#include <math.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/timeb.h>
#include <sched.h>
#include <errno.h>

void usage(char *name) {
	printf ("Usage: %s cpunum\n", name);
}

int main(int argc, char **argv) {
	int i, cpu, fd;
	char msr_file_name[64];
	long long tsc, old_tsc, new_tsc;
	long long aperf, old_aperf, new_aperf;
	long long mperf, old_mperf, new_mperf;
	struct timeb before, after;
	long long int start, finish, total;
	cpu_set_t cpuset;

	if (argc != 2) {
		usage(argv[0]);
		return 1;
	}

	errno = 0;
	cpu = strtol(argv[1], (char **) NULL, 10);

	if (errno) {
		usage(argv[0]);
		return 1;
	}

	sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
	fd = open(msr_file_name, O_RDONLY);

	if (fd == -1) {
		perror("Failed to open");
		return 1;
	}

	CPU_ZERO(&cpuset);
	CPU_SET(cpu, &cpuset);

	if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {
		perror("Failed to set cpu affinity");
		return 1;
	}

	ftime(&before);
	pread(fd, &old_tsc,  sizeof(old_tsc), 0x10);
	pread(fd, &old_aperf,  sizeof(old_mperf), 0xe7);
	pread(fd, &old_mperf,  sizeof(old_aperf), 0xe8);

	for (i=0; i<0x8fffffff; i++) {
		sqrt(i);
	}

	ftime(&after);
	pread(fd, &new_tsc,  sizeof(new_tsc), 0x10);
	pread(fd, &new_aperf,  sizeof(new_mperf), 0xe7);
	pread(fd, &new_mperf,  sizeof(new_aperf), 0xe8);

	tsc = new_tsc-old_tsc;
	aperf = new_aperf-old_aperf;
	mperf = new_mperf-old_mperf;

	start = before.time*1000 + before.millitm;
	finish = after.time*1000 + after.millitm;
	total = finish - start;

	printf("runTime: %4.2f\n", 1.0*total/1000);
	printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
	return 0;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/rds?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>rds</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/rds/page.c?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>page.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'/><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'>2017-01-16 09:34:37 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-16 09:34:37 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/rds/page.c?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/rds/page.c?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>4d8ea8e6ca52f1938269937834641205d8d888f0</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/rds/page.c?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>net/rds/page.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/rds/page.c?id=49def1853334396f948dcb4cedb9347abb318df5'>49def1853334396f948dcb4cedb9347abb318df5</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/rds/page.c?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc&amp;id2=49def1853334396f948dcb4cedb9347abb318df5'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/rds/page.c?id=ce1ca7d2d140a1f4aaffd297ac487f246963dd2f'>ce1ca7d2d140a1f4aaffd297ac487f246963dd2f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/rds/page.c?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc&amp;id2=ce1ca7d2d140a1f4aaffd297ac487f246963dd2f'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'nfsd-4.10-1' of git://linux-nfs.org/~bfields/linux</div><div class='commit-msg'>Pull nfsd fixes from Bruce Fields:
 "Miscellaneous nfsd bugfixes, one for a 4.10 regression, three for
  older bugs"

* tag 'nfsd-4.10-1' of git://linux-nfs.org/~bfields/linux:
  svcrdma: avoid duplicate dma unmapping during error recovery
  sunrpc: don't call sleeping functions from the notifier block callbacks
  svcrpc: don't leak contexts on PROC_DESTROY
  nfsd: fix supported attributes for acl &amp; labels
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=2eabb8b8d68bc9c7779ba8b04bec8d4f8baed0bc'>Diffstat</a> (limited to 'net/rds/page.c')</div><table summary='diffstat' class='diffstat'>