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a617007417
This changes the PSI window duration we default to for watching memory pressure events from 1s to 2s. This is because apparently the kernel will soon disallow window durations other than 2s for unprivileged processes. Hence, we'll bump the threshold from 100m to 200ms, and the window from 1s to 2s.
36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <stdbool.h>
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#include "parse-util.h"
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#include "time-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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/* 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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/* Default parameters for memory pressure watch logic in sd-event and PID 1 */
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#define MEMORY_PRESSURE_DEFAULT_TYPE "some"
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#define MEMORY_PRESSURE_DEFAULT_THRESHOLD_USEC (200 * USEC_PER_MSEC)
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#define MEMORY_PRESSURE_DEFAULT_WINDOW_USEC (2 * USEC_PER_SEC)
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