58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "basic-forward.h"
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#include "parse-util.h"
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typedef enum PressureType {
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PRESSURE_TYPE_SOME,
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PRESSURE_TYPE_FULL,
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} PressureType;
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typedef enum PressureResource {
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PRESSURE_MEMORY,
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PRESSURE_CPU,
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PRESSURE_IO,
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_PRESSURE_RESOURCE_MAX,
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_PRESSURE_RESOURCE_INVALID = -EINVAL,
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} PressureResource;
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/* Averages are stored in fixed-point with 11 bit fractions */
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typedef struct ResourcePressure {
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loadavg_t avg10;
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loadavg_t avg60;
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loadavg_t avg300;
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usec_t total;
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} ResourcePressure;
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/** Upstream 4.20+ format
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*
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* some avg10=0.22 avg60=0.17 avg300=1.11 total=58761459
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* full avg10=0.23 avg60=0.16 avg300=1.08 total=58464525
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*/
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int read_resource_pressure(const char *path, PressureType type, ResourcePressure *ret);
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/* Was the kernel compiled with CONFIG_PSI=y? 1 if yes, 0 if not, negative on error. */
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int is_pressure_supported(void);
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/* Metadata for each pressure resource type, for use in sd-event and PID 1 */
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typedef struct PressureResourceInfo {
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const char *name; /* "memory", "cpu", "io" */
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const char *env_watch; /* "MEMORY_PRESSURE_WATCH", etc. */
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const char *env_write; /* "MEMORY_PRESSURE_WRITE", etc. */
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} PressureResourceInfo;
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extern const PressureResourceInfo pressure_resource_info[_PRESSURE_RESOURCE_MAX];
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static inline const PressureResourceInfo* pressure_resource_get_info(PressureResource resource) {
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assert(resource >= 0 && resource < _PRESSURE_RESOURCE_MAX);
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return &pressure_resource_info[resource];
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}
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DECLARE_STRING_TABLE_LOOKUP(pressure_resource, PressureResource);
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/* Default parameters for pressure watch logic in sd-event and PID 1 */
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#define PRESSURE_DEFAULT_TYPE "some"
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#define PRESSURE_DEFAULT_THRESHOLD_USEC (200 * USEC_PER_MSEC)
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#define PRESSURE_DEFAULT_WINDOW_USEC (2 * USEC_PER_SEC)
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