113 lines
4.6 KiB
C
113 lines
4.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
#pragma once
|
|
|
|
#include <stdbool.h>
|
|
|
|
#include "hashmap.h"
|
|
#include "psi-util.h"
|
|
|
|
#define GROWING_SIZE_PERCENTILE 80
|
|
|
|
extern const struct hash_ops oomd_cgroup_ctx_hash_ops;
|
|
|
|
typedef struct OomdCGroupContext OomdCGroupContext;
|
|
typedef struct OomdSystemContext OomdSystemContext;
|
|
|
|
typedef int (oomd_compare_t)(OomdCGroupContext * const *, OomdCGroupContext * const *);
|
|
|
|
struct OomdCGroupContext {
|
|
char *path;
|
|
|
|
ResourcePressure memory_pressure;
|
|
|
|
uint64_t current_memory_usage;
|
|
|
|
uint64_t memory_min;
|
|
uint64_t memory_low;
|
|
uint64_t swap_usage;
|
|
|
|
uint64_t last_pgscan;
|
|
uint64_t pgscan;
|
|
|
|
/* These are only used by oomd_pressure_above for acting on high memory pressure. */
|
|
loadavg_t mem_pressure_limit;
|
|
usec_t last_hit_mem_pressure_limit;
|
|
};
|
|
|
|
struct OomdSystemContext {
|
|
uint64_t swap_total;
|
|
uint64_t swap_used;
|
|
};
|
|
|
|
OomdCGroupContext *oomd_cgroup_context_free(OomdCGroupContext *ctx);
|
|
DEFINE_TRIVIAL_CLEANUP_FUNC(OomdCGroupContext*, oomd_cgroup_context_free);
|
|
|
|
/* All hashmaps used with these functions are expected to be of the form
|
|
* key: cgroup paths -> value: OomdCGroupContext. */
|
|
|
|
/* Scans all the OomdCGroupContexts in `h` and returns 1 and a set of pointers to those OomdCGroupContexts in `ret`
|
|
* if any of them have exceeded their supplied memory pressure limits for the `duration` length of time.
|
|
* `last_hit_mem_pressure_limit` is updated accordingly for each entry when the limit is exceeded, and when it returns
|
|
* below the limit.
|
|
* Returns 0 and sets `ret` to an empty set if no entries exceeded limits for `duration`.
|
|
* Returns -ENOMEM for allocation errors. */
|
|
int oomd_pressure_above(Hashmap *h, usec_t duration, Set **ret);
|
|
|
|
/* Sum up current OomdCGroupContexts' pgscan values and last interval's pgscan values in `h`. Returns true if the
|
|
* current sum is higher than the last interval's sum (there was some reclaim activity). */
|
|
bool oomd_memory_reclaim(Hashmap *h);
|
|
|
|
/* Returns true if the amount of swap free is below the percentage of swap specified by `threshold_percent`. */
|
|
bool oomd_swap_free_below(const OomdSystemContext *ctx, uint64_t threshold_percent);
|
|
|
|
static inline int compare_pgscan(OomdCGroupContext * const *c1, OomdCGroupContext * const *c2) {
|
|
assert(c1);
|
|
assert(c2);
|
|
|
|
if ((*c1)->pgscan > (*c2)->pgscan)
|
|
return -1;
|
|
else if ((*c1)->pgscan < (*c2)->pgscan)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int compare_swap_usage(OomdCGroupContext * const *c1, OomdCGroupContext * const *c2) {
|
|
assert(c1);
|
|
assert(c2);
|
|
|
|
if ((*c1)->swap_usage > (*c2)->swap_usage)
|
|
return -1;
|
|
else if ((*c1)->swap_usage < (*c2)->swap_usage)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Get an array of OomdCGroupContexts from `h`, qsorted from largest to smallest values according to `compare_func`.
|
|
* If `prefix` is not NULL, only include OomdCGroupContexts whose paths start with prefix. Otherwise all paths are sorted.
|
|
* Returns the number of sorted items; negative on error. */
|
|
int oomd_sort_cgroup_contexts(Hashmap *h, oomd_compare_t compare_func, const char *prefix, OomdCGroupContext ***ret);
|
|
|
|
/* Returns a negative value on error, 0 if no processes were killed, or 1 if processes were killed. */
|
|
int oomd_cgroup_kill(const char *path, bool recurse, bool dry_run);
|
|
|
|
/* The following oomd_kill_by_* functions return 1 if processes were killed, or negative otherwise. */
|
|
/* If `prefix` is supplied, only cgroups whose paths start with `prefix` are eligible candidates. Otherwise,
|
|
* everything in `h` is a candidate. */
|
|
int oomd_kill_by_pgscan(Hashmap *h, const char *prefix, bool dry_run);
|
|
int oomd_kill_by_swap_usage(Hashmap *h, bool dry_run);
|
|
|
|
int oomd_cgroup_context_acquire(const char *path, OomdCGroupContext **ret);
|
|
int oomd_system_context_acquire(const char *proc_swaps_path, OomdSystemContext *ret);
|
|
|
|
/* Get the OomdCGroupContext of `path` and insert it into `new_h`. The key for the inserted context will be `path`.
|
|
*
|
|
* `old_h` is used to get data used to calculate prior interval information. `old_h` can be NULL in which case there
|
|
* was no prior data to reference. */
|
|
int oomd_insert_cgroup_context(Hashmap *old_h, Hashmap *new_h, const char *path);
|
|
|
|
void oomd_dump_swap_cgroup_context(const OomdCGroupContext *ctx, FILE *f, const char *prefix);
|
|
void oomd_dump_memory_pressure_cgroup_context(const OomdCGroupContext *ctx, FILE *f, const char *prefix);
|
|
void oomd_dump_system_context(const OomdSystemContext *ctx, FILE *f, const char *prefix);
|