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