#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <poll.h>
#include <sys/ioctl.h>
#include <linux/perf_event.h>
#include <linux/bpf.h>
#include "libbpf.h"
#include "bpf_load.h"
#include "perf-sys.h"

#define SAMPLE_PERIOD  0x7fffffffffffffffULL

static void test_bpf_perf_event(void)
{
	int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
	int *pmu_fd = malloc(nr_cpus * sizeof(int));
	int status, i;

	struct perf_event_attr attr_insn_pmu = {
		.freq = 0,
		.sample_period = SAMPLE_PERIOD,
		.inherit = 0,
		.type = PERF_TYPE_HARDWARE,
		.read_format = 0,
		.sample_type = 0,
		.config = 0,/* PMU: cycles */
	};

	for (i = 0; i < nr_cpus; i++) {
		pmu_fd[i] = sys_perf_event_open(&attr_insn_pmu, -1/*pid*/, i/*cpu*/, -1/*group_fd*/, 0);
		if (pmu_fd[i] < 0) {
			printf("event syscall failed\n");
			goto exit;
		}

		bpf_map_update_elem(map_fd[0], &i, &pmu_fd[i], BPF_ANY);
		ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0);
	}

	status = system("ls > /dev/null");
	if (status)
		goto exit;
	status = system("sleep 2");
	if (status)
		goto exit;

exit:
	for (i = 0; i < nr_cpus; i++)
		close(pmu_fd[i]);
	close(map_fd[0]);
	free(pmu_fd);
}

int main(int argc, char **argv)
{
	char filename[256];

	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

	if (load_bpf_file(filename)) {
		printf("%s", bpf_log_buf);
		return 1;
	}

	test_bpf_perf_event();
	read_trace_pipe();

	return 0;
}
<td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=5906374446386fd16fe562b042429d905d231ec3'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=5906374446386fd16fe562b042429d905d231ec3'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/core?id=5906374446386fd16fe562b042429d905d231ec3'>core</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/core/drop_monitor.c?id=5906374446386fd16fe562b042429d905d231ec3'>drop_monitor.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='5906374446386fd16fe562b042429d905d231ec3'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td 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'>2017-01-27 12:41:46 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-27 12:41:46 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/core/drop_monitor.c?id=5906374446386fd16fe562b042429d905d231ec3'>5906374446386fd16fe562b042429d905d231ec3</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/core/drop_monitor.c?id=5906374446386fd16fe562b042429d905d231ec3'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=5906374446386fd16fe562b042429d905d231ec3'>8e8a9f367d1aeba25c644d3fcf096ffc443c4c5a</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/core/drop_monitor.c?id=5906374446386fd16fe562b042429d905d231ec3'>net/core/drop_monitor.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/core/drop_monitor.c?id=2fb78e89405f4321b86274a0c24b30896dd50529'>2fb78e89405f4321b86274a0c24b30896dd50529</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/core/drop_monitor.c?id=5906374446386fd16fe562b042429d905d231ec3&amp;id2=2fb78e89405f4321b86274a0c24b30896dd50529'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/core/drop_monitor.c?id=57b59ed2e5b91e958843609c7884794e29e6c4cb'>57b59ed2e5b91e958843609c7884794e29e6c4cb</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/core/drop_monitor.c?id=5906374446386fd16fe562b042429d905d231ec3&amp;id2=57b59ed2e5b91e958843609c7884794e29e6c4cb'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs</div><div class='commit-msg'>Pull btrfs updates from Chris Mason:
 "Some fixes that we've collected from the list.

  We still have one more pending to nail down a regression in lzo
  compression, but I wanted to get this batch out the door"

* 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: remove -&gt;{get, set}_acl() from btrfs_dir_ro_inode_operations
  Btrfs: disable xattr operations on subvolume directories
  Btrfs: remove old tree_root case in btrfs_read_locked_inode()
  Btrfs: fix truncate down when no_holes feature is enabled
  Btrfs: Fix deadlock between direct IO and fast fsync
  btrfs: fix false enospc error when truncating heavily reflinked file
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=5906374446386fd16fe562b042429d905d231ec3'>Diffstat</a> (limited to 'net/core/drop_monitor.c')</div><table summary='diffstat' class='diffstat'>