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prof: add user/kernel statistics

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Matheus
2026-04-22 19:44:08 -03:00
parent 337c2e6b69
commit 90a420d8bb
3 changed files with 49 additions and 20 deletions
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tools/prof/main.c
+18 -6
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@@ -22,8 +22,8 @@ static int open_or_die(const char *name, int flag, mode_t mode) {
int main(int argc, char *argv[]) {
progname = argv[0];
if (argc != 2) {
fprintf(stderr, "%s: usage: %s FILE\n", argv[0], argv[0]);
if (argc < 2 || argc > 3) {
fprintf(stderr, "%s: usage: %s FILE [-n]\n", argv[0], argv[0]);
return EXIT_FAILURE;
}
@@ -42,10 +42,12 @@ int main(int argc, char *argv[]) {
tcsetattr(outfd, TCSANOW, &termios);
}
printf("%s: draining /dev/prof\n", argv[0]);
// empty it
if (ioctl(infd, 12345678, NULL) < 0)
return EXIT_FAILURE;
if (argc == 2 || (strcmp(argv[1], "-n") && strcmp(argv[2], "-n"))) {
printf("%s: draining /dev/prof\n", argv[0]);
// empty it
if (ioctl(infd, 12345678, NULL) < 0)
return EXIT_FAILURE;
}
struct pollfd pollfd[2];
@@ -68,6 +70,16 @@ int main(int argc, char *argv[]) {
write(outfd, buf, 8 * count);
}
size_t hits[2];
ioctl(infd, 87654321, hits);
size_t total = hits[0] + hits[1];
float u_ratio = (float)hits[0] / (float)total;
float k_ratio = 1.f - u_ratio;
printf("%s: %lu hits\n", argv[0], total);
printf("%s: %lu userspace hits (%01.02f%%)\n", argv[0], hits[0], u_ratio * 100);
printf("%s: %lu kernel hits (%01.02f%%)\n", argv[0], hits[1], k_ratio * 100);
printf("%s: done\n", argv[0]);
return EXIT_SUCCESS;