Commit 2af15d6a authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
Browse files

ftrace: add kernel command line function filtering 



When using ftrace=function on the command line to trace functions
on boot up, one can not filter out functions that are commonly called.

This patch adds two new ftrace command line commands.

  ftrace_notrace=function-list
  ftrace_filter=function-list

Where function-list is a comma separated list of functions to filter.
The ftrace_notrace will make the functions listed not be included
in the function tracing, and ftrace_filter will only trace the functions
listed.

These two act the same as the debugfs/tracing/set_ftrace_notrace and
debugfs/tracing/set_ftrace_filter respectively.

The simple glob expressions that are allowed by the filter files can also
be used by the command line interface.

	ftrace_notrace=rcu*,*lock,*spin*

Will not trace any function that starts with rcu, ends with lock, or has
the word spin in it.

Note, if the self tests are enabled, they may interfere with the filtering
set by the command lines.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent f2aebaee

Documentation/kernel-parameters.txt

+15 −2
Original line number Diff line number Diff line
@@ -751,12 +751,25 @@ and is between 256 and 4096 characters. It is defined in the file 
			ia64_pal_cache_flush instead of SAL_CACHE_FLUSH.



	ftrace=[tracer]

			[ftrace] will set and start the specified tracer

			[FTRACE] will set and start the specified tracer

			as early as possible in order to facilitate early

			boot debugging.



	ftrace_dump_on_oops

			[ftrace] will dump the trace buffers on oops.

			[FTRACE] will dump the trace buffers on oops.



	ftrace_filter=[function-list]

			[FTRACE] Limit the functions traced by the function

			tracer at boot up. function-list is a comma separated

			list of functions. This list can be changed at run

			time by the set_ftrace_filter file in the debugfs

			tracing directory. 



	ftrace_notrace=[function-list]

			[FTRACE] Do not trace the functions specified in

			function-list. This list can be changed at run time

			by the set_ftrace_notrace file in the debugfs

			tracing directory.



	gamecon.map[2|3]=

			[HW,JOY] Multisystem joystick and NES/SNES/PSX pad

kernel/trace/ftrace.c

+42 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <trace/events/sched.h>



#include <asm/ftrace.h>

#include <asm/setup.h>



#include "trace_output.h"

#include "trace_stat.h"
@@ -2369,6 +2370,45 @@ void ftrace_set_notrace(unsigned char *buf, int len, int reset) 
	ftrace_set_regex(buf, len, reset, 0);

}



/*

 * command line interface to allow users to set filters on boot up.

 */

#define FTRACE_FILTER_SIZE		COMMAND_LINE_SIZE

static char ftrace_notrace_buf[FTRACE_FILTER_SIZE] __initdata;

static char ftrace_filter_buf[FTRACE_FILTER_SIZE] __initdata;



static int __init set_ftrace_notrace(char *str)

{

	strncpy(ftrace_notrace_buf, str, FTRACE_FILTER_SIZE);

	return 1;

}

__setup("ftrace_notrace=", set_ftrace_notrace);



static int __init set_ftrace_filter(char *str)

{

	strncpy(ftrace_filter_buf, str, FTRACE_FILTER_SIZE);

	return 1;

}

__setup("ftrace_filter=", set_ftrace_filter);



static void __init set_ftrace_early_filter(char *buf, int enable)

{

	char *func;



	while (buf) {

		func = strsep(&buf, ",");

		ftrace_set_regex(func, strlen(func), 0, enable);

	}

}



static void __init set_ftrace_early_filters(void)

{

	if (ftrace_filter_buf[0])

		set_ftrace_early_filter(ftrace_filter_buf, 1);

	if (ftrace_notrace_buf[0])

		set_ftrace_early_filter(ftrace_notrace_buf, 0);

}



static int

ftrace_regex_release(struct inode *inode, struct file *file, int enable)

{
@@ -2829,6 +2869,8 @@ void __init ftrace_init(void) 
	if (ret)

		pr_warning("Failed to register trace ftrace module notifier\n");



	set_ftrace_early_filters();



	return;

 failed:

	ftrace_disabled = 1;

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