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instruments/poller: add ftrace marker support

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- Add an option to the poller binary insert a marker into ftrace that
  aligns with the first output entry. The option is exposed as an
  instrument parameter.
- If this parameter is set, the resulting .csv will be post-processed to
  update the timestamps to align with trace-cmd output.
- Change poller artifact names to use - instead of _ to be consistent
  with trace-cmd artifact naming.
This commit is contained in:
Sergei Trofimov
2018-01-25 08:22:21 +00:00
committed by Marc Bonnici
parent 1fe899fd7c
commit 902c3c6ace
4 changed files with 90 additions and 17 deletions
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45
wa/instruments/poller/poller.c
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@@ -1,7 +1,7 @@
#include <fcntl.h>
#include <stdio.h>
#include <sys/poll.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
@@ -31,6 +31,23 @@ typedef struct {
char *path;
} poll_source_t;
int write_trace_marker(char *marker, int size)
{
int ret;
FILE *file;
file = fopen("/sys/kernel/debug/tracing/trace_marker", "w");
if (file == NULL) {
return -errno;
}
ret = fwrite(marker, sizeof(char), size, file);
fclose(file);
return ret;
}
int main(int argc, char ** argv) {
extern char *optarg;
@@ -40,16 +57,21 @@ int main(int argc, char ** argv) {
useconds_t interval = 1000000;
char buf[1024];
memset(buf, 0, sizeof(buf));
struct timeval current_time;
struct timespec current_time;
double time_float;
char *labels;
int labelCount = 0;
int should_write_marker = 0;
int ret;
static char usage[] = "usage: %s [-h] [-t INTERVAL] FILE [FILE ...]\n"
static char usage[] = "usage: %s [-h] [-m] [-t INTERVAL] FILE [FILE ...]\n"
"polls FILE(s) every INTERVAL microseconds and outputs\n"
"the results in CSV format including a timestamp to STDOUT\n"
"\n"
" -h Display this message\n"
" -m Insert a marker into ftrace at the time of the first\n"
" sample. This marker may be used to align the timestamps\n"
" produced by the poller with those of ftrace events.\n"
" -t The polling sample interval in microseconds\n"
" Defaults to 1000000 (1 second)\n"
" -l Comma separated list of labels to use in the CSV\n"
@@ -57,7 +79,7 @@ int main(int argc, char ** argv) {
//Handling command line arguments
while ((c = getopt(argc, argv, "ht:l:")) != -1)
while ((c = getopt(argc, argv, "hmt:l:")) != -1)
{
switch(c) {
case 'h':
@@ -65,6 +87,9 @@ int main(int argc, char ** argv) {
default:
show_help = 1;
break;
case 'm':
should_write_marker = 1;
break;
case 't':
interval = (useconds_t)atoi(optarg);
break;
@@ -131,9 +156,17 @@ int main(int argc, char ** argv) {
//Poll files
int bytes_read = 0;
while (!done) {
gettimeofday(&current_time, NULL);
clock_gettime(CLOCK_BOOTTIME, &current_time);
if (should_write_marker) {
ret = write_trace_marker("POLLER_START", 12);
if (ret < 0) {
fprintf(stderr, "ERROR writing trace marker: %s\n", strerror(ret));
exit(ret);
}
}
time_float = (double)current_time.tv_sec;
time_float += ((double)current_time.tv_usec)/1000/1000;
time_float += ((double)current_time.tv_nsec)/1000/1000/1000;
printf("%f", time_float);
for (i = 0; i < num_files; i++) {
lseek(files_to_poll[i].fd, 0, SEEK_SET);