Release 4.15 kernel/trace/trace_sched_switch.c

// SPDX-License-Identifier: GPL-2.0
/*
 * trace context switch
 *
 * Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com>
 *
 */
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
#include <trace/events/sched.h>

#include "trace.h"


#define RECORD_CMDLINE	1

#define RECORD_TGID	2


static int		sched_cmdline_ref;

static int		sched_tgid_ref;
static DEFINE_MUTEX(sched_register_mutex);


static void

probe_sched_switch(void *ignore, bool preempt,
		   struct task_struct *prev, struct task_struct *next)
{
	int flags;

	flags = (RECORD_TGID * !!sched_tgid_ref) +
		(RECORD_CMDLINE * !!sched_cmdline_ref);

	if (!flags)
		return;
	tracing_record_taskinfo_sched_switch(prev, next, flags);
}

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44.07%
1
16.67%
Steven Rostedt
23
38.98%
3
50.00%
Mathieu Desnoyers
7
11.86%
1
16.67%
Peter Zijlstra
3
5.08%
1
16.67%
Total
59
100.00%
6
100.00%


static void

probe_sched_wakeup(void *ignore, struct task_struct *wakee)
{
	int flags;

	flags = (RECORD_TGID * !!sched_tgid_ref) +
		(RECORD_CMDLINE * !!sched_cmdline_ref);

	if (!flags)
		return;
	tracing_record_taskinfo(current, flags);
}

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Joel Fernandes
25
51.02%
1
14.29%
Ingo Molnar
14
28.57%
2
28.57%
Mathieu Desnoyers
5
10.20%
2
28.57%
Steven Rostedt
4
8.16%
1
14.29%
Zhao Lei
1
2.04%
1
14.29%
Total
49
100.00%
7
100.00%



static int tracing_sched_register(void)
{
	int ret;

	ret = register_trace_sched_wakeup(probe_sched_wakeup, NULL);
	if (ret) {
		pr_info("wakeup trace: Couldn't activate tracepoint"
			" probe to kernel_sched_wakeup\n");
		return ret;
	}

	ret = register_trace_sched_wakeup_new(probe_sched_wakeup, NULL);
	if (ret) {
		pr_info("wakeup trace: Couldn't activate tracepoint"
			" probe to kernel_sched_wakeup_new\n");
		goto fail_deprobe;
	}

	ret = register_trace_sched_switch(probe_sched_switch, NULL);
	if (ret) {
		pr_info("sched trace: Couldn't activate tracepoint"
			" probe to kernel_sched_switch\n");
		goto fail_deprobe_wake_new;
	}

	return ret;
fail_deprobe_wake_new:
	unregister_trace_sched_wakeup_new(probe_sched_wakeup, NULL);
fail_deprobe:
	unregister_trace_sched_wakeup(probe_sched_wakeup, NULL);
	return ret;
}

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10
9.35%
1
25.00%
Wenji Huang
1
0.93%
1
25.00%
Total
107
100.00%
4
100.00%



static void tracing_sched_unregister(void)
{
	unregister_trace_sched_switch(probe_sched_switch, NULL);
	unregister_trace_sched_wakeup_new(probe_sched_wakeup, NULL);
	unregister_trace_sched_wakeup(probe_sched_wakeup, NULL);
}

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23
79.31%
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66.67%
Steven Rostedt
6
20.69%
1
33.33%
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29
100.00%
3
100.00%



static void tracing_start_sched_switch(int ops)
{
	bool sched_register = (!sched_cmdline_ref && !sched_tgid_ref);
	mutex_lock(&sched_register_mutex);

	switch (ops) {
	case RECORD_CMDLINE:
		sched_cmdline_ref++;
		break;

	case RECORD_TGID:
		sched_tgid_ref++;
		break;
	}

	if (sched_register && (sched_cmdline_ref || sched_tgid_ref))
		tracing_sched_register();
	mutex_unlock(&sched_register_mutex);
}

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38
58.46%
1
20.00%
Frédéric Weisbecker
17
26.15%
2
40.00%
Mathieu Desnoyers
9
13.85%
1
20.00%
Ingo Molnar
1
1.54%
1
20.00%
Total
65
100.00%
5
100.00%



static void tracing_stop_sched_switch(int ops)
{
	mutex_lock(&sched_register_mutex);

	switch (ops) {
	case RECORD_CMDLINE:
		sched_cmdline_ref--;
		break;

	case RECORD_TGID:
		sched_tgid_ref--;
		break;
	}

	if (!sched_cmdline_ref && !sched_tgid_ref)
		tracing_sched_unregister();
	mutex_unlock(&sched_register_mutex);
}

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Mathieu Desnoyers
14
26.92%
1
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Frédéric Weisbecker
11
21.15%
2
40.00%
Ingo Molnar
1
1.92%
1
20.00%
Total
52
100.00%
5
100.00%



void tracing_start_cmdline_record(void)
{
	tracing_start_sched_switch(RECORD_CMDLINE);
}

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9
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Joel Fernandes
3
25.00%
1
50.00%
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12
100.00%
2
100.00%



void tracing_stop_cmdline_record(void)
{
	tracing_stop_sched_switch(RECORD_CMDLINE);
}

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7
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5
41.67%
1
50.00%
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12
100.00%
2
100.00%



void tracing_start_tgid_record(void)
{
	tracing_start_sched_switch(RECORD_TGID);
}

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void tracing_stop_tgid_record(void)
{
	tracing_stop_sched_switch(RECORD_TGID);
}
Contributors
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CommitProp
Joel Fernandes
10
83.33%
1
50.00%
Steven Rostedt
2
16.67%
1
50.00%
Total
12
100.00%
2
100.00%

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Joel Fernandes
158
35.03%
1
6.25%
Mathieu Desnoyers
157
34.81%
2
12.50%
Steven Rostedt
79
17.52%
4
25.00%
Frédéric Weisbecker
35
7.76%
2
12.50%
Ingo Molnar
16
3.55%
3
18.75%
Peter Zijlstra
3
0.67%
1
6.25%
Wenji Huang
1
0.22%
1
6.25%
Zhao Lei
1
0.22%
1
6.25%
Greg Kroah-Hartman
1
0.22%
1
6.25%
Total
451
100.00%
16
100.00%
Directory: kernel/trace

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