|
/* retoor <retoor@molodetz.nl> */
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "memory.h"
|
|
|
|
int memory_info_init(MemoryInfo *info) {
|
|
if (!info) return -1;
|
|
memset(info, 0, sizeof(MemoryInfo));
|
|
return memory_info_update(info, 0);
|
|
}
|
|
|
|
int memory_info_update(MemoryInfo *info, double interval) {
|
|
if (!info) return -1;
|
|
|
|
info->prev_page_faults = info->page_faults;
|
|
info->prev_page_in = info->page_in;
|
|
info->prev_page_out = info->page_out;
|
|
|
|
FILE *fp = fopen("/proc/meminfo", "r");
|
|
if (!fp) return -1;
|
|
|
|
char line[256];
|
|
unsigned long mem_total = 0, mem_free = 0, mem_available = 0;
|
|
unsigned long buffers = 0, cached = 0, slab_reclaimable = 0;
|
|
unsigned long swap_total = 0, swap_free = 0;
|
|
|
|
while (fgets(line, sizeof(line), fp)) {
|
|
if (strncmp(line, "MemTotal:", 9) == 0) {
|
|
sscanf(line + 9, "%lu", &mem_total);
|
|
} else if (strncmp(line, "MemFree:", 8) == 0) {
|
|
sscanf(line + 8, "%lu", &mem_free);
|
|
} else if (strncmp(line, "MemAvailable:", 13) == 0) {
|
|
sscanf(line + 13, "%lu", &mem_available);
|
|
} else if (strncmp(line, "Buffers:", 8) == 0) {
|
|
sscanf(line + 8, "%lu", &buffers);
|
|
} else if (strncmp(line, "Cached:", 7) == 0) {
|
|
sscanf(line + 7, "%lu", &cached);
|
|
} else if (strncmp(line, "SReclaimable:", 13) == 0) {
|
|
sscanf(line + 13, "%lu", &slab_reclaimable);
|
|
} else if (strncmp(line, "SwapTotal:", 10) == 0) {
|
|
sscanf(line + 10, "%lu", &swap_total);
|
|
} else if (strncmp(line, "SwapFree:", 9) == 0) {
|
|
sscanf(line + 9, "%lu", &swap_free);
|
|
}
|
|
}
|
|
fclose(fp);
|
|
|
|
info->total = mem_total;
|
|
info->free = mem_free;
|
|
info->available = mem_available;
|
|
info->buffers = buffers;
|
|
info->cached = cached + slab_reclaimable;
|
|
info->used = mem_total - mem_available;
|
|
|
|
if (mem_total > 0) {
|
|
info->used_percent = 100.0 * (double)info->used / (double)mem_total;
|
|
}
|
|
|
|
info->swap_total = swap_total;
|
|
info->swap_free = swap_free;
|
|
info->swap_used = swap_total - swap_free;
|
|
|
|
if (swap_total > 0) {
|
|
info->swap_percent = 100.0 * (double)info->swap_used / (double)swap_total;
|
|
}
|
|
|
|
fp = fopen("/proc/vmstat", "r");
|
|
if (fp) {
|
|
while (fgets(line, sizeof(line), fp)) {
|
|
if (strncmp(line, "pgfault ", 8) == 0) {
|
|
sscanf(line + 8, "%lu", &info->page_faults);
|
|
} else if (strncmp(line, "pgpgin ", 7) == 0) {
|
|
sscanf(line + 7, "%lu", &info->page_in);
|
|
} else if (strncmp(line, "pgpgout ", 8) == 0) {
|
|
sscanf(line + 8, "%lu", &info->page_out);
|
|
}
|
|
}
|
|
fclose(fp);
|
|
}
|
|
|
|
if (interval > 0) {
|
|
info->page_faults_per_sec = (double)(info->page_faults - info->prev_page_faults) / interval;
|
|
info->page_in_per_sec = (double)(info->page_in - info->prev_page_in) / interval;
|
|
info->page_out_per_sec = (double)(info->page_out - info->prev_page_out) / interval;
|
|
}
|
|
|
|
return 0;
|
|
}
|