src/oom/oomd-manager.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 #include "conf-parser.h"
   5 #include "oomd-util.h"
   6 #include "sd-event.h"
   7 #include "varlink.h"
   8
   9 /* Polling interval for monitoring stats */
  10 #define INTERVAL_USEC (1 * USEC_PER_SEC)
  11
  12 /* Used to weight the averages */
  13 #define AVERAGE_SIZE_DECAY 4
  14
  15 /* Take action if 10s of memory pressure > 60 for more than 30s. We use the "full" value from PSI so this is the
  16  * percentage of time all tasks were delayed (i.e. unproductive).
  17  * Generally 60 or higher might be acceptable for something like system.slice with no memory.high set; processes in
  18  * system.slice are assumed to be less latency sensitive. */
  19 #define DEFAULT_MEM_PRESSURE_DURATION_USEC (30 * USEC_PER_SEC)
  20 #define DEFAULT_MEM_PRESSURE_LIMIT_PERCENT 60
  21 #define DEFAULT_SWAP_USED_LIMIT_PERCENT 90
  22
  23 #define RECLAIM_DURATION_USEC (30 * USEC_PER_SEC)
  24 #define POST_ACTION_DELAY_USEC (15 * USEC_PER_SEC)
  25
  26 typedef struct Manager Manager;
  27
  28 struct Manager {
  29         sd_bus *bus;
  30         sd_event *event;
  31
  32         Hashmap *polkit_registry;
  33
  34         bool dry_run;
  35         int swap_used_limit_permyriad;
  36         loadavg_t default_mem_pressure_limit;
  37         usec_t default_mem_pressure_duration_usec;
  38
  39         /* k: cgroup paths -> v: OomdCGroupContext
  40          * Used to detect when to take action. */
  41         Hashmap *monitored_swap_cgroup_contexts;
  42         Hashmap *monitored_mem_pressure_cgroup_contexts;
  43
  44         OomdSystemContext system_context;
  45
  46         usec_t last_reclaim_at;
  47         usec_t post_action_delay_start;
  48
  49         sd_event_source *cgroup_context_event_source;
  50
  51         Varlink *varlink;
  52 };
  53
  54 Manager* manager_free(Manager *m);
  55 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
  56
  57 int manager_new(Manager **ret);
  58
  59 int manager_start(Manager *m, bool dry_run, int swap_used_limit_permyriad, int mem_pressure_limit_permyriad, usec_t mem_pressure_usec);
  60
  61 int manager_get_dump_string(Manager *m, char **ret);
  62
  63 CONFIG_PARSER_PROTOTYPE(config_parse_oomd_default);