Daan De Meyer
064a5c1438
Compared to PID1 where systemd-oomd has to be the client to PID1 because PID1 is a more privileged process than systemd-oomd, systemd-oomd is the more privileged process compared to a user manager so we have user managers be the client whereas systemd-oomd is now the server. The same varlink protocol is used between user managers and systemd-oomd to deliver ManagedOOM property updates. systemd-oomd now sets up a varlink server that user managers connect to to send ManagedOOM property updates. We also add extra validation to make sure that non-root senders don't send updates for cgroups they don't own. The integration test was extended to repeat the chill/bloat test using a user manager instead of PID1.
74 lines
2.7 KiB
C
74 lines
2.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "sd-bus.h"
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#include "sd-event.h"
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#include "conf-parser.h"
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#include "oomd-util.h"
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#include "varlink.h"
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/* Polling interval for monitoring stats */
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#define SWAP_INTERVAL_USEC 150000 /* 0.15 seconds */
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/* Pressure counters are lagging (~2 seconds) compared to swap so polling too frequently just wastes CPU */
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#define MEM_PRESSURE_INTERVAL_USEC (1 * USEC_PER_SEC)
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/* Take action if 10s of memory pressure > 60 for more than 30s. We use the "full" value from PSI so this is the
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* percentage of time all tasks were delayed (i.e. unproductive).
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* Generally 60 or higher might be acceptable for something like system.slice with no memory.high set; processes in
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* system.slice are assumed to be less latency sensitive. */
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#define DEFAULT_MEM_PRESSURE_DURATION_USEC (30 * USEC_PER_SEC)
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#define DEFAULT_MEM_PRESSURE_LIMIT_PERCENT 60
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#define DEFAULT_SWAP_USED_LIMIT_PERCENT 90
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/* Only tackle candidates with large swap usage. */
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#define THRESHOLD_SWAP_USED_PERCENT 5
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#define RECLAIM_DURATION_USEC (30 * USEC_PER_SEC)
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#define POST_ACTION_DELAY_USEC (15 * USEC_PER_SEC)
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typedef struct Manager Manager;
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struct Manager {
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sd_bus *bus;
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sd_event *event;
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Hashmap *polkit_registry;
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bool dry_run;
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int swap_used_limit_permyriad;
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loadavg_t default_mem_pressure_limit;
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usec_t default_mem_pressure_duration_usec;
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/* k: cgroup paths -> v: OomdCGroupContext
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* Used to detect when to take action. */
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Hashmap *monitored_swap_cgroup_contexts;
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Hashmap *monitored_mem_pressure_cgroup_contexts;
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Hashmap *monitored_mem_pressure_cgroup_contexts_candidates;
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OomdSystemContext system_context;
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usec_t mem_pressure_post_action_delay_start;
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sd_event_source *swap_context_event_source;
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sd_event_source *mem_pressure_context_event_source;
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/* This varlink object is used to manage the subscription from systemd-oomd to PID1 which it uses to
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* listen for changes in ManagedOOM settings (oomd client - systemd server). */
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Varlink *varlink_client;
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/* This varlink server object is used to manage systemd-oomd's varlink server which is used by user
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* managers to report changes in ManagedOOM settings (oomd server - systemd client). */
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VarlinkServer *varlink_server;
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};
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Manager* manager_free(Manager *m);
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DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
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int manager_new(Manager **ret);
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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);
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int manager_get_dump_string(Manager *m, char **ret);
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CONFIG_PARSER_PROTOTYPE(config_parse_oomd_default);
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