *path; char *property; uint32_t limit; } ManagedOOMMessage; static void managed_oom_message_destroy(ManagedOOMMessage *message) { assert(message); free(message->path); free(message->property); } static int managed_oom_mode(const char *name, JsonVariant *v, JsonDispatchFlags flags, void *userdata) { ManagedOOMMode *mode = userdata, m; const char *s; assert(mode); assert_se(s = json_variant_string(v)); m = managed_oom_mode_from_string(s); if (m < 0) return json_log(v, flags, m, "%s is not a valid ManagedOOMMode", s); *mode = m; return 0; } static int process_managed_oom_message(Manager *m, uid_t uid, JsonVariant *parameters) { JsonVariant *c, *cgroups; int r; static const JsonDispatch dispatch_table[] = { { "mode", JSON_VARIANT_STRING, managed_oom_mode, offsetof(ManagedOOMMessage, mode), JSON_MANDATORY }, { "path", JSON_VARIANT_STRING, json_dispatch_string, offsetof(ManagedOOMMessage, path), JSON_MANDATORY }, { "property", JSON_VARIANT_STRING, json_dispatch_string, offsetof(ManagedOOMMessage, property), JSON_MANDATORY }, { "limit", _JSON_VARIANT_TYPE_INVALID, json_dispatch_uint32, offsetof(ManagedOOMMessage, limit), 0 }, {}, }; assert(m); assert(parameters); cgroups = json_variant_by_key(parameters, "cgroups"); if (!cgroups) return -EINVAL; /* Skip malformed elements and keep processing in case the others are good */ JSON_VARIANT_ARRAY_FOREACH(c, cgroups) { _cleanup_(managed_oom_message_destroy) ManagedOOMMessage message = {}; OomdCGroupContext *ctx; Hashmap *monitor_hm; loadavg_t limit; if (!json_variant_is_object(c)) continue; r = json_dispatch(c, dispatch_table, 0, &message); if (r == -ENOMEM) return r; if (r < 0) continue; if (uid != 0) { uid_t cg_uid; r = cg_path_get_owner_uid(message.path, &cg_uid); if (r < 0) { log_debug_errno(r, "Failed to get cgroup %s owner uid: %m", message.path); continue; } /* Let's not be lenient for permission errors and skip processing if we receive an * update for a cgroup that doesn't belong to the user. */ if (uid != cg_uid) return log_error_errno(SYNTHETIC_ERRNO(EPERM), "cgroup path owner UID does not match sender uid " "(" UID_FMT " != " UID_FMT ")", uid, cg_uid); } monitor_hm = streq(message.property, "ManagedOOMSwap") ? m->monitored_swap_cgroup_contexts : m->monitored_mem_pressure_cgroup_contexts; if (message.mode == MANAGED_OOM_AUTO) { (void) oomd_cgroup_context_free(hashmap_remove(monitor_hm, empty_to_root(message.path))); continue; } limit = m->default_mem_pressure_limit; if (streq(message.property, "ManagedOOMMemoryPressure") && message.limit > 0) { int permyriad = UINT32_SCALE_TO_PERMYRIAD(message.limit); r = store_loadavg_fixed_point(permyriad / 100LU, permyriad % 100LU, &limit); if (r < 0) continue; } r = oomd_insert_cgroup_context(NULL, monitor_hm, message.path); if (r == -ENOMEM) return r; if (r < 0 && r != -EEXIST) log_debug_errno(r, "Failed to insert message, ignoring: %m"); /* Always update the limit in case it was changed. For non-memory pressure detection the value is * ignored so always updating it here is not a problem. */ ctx = hashmap_get(monitor_hm, empty_to_root(message.path)); if (ctx) ctx->mem_pressure_limit = limit; } /* Toggle wake-ups for "ManagedOOMSwap" if entries are present. */ r = sd_event_source_set_enabled(m->swap_context_event_source, hashmap_isempty(m->monitored_swap_cgroup_contexts) ? SD_EVENT_OFF : SD_EVENT_ON); if (r < 0) return log_error_errno(r, "Failed to toggle enabled state of swap context source: %m"); return 0; } static int process_managed_oom_request( Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) { Manager *m = ASSERT_PTR(userdata); uid_t uid; int r; r = varlink_get_peer_uid(link, &uid); if (r < 0) return log_error_errno(r, "Failed to get varlink peer uid: %m"); return process_managed_oom_message(m, uid, parameters); } static int process_managed_oom_reply( Varlink *link, JsonVariant *parameters, const char *error_id, VarlinkReplyFlags flags, void *userdata) { Manager *m = ASSERT_PTR(userdata); uid_t uid; int r; if (error_id) { r = -EIO; log_debug("Error getting ManagedOOM cgroups: %s", error_id); goto finish; } r = varlink_get_peer_uid(link, &uid); if (r < 0) { log_error_errno(r, "Failed to get varlink peer uid: %m"); goto finish; } r = process_managed_oom_message(m, uid, parameters); finish: if (!FLAGS_SET(flags, VARLINK_REPLY_CONTINUES)) m->varlink_client = varlink_close_unref(link); return r; } /* Fill 'new_h' with 'path's descendant OomdCGroupContexts. Only include descendant cgroups that are possible * candidates for action. That is, only leaf cgroups or cgroups with memory.oom.group set to "1". * * This function ignores most errors in order to handle cgroups that may have been cleaned up while * populating the hashmap. * * 'new_h' is of the form { key: cgroup paths -> value: OomdCGroupContext } */ static int recursively_get_cgroup_context(Hashmap *new_h, const char *path) { _cleanup_free_ char *subpath = NULL; _cleanup_closedir_ DIR *d = NULL; int r; assert(new_h); assert(path); r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d); if (r < 0) return r; r = cg_read_subgroup(d, &subpath); if (r < 0) return r; else if (r == 0) { /* No subgroups? We're a leaf node */ r = oomd_insert_cgroup_context(NULL, new_h, path); if (r == -ENOMEM) return r; if (r < 0) log_debug_errno(r, "Failed to insert context for %s, ignoring: %m", path); return 0; } do { _cleanup_free_ char *cg_path = NULL; bool oom_group; cg_path = path_join(empty_to_root(path), subpath); if (!cg_path) return -ENOMEM; subpath = mfree(subpath); r = cg_get_attribute_as_bool("memory", cg_path, "memory.oom.group", &oom_group); /* The cgroup might be gone. Skip it as a candidate since we can't get information on it. */ if (r == -ENOMEM) return r; if (r < 0) { log_debug_errno(r, "Failed to read memory.oom.group from %s, ignoring: %m", cg_path); return 0; } if (oom_group) r = oomd_insert_cgroup_context(NULL, new_h, cg_path); else r = recursively_get_cgroup_context(new_h, cg_path); if (r == -ENOMEM) return r; if (r < 0) log_debug_errno(r, "Failed to insert or recursively get from %s, ignoring: %m", cg_path); } while ((r = cg_read_subgroup(d, &subpath)) > 0); return 0; } static int update_monitored_cgroup_contexts(Hashmap **monitored_cgroups) { _cleanup_hashmap_free_ Hashmap *new_base = NULL; OomdCGroupContext *ctx; int r; assert(monitored_cgroups); new_base = hashmap_new(&oomd_cgroup_ctx_hash_ops); if (!new_base) return -ENOMEM; HASHMAP_FOREACH(ctx, *monitored_cgroups) { /* Skip most errors since the cgroup we're trying to update might not exist anymore. */ r = oomd_insert_cgroup_context(*monitored_cgroups, new_base, ctx->path); if (r == -ENOMEM) return r; if (r < 0 && !IN_SET(r, -EEXIST, -ENOENT)) log_debug_errno(r, "Failed to insert context for %s, ignoring: %m", ctx->path); } hashmap_free(*monitored_cgroups); *monitored_cgroups = TAKE_PTR(new_base); return 0; } static int get_monitored_cgroup_contexts_candidates(Hashmap *monitored_cgroups, Hashmap **ret_candidates) { _cleanup_hashmap_free_ Hashmap *candidates = NULL; OomdCGroupContext *ctx; int r; assert(monitored_cgroups); assert(ret_candidates); candidates = hashmap_new(&oomd_cgroup_ctx_hash_ops); if (!candidates) return -ENOMEM; HASHMAP_FOREACH(ctx, monitored_cgroups) { r = recursively_get_cgroup_context(candidates, ctx->path); if (r == -ENOMEM) return r; if (r < 0) log_debug_errno(r, "Failed to recursively get contexts for %s, ignoring: %m", ctx->path); } *ret_candidates = TAKE_PTR(candidates); return 0; } static int update_monitored_cgroup_contexts_candidates(Hashmap *monitored_cgroups, Hashmap **candidates) { _cleanup_hashmap_free_ Hashmap *new_candidates = NULL; int r; assert(monitored_cgroups); assert(candidates); assert(*candidates); r = get_monitored_cgroup_contexts_candidates(monitored_cgroups, &new_candidates); if (r < 0) return log_debug_errno(r, "Failed to get candidate contexts: %m"); oomd_update_cgroup_contexts_between_hashmaps(*candidates, new_candidates); hashmap_free(*candidates); *candidates = TAKE_PTR(new_candidates); return 0; } static int acquire_managed_oom_connect(Manager *m) { _cleanup_(varlink_close_unrefp) Varlink *link = NULL; int r; assert(m); assert(m->event); r = varlink_connect_address(&link, VARLINK_ADDR_PATH_MANAGED_OOM_SYSTEM); if (r < 0) return log_error_errno(r, "Failed to connect to " VARLINK_ADDR_PATH_MANAGED_OOM_SYSTEM ": %m"); (void) varlink_set_userdata(link, m); (void) varlink_set_description(link, "oomd"); (void) varlink_set_relative_timeout(link, USEC_INFINITY); r = varlink_attach_event(link, m->event, SD_EVENT_PRIORITY_NORMAL); if (r < 0) return log_error_errno(r, "Failed to attach varlink connection to event loop: %m"); r = varlink_bind_reply(link, process_managed_oom_reply); if (r < 0) return log_error_errno(r, "Failed to bind reply callback: %m"); r = varlink_observe(link, "io.systemd.ManagedOOM.SubscribeManagedOOMCGroups", NULL); if (r < 0) return log_error_errno(r, "Failed to observe varlink call: %m"); m->varlink_client = TAKE_PTR(link); return 0; } static int monitor_swap_contexts_handler(sd_event_source *s, uint64_t usec, void *userdata) { Manager *m = ASSERT_PTR(userdata); usec_t usec_now; int r; assert(s); assert(!hashmap_isempty(m->monitored_swap_cgroup_contexts)); /* Reset timer */ r = sd_event_now(sd_event_source_get_event(s), CLOCK_MONOTONIC, &usec_now); if (r < 0) return log_error_errno(r, "Failed to reset event timer: %m"); r = sd_event_source_set_time_relative(s, SWAP_INTERVAL_USEC); if (r < 0) return log_error_errno(r, "Failed to set relative time for timer: %m"); /* Reconnect if our connection dropped */ if (!m->varlink_client) { r = acquire_managed_oom_connect(m); if (r < 0) return log_error_errno(r, "Failed to acquire varlink connection: %m"); } /* We still try to acquire system information for oomctl even if no units want swap monitoring */ r = oomd_system_context_acquire("/proc/meminfo", &m->system_context); /* If there are no units depending on swap actions, the only error we exit on is ENOMEM. */ if (r < 0) return log_error_errno(r, "Failed to acquire system context: %m"); /* Note that m->monitored_swap_cgroup_contexts does not need to be updated every interval because only the * system context is used for deciding whether the swap threshold is hit. m->monitored_swap_cgroup_contexts * is only used to decide which cgroups to kill (and even then only the resource usages of its descendent * nodes are the ones that matter). */ /* Check amount of memory available and swap free so we don't free up swap when memory is still available. */ if (oomd_mem_available_below(&m->system_context, 10000 - m->swap_used_limit_permyriad) && oomd_swap_free_below(&m->system_context, 10000 - m->swap_used_limit_permyriad)) { _cleanup_hashmap_free_ Hashmap *candidates = NULL; _cleanup_free_ char *selected = NULL; uint64_t threshold; log_debug("Memory used (%"PRIu64") / total (%"PRIu64") and " "swap used (%"PRIu64") / total (%"PRIu64") is more than " PERMYRIAD_AS_PERCENT_FORMAT_STR, m->system_context.mem_used, m->system_context.mem_total, m->system_context.swap_used, m->system_context.swap_total, PERMYRIAD_AS_PERCENT_FORMAT_VAL(m->swap_used_limit_permyriad)); r = get_monitored_cgroup_contexts_candidates(m->monitored_swap_cgroup_contexts, &candidates); if (r == -ENOMEM) return log_oom(); if (r < 0) log_debug_errno(r, "Failed to get monitored swap cgroup candidates, ignoring: %m"); threshold = m->system_context.swap_total * THRESHOLD_SWAP_USED_PERCENT / 100; r = oomd_kill_by_swap_usage(candidates, threshold, m->dry_run, &selected); if (r == -ENOMEM) return log_oom(); if (r < 0) log_notice_errno(r, "Failed to kill any cgroups based on swap: %m"); else { if (selected && r > 0) { log_notice("Killed %s due to memory used (%"PRIu64") / total (%"PRIu64") and " "swap used (%"PRIu64") / total (%"PRIu64") being more than " PERMYRIAD_AS_PERCENT_FORMAT_STR, selected, m->system_context.mem_used, m->system_context.mem_total, m->system_context.swap_used, m->system_context.swap_total, PERMYRIAD_AS_PERCENT_FORMAT_VAL(m->swap_used_limit_permyriad)); /* send dbus signal */ (void) sd_bus_emit_signal(m->bus, "/org/freedesktop/oom1", "org.freedesktop.oom1.Manager", "Killed", "ss", selected, "memory-used"); } return 0; } } return 0; } static void clear_candidate_hashmapp(Manager **m) { if (*m) hashmap_clear((*m)->monitored_mem_pressure_cgroup_contexts_candidates); } static int monitor_memory_pressure_contexts_handler(sd_event_source *s, uint64_t usec, void *userdata) { /* Don't want to use stale candidate data. Setting this will clear the candidate hashmap on return unless we * update the candidate data (in which case clear_candidates will be NULL). */ _unused_ _cleanup_(clear_candidate_hashmapp) Manager *clear_candidates = userdata; _cleanup_set_free_ Set *targets = NULL; bool in_post_action_delay = false; Manager *m = ASSERT_PTR(userdata); usec_t usec_now; int r; assert(s); /* Reset timer */ r = sd_event_now(sd_event_source_get_event(s), CLOCK_MONOTONIC, &usec_now); if (r < 0) return log_error_errno(r, "Failed to reset event timer: %m"); r = sd_event_source_set_time_relative(s, MEM_PRESSURE_INTERVAL_USEC); if (r < 0) return log_error_errno(r, "Failed to set relative time for timer: %m"); /* Reconnect if our connection dropped */ if (!m->varlink_client) { r = acquire_managed_oom_connect(m); if (r < 0) return log_error_errno(r, "Failed to acquire varlink connection: %m"); } /* Return early if nothing is requesting memory pressure monitoring */ if (hashmap_isempty(m->monitored_mem_pressure_cgroup_contexts)) return 0; /* Update the cgroups used for detection/action */ r = update_monitored_cgroup_contexts(&m->monitored_mem_pressure_cgroup_contexts); if (r == -ENOMEM) return log_oom(); if (r < 0) log_debug_errno(r, "Failed to update monitored memory pressure cgroup contexts, ignoring: %m"); /* Since pressure counters are lagging, we need to wait a bit after a kill to ensure we don't read stale * values and go on a kill storm. */ if (m->mem_pressure_post_action_delay_start > 0) { if (m->mem_pressure_post_action_delay_start + POST_ACTION_DELAY_USEC > usec_now) in_post_action_delay = true; else m->mem_pressure_post_action_delay_start = 0; } r = oomd_pressure_above(m->monitored_mem_pressure_cgroup_contexts, m->default_mem_pressure_duration_usec, &targets); if (r == -ENOMEM) return log_oom(); if (r < 0) log_debug_errno(r, "Failed to check if memory pressure exceeded limits, ignoring: %m"); else if (r == 1 && !in_post_action_delay) { OomdCGroupContext *t; SET_FOREACH(t, targets) { _cleanup_free_ char *selected = NULL; /* Check if there was reclaim activity in the given interval. The concern is the following case: * Pressure climbed, a lot of high-frequency pages were reclaimed, and we killed the offending * cgroup. Even after this, well-behaved processes will fault in recently resident pages and * this will cause pressure to remain high. Thus if there isn't any reclaim pressure, no need * to kill something (it won't help anyways). */ if ((now(CLOCK_MONOTONIC) - t->last_had_mem_reclaim) > RECLAIM_DURATION_USEC) continue; log_debug("Memory pressure for %s is %lu.%02lu%% > %lu.%02lu%% for > %s with reclaim activity", t->path, LOADAVG_INT_SIDE(t->memory_pressure.avg10), LOADAVG_DECIMAL_SIDE(t->memory_pressure.avg10), LOADAVG_INT_SIDE(t->mem_pressure_limit), LOADAVG_DECIMAL_SIDE(t->mem_pressure_limit), FORMAT_TIMESPAN(m->default_mem_pressure_duration_usec, USEC_PER_SEC)); r = update_monitored_cgroup_contexts_candidates( m->monitored_mem_pressure_cgroup_contexts, &m->monitored_mem_pressure_cgroup_contexts_candidates); if (r == -ENOMEM) return log_oom(); if (r < 0) log_debug_errno(r, "Failed to update monitored memory pressure candidate cgroup contexts, ignoring: %m"); else clear_candidates = NULL; r = oomd_kill_by_pgscan_rate(m->monitored_mem_pressure_cgroup_contexts_candidates, /* prefix= */ t->path, /* dry_run= */ m->dry_run, &selected); if (r == -ENOMEM) return log_oom(); if (r < 0) log_notice_errno(r, "Failed to kill any cgroups under %s based on pressure: %m", t->path); else { /* Don't act on all the high pressure cgroups at once; return as soon as we kill one. * If r == 0 then it means there were not eligible candidates, the candidate cgroup * disappeared, or the candidate cgroup has no processes by the time we tried to kill * it. In either case, go through the event loop again and select a new candidate if * pressure is still high. */ m->mem_pressure_post_action_delay_start = usec_now; if (selected && r > 0) { log_notice("Killed %s due to memory pressure for %s being %lu.%02lu%% > %lu.%02lu%%" " for > %s with reclaim activity", selected, t->path, LOADAVG_INT_SIDE(t->memory_pressure.avg10), LOADAVG_DECIMAL_SIDE(t->memory_pressure.avg10), LOADAVG_INT_SIDE(t->mem_pressure_limit), LOADAVG_DECIMAL_SIDE(t->mem_pressure_limit), FORMAT_TIMESPAN(m->default_mem_pressure_duration_usec, USEC_PER_SEC)); /* send dbus signal */ (void) sd_bus_emit_signal(m->bus, "/org/freedesktop/oom1", "org.freedesktop.oom1.Manager", "Killed", "ss", selected, "memory-pressure"); } return 0; } } } else { /* If any monitored cgroup is over their pressure limit, get all the kill candidates for every * monitored cgroup. This saves CPU cycles from doing it every interval by only doing it when a kill * might happen. * Candidate cgroup data will continue to get updated during the post-action delay period in case * pressure continues to be high after a kill. */ OomdCGroupContext *c; HASHMAP_FOREACH(c, m->monitored_mem_pressure_cgroup_contexts) { if (c->mem_pressure_limit_hit_start == 0) continue; r = update_monitored_cgroup_contexts_candidates( m->monitored_mem_pressure_cgroup_contexts, &m->monitored_mem_pressure_cgroup_contexts_candidates); if (r == -ENOMEM) return log_oom(); if (r < 0) log_debug_errno(r, "Failed to update monitored memory pressure candidate cgroup contexts, ignoring: %m"); else { clear_candidates = NULL; break; } } } return 0; } static int monitor_swap_contexts(Manager *m) { _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL; int r; assert(m); assert(m->event); r = sd_event_add_time(m->event, &s, CLOCK_MONOTONIC, 0, 0, monitor_swap_contexts_handler, m); if (r < 0) return r; r = sd_event_source_set_exit_on_failure(s, true); if (r < 0) return r; r = sd_event_source_set_enabled(s, SD_EVENT_OFF); if (r < 0) return r; (void) sd_event_source_set_description(s, "oomd-swap-timer"); m->swap_context_event_source = TAKE_PTR(s); return 0; } static int monitor_memory_pressure_contexts(Manager *m) { _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL; int r; assert(m); assert(m->event); r = sd_event_add_time(m->event, &s, CLOCK_MONOTONIC, 0, 0, monitor_memory_pressure_contexts_handler, m); if (r < 0) return r; r = sd_event_source_set_exit_on_failure(s, true); if (r < 0) return r; r = sd_event_source_set_enabled(s, SD_EVENT_ON); if (r < 0) return r; (void) sd_event_source_set_description(s, "oomd-memory-pressure-timer"); m->mem_pressure_context_event_source = TAKE_PTR(s); return 0; } Manager* manager_free(Manager *m) { assert(m); varlink_server_unref(m->varlink_server); varlink_close_unref(m->varlink_client); sd_event_source_unref(m->swap_context_event_source); sd_event_source_unref(m->mem_pressure_context_event_source); sd_event_unref(m->event); bus_verify_polkit_async_registry_free(m->polkit_registry); sd_bus_flush_close_unref(m->bus); hashmap_free(m->monitored_swap_cgroup_contexts); hashmap_free(m->monitored_mem_pressure_cgroup_contexts); hashmap_free(m->monitored_mem_pressure_cgroup_contexts_candidates); return mfree(m); } int manager_new(Manager **ret) { _cleanup_(manager_freep) Manager *m = NULL; int r; assert(ret); m = new0(Manager, 1); if (!m) return -ENOMEM; r = sd_event_default(&m->event); if (r < 0) return r; (void) sd_event_set_watchdog(m->event, true); r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); if (r < 0) return r; r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); if (r < 0) return r; m->monitored_swap_cgroup_contexts = hashmap_new(&oomd_cgroup_ctx_hash_ops); if (!m->monitored_swap_cgroup_contexts) return -ENOMEM; m->monitored_mem_pressure_cgroup_contexts = hashmap_new(&oomd_cgroup_ctx_hash_ops); if (!m->monitored_mem_pressure_cgroup_contexts) return -ENOMEM; m->monitored_mem_pressure_cgroup_contexts_candidates = hashmap_new(&oomd_cgroup_ctx_hash_ops); if (!m->monitored_mem_pressure_cgroup_contexts_candidates) return -ENOMEM; *ret = TAKE_PTR(m); return 0; } static int manager_connect_bus(Manager *m) { int r; assert(m); assert(!m->bus); r = bus_open_system_watch_bind_with_description(&m->bus, "bus-api-oom"); if (r < 0) return log_error_errno(r, "Failed to connect to bus: %m"); r = bus_add_implementation(m->bus, &manager_object, m); if (r < 0) return r; r = bus_log_control_api_register(m->bus); if (r < 0) return r; r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.oom1", 0, NULL, NULL); if (r < 0) return log_error_errno(r, "Failed to request name: %m"); r = sd_bus_attach_event(m->bus, m->event, 0); if (r < 0) return log_error_errno(r, "Failed to attach bus to event loop: %m"); return 0; } static int manager_varlink_init(Manager *m, int fd) { _cleanup_(varlink_server_unrefp) VarlinkServer *s = NULL; int r; assert(m); assert(!m->varlink_server); r = varlink_server_new(&s, VARLINK_SERVER_ACCOUNT_UID|VARLINK_SERVER_INHERIT_USERDATA); if (r < 0) return log_error_errno(r, "Failed to allocate varlink server object: %m"); varlink_server_set_userdata(s, m); r = varlink_server_add_interface(s, &vl_interface_io_systemd_oom); if (r < 0) return log_error_errno(r, "Failed to add oom interface to varlink server: %m"); r = varlink_server_bind_method(s, "io.systemd.oom.ReportManagedOOMCGroups", process_managed_oom_request); if (r < 0) return log_error_errno(r, "Failed to register varlink method: %m"); if (fd < 0) r = varlink_server_listen_address(s, VARLINK_ADDR_PATH_MANAGED_OOM_USER, 0666); else r = varlink_server_listen_fd(s, fd); if (r < 0) return log_error_errno(r, "Failed to bind to varlink socket: %m"); r = varlink_server_attach_event(s, m->event, SD_EVENT_PRIORITY_NORMAL); if (r < 0) return log_error_errno(r, "Failed to attach varlink connection to event loop: %m"); log_debug("Initialized systemd-oomd varlink server"); m->varlink_server = TAKE_PTR(s); return 0; } int manager_start( Manager *m, bool dry_run, int swap_used_limit_permyriad, int mem_pressure_limit_permyriad, usec_t mem_pressure_usec, int fd) { unsigned long l, f; int r; assert(m); m->dry_run = dry_run; m->swap_used_limit_permyriad = swap_used_limit_permyriad >= 0 ? swap_used_limit_permyriad : DEFAULT_SWAP_USED_LIMIT_PERCENT * 100; assert(m->swap_used_limit_permyriad <= 10000); if (mem_pressure_limit_permyriad >= 0) { assert(mem_pressure_limit_permyriad <= 10000); l = mem_pressure_limit_permyriad / 100; f = mem_pressure_limit_permyriad % 100; } else { l = DEFAULT_MEM_PRESSURE_LIMIT_PERCENT; f = 0; } r = store_loadavg_fixed_point(l, f, &m->default_mem_pressure_limit); if (r < 0) return r; m->default_mem_pressure_duration_usec = mem_pressure_usec ?: DEFAULT_MEM_PRESSURE_DURATION_USEC; r = manager_connect_bus(m); if (r < 0) return r; r = acquire_managed_oom_connect(m); if (r < 0) return r; r = manager_varlink_init(m, fd); if (r < 0) return r; r = monitor_memory_pressure_contexts(m); if (r < 0) return r; r = monitor_swap_contexts(m); if (r < 0) return r; return 0; } int manager_get_dump_string(Manager *m, char **ret) { _cleanup_(memstream_done) MemStream ms = {}; OomdCGroupContext *c; FILE *f; assert(m); assert(ret); f = memstream_init(&ms); if (!f) return -ENOMEM; fprintf(f, "Dry Run: %s\n" "Swap Used Limit: " PERMYRIAD_AS_PERCENT_FORMAT_STR "\n" "Default Memory Pressure Limit: %lu.%02lu%%\n" "Default Memory Pressure Duration: %s\n" "System Context:\n", yes_no(m->dry_run), PERMYRIAD_AS_PERCENT_FORMAT_VAL(m->swap_used_limit_permyriad), LOADAVG_INT_SIDE(m->default_mem_pressure_limit), LOADAVG_DECIMAL_SIDE(m->default_mem_pressure_limit), FORMAT_TIMESPAN(m->default_mem_pressure_duration_usec, USEC_PER_SEC)); oomd_dump_system_context(&m->system_context, f, "\t"); fprintf(f, "Swap Monitored CGroups:\n"); HASHMAP_FOREACH(c, m->monitored_swap_cgroup_contexts) oomd_dump_swap_cgroup_context(c, f, "\t"); fprintf(f, "Memory Pressure Monitored CGroups:\n"); HASHMAP_FOREACH(c, m->monitored_mem_pressure_cgroup_contexts) oomd_dump_memory_pressure_cgroup_context(c, f, "\t"); return memstream_finalize(&ms, ret, NULL); }