/* Copyright (c) 2016 Facebook
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#define _GNU_SOURCE
#include <sched.h>
#include <stdio.h>
#include <sys/types.h>
#include <asm/unistd.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <signal.h>
#include <linux/bpf.h>
#include <string.h>
#include <time.h>
#include <sys/resource.h>
#include "libbpf.h"
#include "bpf_load.h"

#define MAX_CNT 1000000

static __u64 time_get_ns(void)
{
	struct timespec ts;

	clock_gettime(CLOCK_MONOTONIC, &ts);
	return ts.tv_sec * 1000000000ull + ts.tv_nsec;
}

static void test_task_rename(int cpu)
{
	__u64 start_time;
	char buf[] = "test\n";
	int i, fd;

	fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
	if (fd < 0) {
		printf("couldn't open /proc\n");
		exit(1);
	}
	start_time = time_get_ns();
	for (i = 0; i < MAX_CNT; i++)
		write(fd, buf, sizeof(buf));
	printf("task_rename:%d: %lld events per sec\n",
	       cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
	close(fd);
}

static void test_urandom_read(int cpu)
{
	__u64 start_time;
	char buf[4];
	int i, fd;

	fd = open("/dev/urandom", O_RDONLY);
	if (fd < 0) {
		printf("couldn't open /dev/urandom\n");
		exit(1);
	}
	start_time = time_get_ns();
	for (i = 0; i < MAX_CNT; i++)
		read(fd, buf, sizeof(buf));
	printf("urandom_read:%d: %lld events per sec\n",
	       cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
	close(fd);
}

static void loop(int cpu, int flags)
{
	cpu_set_t cpuset;

	CPU_ZERO(&cpuset);
	CPU_SET(cpu, &cpuset);
	sched_setaffinity(0, sizeof(cpuset), &cpuset);

	if (flags & 1)
		test_task_rename(cpu);
	if (flags & 2)
		test_urandom_read(cpu);
}

static void run_perf_test(int tasks, int flags)
{
	pid_t pid[tasks];
	int i;

	for (i = 0; i < tasks; i++) {
		pid[i] = fork();
		if (pid[i] == 0) {
			loop(i, flags);
			exit(0);
		} else if (pid[i] == -1) {
			printf("couldn't spawn #%d process\n", i);
			exit(1);
		}
	}
	for (i = 0; i < tasks; i++) {
		int status;

		assert(waitpid(pid[i], &status, 0) == pid[i]);
		assert(status == 0);
	}
}

static void unload_progs(void)
{
	close(prog_fd[0]);
	close(prog_fd[1]);
	close(event_fd[0]);
	close(event_fd[1]);
}

int main(int argc, char **argv)
{
	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
	char filename[256];
	int num_cpu = 8;
	int test_flags = ~0;

	setrlimit(RLIMIT_MEMLOCK, &r);

	if (argc > 1)
		test_flags = atoi(argv[1]) ? : test_flags;
	if (argc > 2)
		num_cpu = atoi(argv[2]) ? : num_cpu;

	if (test_flags & 0x3) {
		printf("BASE\n");
		run_perf_test(num_cpu, test_flags);
	}

	if (test_flags & 0xC) {
		snprintf(filename, sizeof(filename),
			 "%s_kprobe_kern.o", argv[0]);
		if (load_bpf_file(filename)) {
			printf("%s", bpf_log_buf);
			return 1;
		}
		printf("w/KPROBE\n");
		run_perf_test(num_cpu, test_flags >> 2);
		unload_progs();
	}

	if (test_flags & 0x30) {
		snprintf(filename, sizeof(filename),
			 "%s_tp_kern.o", argv[0]);
		if (load_bpf_file(filename)) {
			printf("%s", bpf_log_buf);
			return 1;
		}
		printf("w/TRACEPOINT\n");
		run_perf_test(num_cpu, test_flags >> 4);
		unload_progs();
	}

	return 0;
}
:</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'>2016-12-30 09:29:50 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-30 09:29:50 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/afs/misc.c?id=f3de082c12e5e9ff43c58a7561f6ec3272d03a48'>f3de082c12e5e9ff43c58a7561f6ec3272d03a48</a> (<a href='/cgit.cgi/linux/net-next.git/patch/fs/afs/misc.c?id=f3de082c12e5e9ff43c58a7561f6ec3272d03a48'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=f3de082c12e5e9ff43c58a7561f6ec3272d03a48'>8aa8afa56af93cb9f72997a57ee4db6330431f14</a> /<a href='/cgit.cgi/linux/net-next.git/tree/fs/afs/misc.c?id=f3de082c12e5e9ff43c58a7561f6ec3272d03a48'>fs/afs/misc.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/afs/misc.c?id=98473f9f3f9bd404873cd1178c8be7d6d619f0d1'>98473f9f3f9bd404873cd1178c8be7d6d619f0d1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/fs/afs/misc.c?id=f3de082c12e5e9ff43c58a7561f6ec3272d03a48&amp;id2=98473f9f3f9bd404873cd1178c8be7d6d619f0d1'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/afs/misc.c?id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>02608e02fbec04fccf2eb0cc8d8082f65c0a4286</a> (<a href='/cgit.cgi/linux/net-next.git/diff/fs/afs/misc.c?id=f3de082c12e5e9ff43c58a7561f6ec3272d03a48&amp;id2=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6</div><div class='commit-msg'>Pull crypto fix from Herbert Xu:
 "This fixes a boot failure on some platforms when crypto self test is
  enabled along with the new acomp interface"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: testmgr - Use heap buffer for acomp test input
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=f3de082c12e5e9ff43c58a7561f6ec3272d03a48'>Diffstat</a> (limited to 'fs/afs/misc.c')</div><table summary='diffstat' class='diffstat'>