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// SPDX-License-Identifier: GPL-3.0-or-later
#include "plugin_proc.h"
#define PLUGIN_PROC_MODULE_PRESSURE_NAME "/proc/pressure"
#define CONFIG_SECTION_PLUGIN_PROC_PRESSURE "plugin:" PLUGIN_PROC_CONFIG_NAME ":" PLUGIN_PROC_MODULE_PRESSURE_NAME
// linux calculates this every 2 seconds, see kernel/sched/psi.c PSI_FREQ
#define MIN_PRESSURE_UPDATE_EVERY 2
static struct pressure resources[PRESSURE_NUM_RESOURCES] = {
{
.some = { .id = "cpu_pressure", .title = "CPU Pressure" },
},
{
.some = { .id = "memory_some_pressure", .title = "Memory Pressure" },
.full = { .id = "memory_full_pressure", .title = "Memory Full Pressure" },
},
{
.some = { .id = "io_some_pressure", .title = "I/O Pressure" },
.full = { .id = "io_full_pressure", .title = "I/O Full Pressure" },
},
};
static struct {
procfile *pf;
const char *name; // metric file name
const char *family; // webui section name
int section_priority;
} resource_info[PRESSURE_NUM_RESOURCES] = {
{ .name = "cpu", .family = "cpu", .section_priority = NETDATA_CHART_PRIO_SYSTEM_CPU },
{ .name = "memory", .family = "ram", .section_priority = NETDATA_CHART_PRIO_SYSTEM_RAM },
{ .name = "io", .family = "disk", .section_priority = NETDATA_CHART_PRIO_SYSTEM_IO },
};
void update_pressure_chart(struct pressure_chart *chart) {
rrddim_set_by_pointer(chart->st, chart->rd10, (collected_number)(chart->value10 * 100));
rrddim_set_by_pointer(chart->st, chart->rd60, (collected_number) (chart->value60 * 100));
rrddim_set_by_pointer(chart->st, chart->rd300, (collected_number) (chart->value300 * 100));
rrdset_done(chart->st);
}
int do_proc_pressure(int update_every, usec_t dt) {
int fail_count = 0;
int i;
static usec_t next_pressure_dt = 0;
static char *base_path = NULL;
update_every = (update_every < MIN_PRESSURE_UPDATE_EVERY) ? MIN_PRESSURE_UPDATE_EVERY : update_every;
if (next_pressure_dt <= dt) {
next_pressure_dt = update_every * USEC_PER_SEC;
} else {
next_pressure_dt -= dt;
return 0;
}
if (unlikely(!base_path)) {
base_path = config_get(CONFIG_SECTION_PLUGIN_PROC_PRESSURE, "base path of pressure metrics", "/proc/pressure");
}
for (i = 0; i < PRESSURE_NUM_RESOURCES; i++) {
procfile *ff = resource_info[i].pf;
int do_some = resources[i].some.enabled, do_full = resources[i].full.enabled;
if (unlikely(!ff)) {
char filename[FILENAME_MAX + 1];
char config_key[CONFIG_MAX_NAME + 1];
snprintfz(filename
, FILENAME_MAX
, "%s%s/%s"
, netdata_configured_host_prefix
, base_path
, resource_info[i].name);
snprintfz(config_key, CONFIG_MAX_NAME, "enable %s some pressure", resource_info[i].name);
do_some = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_PRESSURE, config_key, CONFIG_BOOLEAN_YES);
resources[i].some.enabled = do_some;
if (resources[i].full.id) {
snprintfz(config_key, CONFIG_MAX_NAME, "enable %s full pressure", resource_info[i].name);
do_full = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_PRESSURE, config_key, CONFIG_BOOLEAN_YES);
resources[i].full.enabled = do_full;
}
ff = procfile_open(filename, " =", PROCFILE_FLAG_DEFAULT);
if (unlikely(!ff)) {
error("Cannot read pressure information from %s.", filename);
fail_count++;
continue;
}
}
ff = procfile_readall(ff);
resource_info[i].pf = ff;
if (unlikely(!ff)) {
fail_count++;
continue;
}
size_t lines = procfile_lines(ff);
if (unlikely(lines < 1)) {
error("%s has no lines.", procfile_filename(ff));
fail_count++;
continue;
}
struct pressure_chart *chart;
if (do_some) {
chart = &resources[i].some;
if (unlikely(!chart->st)) {
chart->st = rrdset_create_localhost(
"system"
, chart->id
, NULL
, resource_info[i].family
, NULL
, chart->title
, "percentage"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_PRESSURE_NAME
, resource_info[i].section_priority + 40
, update_every
, RRDSET_TYPE_LINE
);
chart->rd10 = rrddim_add(chart->st, "some 10", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE);
chart->rd60 = rrddim_add(chart->st, "some 60", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE);
chart->rd300 = rrddim_add(chart->st, "some 300", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE);
} else {
rrdset_next(chart->st);
}
chart->value10 = strtod(procfile_lineword(ff, 0, 2), NULL);
chart->value60 = strtod(procfile_lineword(ff, 0, 4), NULL);
chart->value300 = strtod(procfile_lineword(ff, 0, 6), NULL);
update_pressure_chart(chart);
}
if (do_full && lines > 2) {
chart = &resources[i].full;
if (unlikely(!chart->st)) {
chart->st = rrdset_create_localhost(
"system"
, chart->id
, NULL
, resource_info[i].family
, NULL
, chart->title
, "percentage"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_PRESSURE_NAME
, resource_info[i].section_priority + 45
, update_every
, RRDSET_TYPE_LINE
);
chart->rd10 = rrddim_add(chart->st, "full 10", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE);
chart->rd60 = rrddim_add(chart->st, "full 60", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE);
chart->rd300 = rrddim_add(chart->st, "full 300", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE);
} else {
rrdset_next(chart->st);
}
chart->value10 = strtod(procfile_lineword(ff, 1, 2), NULL);
chart->value60 = strtod(procfile_lineword(ff, 1, 4), NULL);
chart->value300 = strtod(procfile_lineword(ff, 1, 6), NULL);
update_pressure_chart(chart);
}
}
if (PRESSURE_NUM_RESOURCES == fail_count) {
return 1;
}
return 0;
}
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