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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "scrape.h"
#include "util.h"
// size of input buffer for paths and lines
#define BUF_SIZE 256
static void vmstat_collect(scrape_req *req, void *ctx);
const struct collector vmstat_collector = {
.name = "vmstat",
.collect = vmstat_collect,
};
static const struct {
const char *name;
const char *key;
unsigned key_len;
} metrics[] = {
{ .name = "node_vmstat_oom_kill", .key = "oom_kill ", .key_len = 9 },
{ .name = "node_vmstat_pgfault", .key = "pgfault ", .key_len = 8 },
{ .name = "node_vmstat_pgmajfault", .key = "pgmajfault ", .key_len = 11 },
{ .name = "node_vmstat_pgpgin", .key = "pgpgin ", .key_len = 7 },
{ .name = "node_vmstat_pgpgout", .key = "pgpgout ", .key_len = 8 },
{ .name = "node_vmstat_pswpin", .key = "pswpin ", .key_len = 7 },
{ .name = "node_vmstat_pswpout", .key = "pswpout ", .key_len = 8 },
};
#define NMETRICS (sizeof metrics / sizeof *metrics)
static void vmstat_collect(scrape_req *req, void *ctx) {
(void) ctx;
// buffers
char buf[BUF_SIZE];
FILE *f;
// scan /proc/stat for metrics
f = fopen(PATH("/proc/vmstat"), "r");
if (!f)
return;
while (fgets_line(buf, sizeof buf, f)) {
for (size_t m = 0; m < NMETRICS; m++) {
if (strncmp(buf, metrics[m].key, metrics[m].key_len) != 0)
continue;
char *end;
double d = strtod(buf + metrics[m].key_len, &end);
if (*end != '\0' && *end != ' ' && *end != '\n')
continue;
scrape_write(req, metrics[m].name, 0, d);
break;
}
}
fclose(f);
}
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