156 lines
3.5 KiB
C
156 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Test backward bit in event attribute, read ring buffer from end to
|
|
* beginning
|
|
*/
|
|
|
|
#include <perf.h>
|
|
#include <evlist.h>
|
|
#include <sys/prctl.h>
|
|
#include "tests.h"
|
|
#include "debug.h"
|
|
#include <errno.h>
|
|
|
|
#define NR_ITERS 111
|
|
|
|
static void testcase(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NR_ITERS; i++) {
|
|
char proc_name[15];
|
|
|
|
snprintf(proc_name, sizeof(proc_name), "p:%d\n", i);
|
|
prctl(PR_SET_NAME, proc_name);
|
|
}
|
|
}
|
|
|
|
static int count_samples(struct perf_evlist *evlist, int *sample_count,
|
|
int *comm_count)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < evlist->nr_mmaps; i++) {
|
|
struct perf_mmap *map = &evlist->overwrite_mmap[i];
|
|
union perf_event *event;
|
|
|
|
perf_mmap__read_init(map);
|
|
while ((event = perf_mmap__read_event(map)) != NULL) {
|
|
const u32 type = event->header.type;
|
|
|
|
switch (type) {
|
|
case PERF_RECORD_SAMPLE:
|
|
(*sample_count)++;
|
|
break;
|
|
case PERF_RECORD_COMM:
|
|
(*comm_count)++;
|
|
break;
|
|
default:
|
|
pr_err("Unexpected record of type %d\n", type);
|
|
return TEST_FAIL;
|
|
}
|
|
}
|
|
perf_mmap__read_done(map);
|
|
}
|
|
return TEST_OK;
|
|
}
|
|
|
|
static int do_test(struct perf_evlist *evlist, int mmap_pages,
|
|
int *sample_count, int *comm_count)
|
|
{
|
|
int err;
|
|
char sbuf[STRERR_BUFSIZE];
|
|
|
|
err = perf_evlist__mmap(evlist, mmap_pages);
|
|
if (err < 0) {
|
|
pr_debug("perf_evlist__mmap: %s\n",
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
|
return TEST_FAIL;
|
|
}
|
|
|
|
perf_evlist__enable(evlist);
|
|
testcase();
|
|
perf_evlist__disable(evlist);
|
|
|
|
err = count_samples(evlist, sample_count, comm_count);
|
|
perf_evlist__munmap(evlist);
|
|
return err;
|
|
}
|
|
|
|
|
|
int test__backward_ring_buffer(struct test *test __maybe_unused, int subtest __maybe_unused)
|
|
{
|
|
int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0;
|
|
char pid[16], sbuf[STRERR_BUFSIZE];
|
|
struct perf_evlist *evlist;
|
|
struct perf_evsel *evsel __maybe_unused;
|
|
struct parse_events_error parse_error;
|
|
struct record_opts opts = {
|
|
.target = {
|
|
.uid = UINT_MAX,
|
|
.uses_mmap = true,
|
|
},
|
|
.freq = 0,
|
|
.mmap_pages = 256,
|
|
.default_interval = 1,
|
|
};
|
|
|
|
snprintf(pid, sizeof(pid), "%d", getpid());
|
|
pid[sizeof(pid) - 1] = '\0';
|
|
opts.target.tid = opts.target.pid = pid;
|
|
|
|
evlist = perf_evlist__new();
|
|
if (!evlist) {
|
|
pr_debug("Not enough memory to create evlist\n");
|
|
return TEST_FAIL;
|
|
}
|
|
|
|
err = perf_evlist__create_maps(evlist, &opts.target);
|
|
if (err < 0) {
|
|
pr_debug("Not enough memory to create thread/cpu maps\n");
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
bzero(&parse_error, sizeof(parse_error));
|
|
/*
|
|
* Set backward bit, ring buffer should be writing from end. Record
|
|
* it in aux evlist
|
|
*/
|
|
err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error);
|
|
if (err) {
|
|
pr_debug("Failed to parse tracepoint event, try use root\n");
|
|
ret = TEST_SKIP;
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
perf_evlist__config(evlist, &opts, NULL);
|
|
|
|
err = perf_evlist__open(evlist);
|
|
if (err < 0) {
|
|
pr_debug("perf_evlist__open: %s\n",
|
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
ret = TEST_FAIL;
|
|
err = do_test(evlist, opts.mmap_pages, &sample_count,
|
|
&comm_count);
|
|
if (err != TEST_OK)
|
|
goto out_delete_evlist;
|
|
|
|
if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) {
|
|
pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n",
|
|
sample_count, comm_count);
|
|
goto out_delete_evlist;
|
|
}
|
|
|
|
err = do_test(evlist, 1, &sample_count, &comm_count);
|
|
if (err != TEST_OK)
|
|
goto out_delete_evlist;
|
|
|
|
ret = TEST_OK;
|
|
out_delete_evlist:
|
|
perf_evlist__delete(evlist);
|
|
return ret;
|
|
}
|