src/shared/psi-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 #include <stdbool.h>
   5
   6 #include "parse-util.h"
   7 #include "time-util.h"
   8
   9 typedef enum PressureType {
  10         PRESSURE_TYPE_SOME,
  11         PRESSURE_TYPE_FULL,
  12 } PressureType;
  13
  14 /* Averages are stored in fixed-point with 11 bit fractions */
  15 typedef struct ResourcePressure {
  16         loadavg_t avg10;
  17         loadavg_t avg60;
  18         loadavg_t avg300;
  19         usec_t total;
  20 } ResourcePressure;
  21
  22 /** Upstream 4.20+ format
  23  *
  24  *  some avg10=0.22 avg60=0.17 avg300=1.11 total=58761459
  25  *  full avg10=0.23 avg60=0.16 avg300=1.08 total=58464525
  26  */
  27 int read_resource_pressure(const char *path, PressureType type, ResourcePressure *ret);
  28
  29 /* Was the kernel compiled with CONFIG_PSI=y? 1 if yes, 0 if not, negative on error. */
  30 int is_pressure_supported(void);