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libdrgn: add option to time load_debug_info example program

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I often use examples/load_debug_info to benchmark loading/DWARF
indexing, so add a -T option that prints the time it takes to load debug
info.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
This commit is contained in:
Omar Sandoval 2021-04-23 09:28:26 -07:00
parent 2d40d6e146
commit 2ad52cb5f4
1 changed files with 33 additions and 1 deletions
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34
libdrgn/examples/load_debug_info.c
View File

@ -1,10 +1,27 @@
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "drgn.h"
static inline struct timespec timespec_sub(struct timespec a, struct timespec b)
{
if (a.tv_nsec < b.tv_nsec) {
return (struct timespec){
.tv_sec = a.tv_sec - 1 - b.tv_sec,
.tv_nsec = a.tv_nsec + 1000000000L - b.tv_nsec,
};
} else {
return (struct timespec){
.tv_sec = a.tv_sec - b.tv_sec,
.tv_nsec = a.tv_nsec - b.tv_nsec,
};
}
}
static void usage(bool error)
{
fprintf(error ? stderr : stdout,
@ -16,6 +33,7 @@ static void usage(bool error)
" -k, --kernel debug the running kernel (default)\n"
" -c PATH, --core PATH debug the given core dump\n"
" -p PID, --pid PID debug the running process with the given PID\n"
" -T, --time print how long loading debug info took in seconds\n"
" -h, --help display this help message and exit\n");
exit(error ? EXIT_FAILURE : EXIT_SUCCESS);
}
@ -26,14 +44,16 @@ int main(int argc, char **argv)
{"kernel", no_argument, NULL, 'k'},
{"core", required_argument, NULL, 'c'},
{"pid", required_argument, NULL, 'p'},
{"time", no_argument, NULL, 'T'},
{"help", no_argument, NULL, 'h'},
{},
};
bool kernel = false;
const char *core = NULL;
const char *pid = NULL;
bool print_time = false;
for (;;) {
int c = getopt_long(argc, argv, "kc:p:h", long_options, NULL);
int c = getopt_long(argc, argv, "kc:p:Th", long_options, NULL);
if (c == -1)
break;
switch (c) {
@ -46,6 +66,9 @@ int main(int argc, char **argv)
case 'p':
pid = optarg;
break;
case 'T':
print_time = true;
break;
case 'h':
usage(false);
default:
@ -71,7 +94,16 @@ int main(int argc, char **argv)
if (err)
goto out;
struct timespec start, end;
if (print_time && clock_gettime(CLOCK_MONOTONIC, &start))
abort();
err = drgn_program_load_debug_info(prog, NULL, 0, true, true);
if ((!err || err->code == DRGN_ERROR_MISSING_DEBUG_INFO) && print_time) {
if (clock_gettime(CLOCK_MONOTONIC, &end))
abort();
struct timespec diff = timespec_sub(end, start);
printf("%lld.%09ld\n", (long long)diff.tv_sec, diff.tv_nsec);
}
out:;
int status;