Matteo Croce
c1bf450fa0
When a cgroup is selected for termination, send varlink messages to hooks registered in `/run/systemd/oomd.prekill-hooks/`. oomd waits up to `PreKillHookTimeoutSec=` seconds for response before proceeding with the kill.
73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
|
#pragma once
|
|
|
|
#include "conf-parser-forward.h"
|
|
#include "shared-forward.h"
|
|
#include "oomd-conf.h"
|
|
#include "oomd-util.h"
|
|
|
|
/* Polling interval for monitoring stats */
|
|
#define SWAP_INTERVAL_USEC 150000 /* 0.15 seconds */
|
|
/* Pressure counters are lagging (~2 seconds) compared to swap so polling too frequently just wastes CPU */
|
|
#define MEM_PRESSURE_INTERVAL_USEC (1 * USEC_PER_SEC)
|
|
|
|
/* Take action if 10s of memory pressure > 60 for more than 30s. We use the "full" value from PSI so this is the
|
|
* percentage of time all tasks were delayed (i.e. unproductive).
|
|
* Generally 60 or higher might be acceptable for something like system.slice with no memory.high set; processes in
|
|
* system.slice are assumed to be less latency sensitive. */
|
|
#define DEFAULT_MEM_PRESSURE_DURATION_USEC (30 * USEC_PER_SEC)
|
|
#define DEFAULT_MEM_PRESSURE_LIMIT_PERCENT 60
|
|
#define DEFAULT_SWAP_USED_LIMIT_PERCENT 90
|
|
|
|
/* Only tackle candidates with large swap usage. */
|
|
#define THRESHOLD_SWAP_USED_PERCENT 5
|
|
|
|
#define RECLAIM_DURATION_USEC (30 * USEC_PER_SEC)
|
|
#define POST_ACTION_DELAY_USEC (15 * USEC_PER_SEC)
|
|
|
|
typedef struct Manager {
|
|
sd_bus *bus;
|
|
sd_event *event;
|
|
|
|
Hashmap *polkit_registry;
|
|
|
|
bool dry_run;
|
|
int swap_used_limit_permyriad;
|
|
loadavg_t default_mem_pressure_limit;
|
|
usec_t default_mem_pressure_duration_usec;
|
|
|
|
/* k: cgroup paths -> v: OomdCGroupContext
|
|
* Used to detect when to take action. */
|
|
Hashmap *monitored_swap_cgroup_contexts;
|
|
Hashmap *monitored_mem_pressure_cgroup_contexts;
|
|
Hashmap *monitored_mem_pressure_cgroup_contexts_candidates;
|
|
|
|
OomdSystemContext system_context;
|
|
|
|
usec_t mem_pressure_post_action_delay_start;
|
|
|
|
sd_event_source *swap_context_event_source;
|
|
sd_event_source *mem_pressure_context_event_source;
|
|
|
|
/* This varlink object is used to manage the subscription from systemd-oomd to PID1 which it uses to
|
|
* listen for changes in ManagedOOM settings (oomd client - systemd server). */
|
|
sd_varlink *varlink_client;
|
|
/* This varlink server object is used to manage systemd-oomd's varlink server which is used by user
|
|
* managers to report changes in ManagedOOM settings (oomd server - systemd client). */
|
|
sd_varlink_server *varlink_server;
|
|
|
|
usec_t prekill_timeout;
|
|
Set *kill_states; /* currently ongoing OomdKillState operations */
|
|
} Manager;
|
|
|
|
Manager* manager_free(Manager *m);
|
|
DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
|
|
|
|
int manager_new(Manager **ret);
|
|
|
|
int manager_start(Manager *m, bool dry_run, int fd);
|
|
|
|
int manager_get_dump_string(Manager *m, char **ret);
|
|
|
|
CONFIG_PARSER_PROTOTYPE(config_parse_oomd_default);
|