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#include <stdio.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
const char* smaps_file = "smaps";
bool verbose = false;
int iterations = 1;
int bufsz = -1;
int64_t
get_pss(int pid)
{
char filename[64];
snprintf(filename, sizeof(filename), "/proc/%" PRId32 "/%s", pid,
smaps_file);
if (verbose)
fprintf(stderr, "smaps:[%s]\n", filename);
FILE * file = fopen(filename, "r");
if (!file) {
return (int64_t) -1;
}
if (bufsz >= 0) {
if (setvbuf(file, NULL, _IOFBF, bufsz)) {
fprintf(stderr, "setvbuf failed: %s\n", strerror(errno));
exit(1);
}
}
// Tally up all of the Pss from the various maps
char line[256];
int64_t pss = 0;
while (fgets(line, sizeof(line), file)) {
int64_t v;
if (sscanf(line, "Pss: %" SCNd64 " kB", &v) == 1) {
if (verbose)
fprintf(stderr, "pss line: %llu\n", (unsigned long long) v);
pss += v;
}
}
fclose(file);
// Return the Pss value in bytes, not kilobytes
return pss * 1024;
}
int
main(int argc, char** argv)
{
int c;
while ((c = getopt(argc, argv, "n:rvb:")) != -1) {
switch (c) {
case 'r':
smaps_file = "smaps_rollup";
break;
case 'v':
verbose = true;
break;
case 'n':
iterations = atoi(optarg);
break;
case 'b':
bufsz = atoi(optarg);
break;
default:
return 1;
}
}
if (argv[optind] == NULL) {
fprintf(stderr, "pssbench: no PID given\n");
return 1;
}
int pid = atoi(argv[optind]);
int64_t pss = 0;
for (int i = 0; i < iterations; ++i)
pss = get_pss(pid);
fflush(NULL);
printf("iterations:%d pid:%d pss:%lld\n", iterations, pid, (long long)pss);
return 0;
}
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