/*
 * 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"

#define NR_ITERS 111

static void testcase(void)
{
	int i;

	for (i = 0; i < NR_ITERS; i++) {
		char proc_name[10];

		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++) {
		union perf_event *event;

		perf_mmap__read_catchup(&evlist->backward_mmap[i]);
		while ((event = perf_mmap__read_backward(&evlist->backward_mmap[i])) != 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;
			}
		}
	}
	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, true);
	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(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;
}
nd/soc/codecs/wm5110.h?h=nds-private-remove&amp;id=108d9c71dcff8fc2523861b3462ab2ba8a754ed9'>wm5110.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/codecs/wm5110.h?h=nds-private-remove&amp;id=108d9c71dcff8fc2523861b3462ab2ba8a754ed9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
d class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-08 09:56:15 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-08 09:56:15 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/sched?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/sched?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>4aff32d5f2f6fe2f54028bfd4d1b66fdd2f8d281</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/sched?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>net/sched</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/sched?id=926af6273fc683cd98cd0ce7bf0d04a02eed6742'>926af6273fc683cd98cd0ce7bf0d04a02eed6742</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/sched?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b&amp;id2=926af6273fc683cd98cd0ce7bf0d04a02eed6742'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/sched?id=eeeefd41843218c55a8782a6920f044d9bf6207a'>eeeefd41843218c55a8782a6920f044d9bf6207a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/sched?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b&amp;id2=eeeefd41843218c55a8782a6920f044d9bf6207a'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'for-linus' of git://git.kernel.dk/linux-block</div><div class='commit-msg'>Pull block fix from Jens Axboe:
 "A single fix that should go into 4.10, fixing a regression on some
  devices with the WRITE_SAME command"

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: don't try Write Same from __blkdev_issue_zeroout
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>Diffstat</a> (limited to 'net/sched')</div><table summary='diffstat' class='diffstat'>