#include <string.h>
#include "perf_regs.h"
#include "thread.h"
#include "map.h"
#include "event.h"
#include "debug.h"
#include "tests/tests.h"
#include "arch-tests.h"

#define STACK_SIZE 8192

static int sample_ustack(struct perf_sample *sample,
			 struct thread *thread, u64 *regs)
{
	struct stack_dump *stack = &sample->user_stack;
	struct map *map;
	unsigned long sp;
	u64 stack_size, *buf;

	buf = malloc(STACK_SIZE);
	if (!buf) {
		pr_debug("failed to allocate sample uregs data\n");
		return -1;
	}

	sp = (unsigned long) regs[PERF_REG_X86_SP];

	map = map_groups__find(thread->mg, MAP__VARIABLE, (u64) sp);
	if (!map) {
		pr_debug("failed to get stack map\n");
		free(buf);
		return -1;
	}

	stack_size = map->end - sp;
	stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;

	memcpy(buf, (void *) sp, stack_size);
	stack->data = (char *) buf;
	stack->size = stack_size;
	return 0;
}

int test__arch_unwind_sample(struct perf_sample *sample,
			     struct thread *thread)
{
	struct regs_dump *regs = &sample->user_regs;
	u64 *buf;

	buf = malloc(sizeof(u64) * PERF_REGS_MAX);
	if (!buf) {
		pr_debug("failed to allocate sample uregs data\n");
		return -1;
	}

	perf_regs_load(buf);
	regs->abi  = PERF_SAMPLE_REGS_ABI;
	regs->regs = buf;
	regs->mask = PERF_REGS_MASK;

	return sample_ustack(sample, thread, buf);
}
alue='switch'/></form></td></tr>
<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
<table class='tabs'><tr><td>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/fs?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>fs</a>/<a href='/cgit.cgi/linux/net-next.git/commit/fs/nfsd?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>nfsd</a>/<a href='/cgit.cgi/linux/net-next.git/commit/fs/nfsd/auth.h?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>auth.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'/><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>Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;</td><td class='right'>2017-01-30 19:27:10 -0500</td></tr>
<tr><th>committer</th><td>Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;</td><td class='right'>2017-01-31 09:13:49 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/nfsd/auth.h?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>79c6f448c8b79c321e4a1f31f98194e4f6b6cae7</a> (<a href='/cgit.cgi/linux/net-next.git/patch/fs/nfsd/auth.h?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>370efda701f03cccf21e02bb1fdd3b852547d75c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/fs/nfsd/auth.h?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>fs/nfsd/auth.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/nfsd/auth.h?id=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>0c744ea4f77d72b3dcebb7a8f2684633ec79be88</a> (<a href='/cgit.cgi/linux/net-next.git/diff/fs/nfsd/auth.h?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7&amp;id2=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>diff</a>)</td></tr></table>
<div class='commit-subject'>tracing: Fix hwlat kthread migration</div><div class='commit-msg'>The hwlat tracer creates a kernel thread at start of the tracer. It is
pinned to a single CPU and will move to the next CPU after each period of
running. If the user modifies the migration thread's affinity, it will not
change after that happens.

The original code created the thread at the first instance it was called,
but later was changed to destroy the thread after the tracer was finished,
and would not be created until the next instance of the tracer was
established. The code that initialized the affinity was only called on the
initial instantiation of the tracer. After that, it was not initialized, and
the previous affinity did not match the current newly created one, making
it appear that the user modified the thread's affinity when it did not, and
the thread failed to migrate again.

Cc: stable@vger.kernel.org
Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs")
Signed-off-by: Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>Diffstat</a> (limited to 'fs/nfsd/auth.h')</div><table summary='diffstat' class='diffstat'>