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Date: Fri, 29 May 2009 12:27:31 -0400 (EDT)
From: Steven Rostedt <rostedt@...dmis.org>
To: GeunSik Lim <leemgs1@...il.com>
cc: Greg KH <greg@...ah.com>,
linux-kernel <linux-kernel@...r.kernel.org>, trivial@...nel.org,
balagi@...tmail.de, bgamari@...il.com, Ingo Molnar <mingo@...e.hu>,
inaky.perez-gonzalez@...el.com
Subject: Re: [RFC V2 PATCH]debugfs:Fix terminology inconsistency of dir name
to mount debugfs filesystem.
On Sat, 30 May 2009, GeunSik Lim wrote:
> diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
> index fd9a3e6..cbc6cca 100644
> --- a/Documentation/trace/ftrace.txt
> +++ b/Documentation/trace/ftrace.txt
> @@ -35,11 +35,11 @@ well as the files to display output.
>
> To mount the debugfs system:
>
> - # mkdir /debug
> - # mount -t debugfs nodev /debug
> + # mkdir /sys/kernel/debug
If you configure debugfs into the kernel, the directory /sys/kernel/debug
will automatically be created. Remember, /sys is a psuedo filesystem as
well.
> + # mount -t debugfs nodev /sys/kernel/debug
>
> ( Note: it is more common to mount at /sys/kernel/debug, but for
> - simplicity this document will use /debug)
> + simplicity this document will use /sys/kernel/debug)
LOL!
>
> That's it! (assuming that you have ftrace configured into your kernel)
>
> @@ -389,18 +389,18 @@ trace_options
> The trace_options file is used to control what gets printed in
> the trace output. To see what is available, simply cat the file:
>
> - cat /debug/tracing/trace_options
> + cat /sys/kernel/debug/tracing/trace_options
> print-parent nosym-offset nosym-addr noverbose noraw nohex nobin \
> noblock nostacktrace nosched-tree nouserstacktrace nosym-userobj
>
> To disable one of the options, echo in the option prepended with
> "no".
>
> - echo noprint-parent > /debug/tracing/trace_options
> + echo noprint-parent > /sys/kernel/debug/tracing/trace_options
>
> To enable an option, leave off the "no".
>
> - echo sym-offset > /debug/tracing/trace_options
> + echo sym-offset > /sys/kernel/debug/tracing/trace_options
>
> Here are the available options:
>
> @@ -476,11 +476,11 @@ sched_switch
> This tracer simply records schedule switches. Here is an example
> of how to use it.
>
> - # echo sched_switch > /debug/tracing/current_tracer
> - # echo 1 > /debug/tracing/tracing_enabled
> + # echo sched_switch > /sys/kernel/debug/tracing/current_tracer
> + # echo 1 > /sys/kernel/debug/tracing/tracing_enabled
> # sleep 1
> - # echo 0 > /debug/tracing/tracing_enabled
> - # cat /debug/tracing/trace
> + # echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> + # cat /sys/kernel/debug/tracing/trace
>
> # tracer: sched_switch
> #
> @@ -574,13 +574,13 @@ new trace is saved.
> To reset the maximum, echo 0 into tracing_max_latency. Here is
> an example:
>
> - # echo irqsoff > /debug/tracing/current_tracer
> - # echo 0 > /debug/tracing/tracing_max_latency
> - # echo 1 > /debug/tracing/tracing_enabled
> + # echo irqsoff > /sys/kernel/debug/tracing/current_tracer
> + # echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
> + # echo 1 > /sys/kernel/debug/tracing/tracing_enabled
> # ls -ltr
> [...]
> - # echo 0 > /debug/tracing/tracing_enabled
> - # cat /debug/tracing/latency_trace
> + # echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> + # cat /sys/kernel/debug/tracing/latency_trace
> # tracer: irqsoff
> #
> irqsoff latency trace v1.1.5 on 2.6.26
> @@ -681,13 +681,13 @@ Like the irqsoff tracer, it records the maximum latency for
> which preemption was disabled. The control of preemptoff tracer
> is much like the irqsoff tracer.
>
> - # echo preemptoff > /debug/tracing/current_tracer
> - # echo 0 > /debug/tracing/tracing_max_latency
> - # echo 1 > /debug/tracing/tracing_enabled
> + # echo preemptoff > /sys/kernel/debug/tracing/current_tracer
> + # echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
> + # echo 1 > /sys/kernel/debug/tracing/tracing_enabled
> # ls -ltr
> [...]
> - # echo 0 > /debug/tracing/tracing_enabled
> - # cat /debug/tracing/latency_trace
> + # echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> + # cat /sys/kernel/debug/tracing/latency_trace
> # tracer: preemptoff
> #
> preemptoff latency trace v1.1.5 on 2.6.26-rc8
> @@ -828,13 +828,13 @@ tracer.
> Again, using this trace is much like the irqsoff and preemptoff
> tracers.
>
> - # echo preemptirqsoff > /debug/tracing/current_tracer
> - # echo 0 > /debug/tracing/tracing_max_latency
> - # echo 1 > /debug/tracing/tracing_enabled
> + # echo preemptirqsoff > /sys/kernel/debug/tracing/current_tracer
> + # echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
> + # echo 1 > /sys/kernel/debug/tracing/tracing_enabled
> # ls -ltr
> [...]
> - # echo 0 > /debug/tracing/tracing_enabled
> - # cat /debug/tracing/latency_trace
> + # echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> + # cat /sys/kernel/debug/tracing/latency_trace
> # tracer: preemptirqsoff
> #
> preemptirqsoff latency trace v1.1.5 on 2.6.26-rc8
> @@ -990,12 +990,12 @@ slightly differently than we did with the previous tracers.
> Instead of performing an 'ls', we will run 'sleep 1' under
> 'chrt' which changes the priority of the task.
>
> - # echo wakeup > /debug/tracing/current_tracer
> - # echo 0 > /debug/tracing/tracing_max_latency
> - # echo 1 > /debug/tracing/tracing_enabled
> + # echo wakeup > /sys/kernel/debug/tracing/current_tracer
> + # echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
> + # echo 1 > /sys/kernel/debug/tracing/tracing_enabled
Egad! This is exactly why I hate the path name. It distracts so much from
the eyes to what you want to accomplish. It seems that because it is a
tradition to use this /sys/kernel/debug path, that I'm destine to fail in
my discuss for it. I will ask that this document suggest the following at
the beginning.
===
When debugfs is configured into the kernel (which selecting any ftrace
option will do) the directory /sys/kernel/debug will be created. To mount
this directory, you can add to your /etc/fstab file:
debugfs /debug debugfs defaults 0 0
Or you can mount it at run time with:
mount -t debugfs nodev /sys/kernel/debug
For quicker access to that directory you may want to make a soft link to
it:
ln -s /sys/kernel/debug /debug
Any selected ftrace option will also create a directory called tracing
within the debugfs. The rest of the document will assume that you are in
the ftrace directory (cd /sys/kernel/debugfs) and will only concentrate
on the files within that directory and not distract from the content with
the extended "/sys/kernel/debug/tracing" path name.
===
And then we can change all your other changes in this file as:
s,/sys/kernel/debug/tracing,,
-- Steve
> # chrt -f 5 sleep 1
> - # echo 0 > /debug/tracing/tracing_enabled
> - # cat /debug/tracing/latency_trace
> + # echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> + # cat /sys/kernel/debug/tracing/latency_trace
> # tracer: wakeup
> #
> wakeup latency trace v1.1.5 on 2.6.26-rc8
> @@ -1105,11 +1105,11 @@ can be done from the debug file system. Make sure the
> ftrace_enabled is set; otherwise this tracer is a nop.
>
> # sysctl kernel.ftrace_enabled=1
> - # echo function > /debug/tracing/current_tracer
> - # echo 1 > /debug/tracing/tracing_enabled
> + # echo function > /sys/kernel/debug/tracing/current_tracer
> + # echo 1 > /sys/kernel/debug/tracing/tracing_enabled
> # usleep 1
> - # echo 0 > /debug/tracing/tracing_enabled
> - # cat /debug/tracing/trace
> + # echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> + # cat /sys/kernel/debug/tracing/trace
> # tracer: function
> #
> # TASK-PID CPU# TIMESTAMP FUNCTION
> @@ -1146,7 +1146,7 @@ int trace_fd;
> [...]
> int main(int argc, char *argv[]) {
> [...]
> - trace_fd = open("/debug/tracing/tracing_enabled", O_WRONLY);
> + trace_fd = open("/sys/kernel/debug/tracing/tracing_enabled", O_WRONLY);
> [...]
> if (condition_hit()) {
> write(trace_fd, "0", 1);
> @@ -1155,7 +1155,7 @@ int main(int argc, char *argv[]) {
> }
>
> Note: Here we hard coded the path name. The debugfs mount is not
> -guaranteed to be at /debug (and is more commonly at
> +guaranteed to be at /sys/kernel/debug (and is more commonly at
> /sys/kernel/debug). For simple one time traces, the above is
> sufficent. For anything else, a search through /proc/mounts may
> be needed to find where the debugfs file-system is mounted.
> @@ -1164,16 +1164,16 @@ be needed to find where the debugfs file-system is mounted.
> Single thread tracing
> ---------------------
>
> -By writing into /debug/tracing/set_ftrace_pid you can trace a
> +By writing into /sys/kernel/debug/tracing/set_ftrace_pid you can trace a
> single thread. For example:
>
> -# cat /debug/tracing/set_ftrace_pid
> +# cat /sys/kernel/debug/tracing/set_ftrace_pid
> no pid
> -# echo 3111 > /debug/tracing/set_ftrace_pid
> -# cat /debug/tracing/set_ftrace_pid
> +# echo 3111 > /sys/kernel/debug/tracing/set_ftrace_pid
> +# cat /sys/kernel/debug/tracing/set_ftrace_pid
> 3111
> -# echo function > /debug/tracing/current_tracer
> -# cat /debug/tracing/trace | head
> +# echo function > /sys/kernel/debug/tracing/current_tracer
> +# cat /sys/kernel/debug/tracing/trace | head
> # tracer: function
> #
> # TASK-PID CPU# TIMESTAMP FUNCTION
> @@ -1184,8 +1184,8 @@ no pid
> yum-updatesd-3111 [003] 1637.254683: lock_hrtimer_base <-hrtimer_try_to_cancel
> yum-updatesd-3111 [003] 1637.254685: fget_light <-do_sys_poll
> yum-updatesd-3111 [003] 1637.254686: pipe_poll <-do_sys_poll
> -# echo -1 > /debug/tracing/set_ftrace_pid
> -# cat /debug/tracing/trace |head
> +# echo -1 > /sys/kernel/debug/tracing/set_ftrace_pid
> +# cat /sys/kernel/debug/tracing/trace |head
> # tracer: function
> #
> # TASK-PID CPU# TIMESTAMP FUNCTION
> @@ -1217,12 +1217,12 @@ int main (int argc, char **argv)
> char line[64];
> int s;
>
> - ffd = open("/debug/tracing/current_tracer", O_WRONLY);
> + ffd = open("/sys/kernel/debug/tracing/current_tracer", O_WRONLY);
> if (ffd < 0)
> exit(-1);
> write(ffd, "nop", 3);
>
> - fd = open("/debug/tracing/set_ftrace_pid", O_WRONLY);
> + fd = open("/sys/kernel/debug/tracing/set_ftrace_pid", O_WRONLY);
> s = sprintf(line, "%d\n", getpid());
> write(fd, line, s);
>
> @@ -1374,22 +1374,22 @@ want, depending on your needs.
> tracing_cpu_mask file) or you might sometimes see unordered
> function calls while cpu tracing switch.
>
> - hide: echo nofuncgraph-cpu > /debug/tracing/trace_options
> - show: echo funcgraph-cpu > /debug/tracing/trace_options
> + hide: echo nofuncgraph-cpu > /sys/kernel/debug/tracing/trace_options
> + show: echo funcgraph-cpu > /sys/kernel/debug/tracing/trace_options
>
> - The duration (function's time of execution) is displayed on
> the closing bracket line of a function or on the same line
> than the current function in case of a leaf one. It is default
> enabled.
>
> - hide: echo nofuncgraph-duration > /debug/tracing/trace_options
> - show: echo funcgraph-duration > /debug/tracing/trace_options
> + hide: echo nofuncgraph-duration > /sys/kernel/debug/tracing/trace_options
> + show: echo funcgraph-duration > /sys/kernel/debug/tracing/trace_options
>
> - The overhead field precedes the duration field in case of
> reached duration thresholds.
>
> - hide: echo nofuncgraph-overhead > /debug/tracing/trace_options
> - show: echo funcgraph-overhead > /debug/tracing/trace_options
> + hide: echo nofuncgraph-overhead > /sys/kernel/debug/tracing/trace_options
> + show: echo funcgraph-overhead > /sys/kernel/debug/tracing/trace_options
> depends on: funcgraph-duration
>
> ie:
> @@ -1418,8 +1418,8 @@ want, depending on your needs.
> - The task/pid field displays the thread cmdline and pid which
> executed the function. It is default disabled.
>
> - hide: echo nofuncgraph-proc > /debug/tracing/trace_options
> - show: echo funcgraph-proc > /debug/tracing/trace_options
> + hide: echo nofuncgraph-proc > /sys/kernel/debug/tracing/trace_options
> + show: echo funcgraph-proc > /sys/kernel/debug/tracing/trace_options
>
> ie:
>
> @@ -1442,8 +1442,8 @@ want, depending on your needs.
> system clock since it started. A snapshot of this time is
> given on each entry/exit of functions
>
> - hide: echo nofuncgraph-abstime > /debug/tracing/trace_options
> - show: echo funcgraph-abstime > /debug/tracing/trace_options
> + hide: echo nofuncgraph-abstime > /sys/kernel/debug/tracing/trace_options
> + show: echo funcgraph-abstime > /sys/kernel/debug/tracing/trace_options
>
> ie:
>
> @@ -1540,7 +1540,7 @@ listed in:
>
> available_filter_functions
>
> - # cat /debug/tracing/available_filter_functions
> + # cat /sys/kernel/debug/tracing/available_filter_functions
> put_prev_task_idle
> kmem_cache_create
> pick_next_task_rt
> @@ -1552,12 +1552,12 @@ mutex_lock
> If I am only interested in sys_nanosleep and hrtimer_interrupt:
>
> # echo sys_nanosleep hrtimer_interrupt \
> - > /debug/tracing/set_ftrace_filter
> - # echo ftrace > /debug/tracing/current_tracer
> - # echo 1 > /debug/tracing/tracing_enabled
> + > /sys/kernel/debug/tracing/set_ftrace_filter
> + # echo ftrace > /sys/kernel/debug/tracing/current_tracer
> + # echo 1 > /sys/kernel/debug/tracing/tracing_enabled
> # usleep 1
> - # echo 0 > /debug/tracing/tracing_enabled
> - # cat /debug/tracing/trace
> + # echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> + # cat /sys/kernel/debug/tracing/trace
> # tracer: ftrace
> #
> # TASK-PID CPU# TIMESTAMP FUNCTION
> @@ -1568,7 +1568,7 @@ If I am only interested in sys_nanosleep and hrtimer_interrupt:
>
> To see which functions are being traced, you can cat the file:
>
> - # cat /debug/tracing/set_ftrace_filter
> + # cat /sys/kernel/debug/tracing/set_ftrace_filter
> hrtimer_interrupt
> sys_nanosleep
>
> @@ -1588,7 +1588,7 @@ Note: It is better to use quotes to enclose the wild cards,
> otherwise the shell may expand the parameters into names
> of files in the local directory.
>
> - # echo 'hrtimer_*' > /debug/tracing/set_ftrace_filter
> + # echo 'hrtimer_*' > /sys/kernel/debug/tracing/set_ftrace_filter
>
> Produces:
>
> @@ -1609,7 +1609,7 @@ Produces:
>
> Notice that we lost the sys_nanosleep.
>
> - # cat /debug/tracing/set_ftrace_filter
> + # cat /sys/kernel/debug/tracing/set_ftrace_filter
> hrtimer_run_queues
> hrtimer_run_pending
> hrtimer_init
> @@ -1635,17 +1635,17 @@ To append to the filters, use '>>'
> To clear out a filter so that all functions will be recorded
> again:
>
> - # echo > /debug/tracing/set_ftrace_filter
> - # cat /debug/tracing/set_ftrace_filter
> + # echo > /sys/kernel/debug/tracing/set_ftrace_filter
> + # cat /sys/kernel/debug/tracing/set_ftrace_filter
> #
>
> Again, now we want to append.
>
> - # echo sys_nanosleep > /debug/tracing/set_ftrace_filter
> - # cat /debug/tracing/set_ftrace_filter
> + # echo sys_nanosleep > /sys/kernel/debug/tracing/set_ftrace_filter
> + # cat /sys/kernel/debug/tracing/set_ftrace_filter
> sys_nanosleep
> - # echo 'hrtimer_*' >> /debug/tracing/set_ftrace_filter
> - # cat /debug/tracing/set_ftrace_filter
> + # echo 'hrtimer_*' >> /sys/kernel/debug/tracing/set_ftrace_filter
> + # cat /sys/kernel/debug/tracing/set_ftrace_filter
> hrtimer_run_queues
> hrtimer_run_pending
> hrtimer_init
> @@ -1668,7 +1668,7 @@ hrtimer_init_sleeper
> The set_ftrace_notrace prevents those functions from being
> traced.
>
> - # echo '*preempt*' '*lock*' > /debug/tracing/set_ftrace_notrace
> + # echo '*preempt*' '*lock*' > /sys/kernel/debug/tracing/set_ftrace_notrace
>
> Produces:
>
> @@ -1758,13 +1758,13 @@ the effect on the tracing is different. Every read from
> trace_pipe is consumed. This means that subsequent reads will be
> different. The trace is live.
>
> - # echo function > /debug/tracing/current_tracer
> - # cat /debug/tracing/trace_pipe > /tmp/trace.out &
> + # echo function > /sys/kernel/debug/tracing/current_tracer
> + # cat /sys/kernel/debug/tracing/trace_pipe > /tmp/trace.out &
> [1] 4153
> - # echo 1 > /debug/tracing/tracing_enabled
> + # echo 1 > /sys/kernel/debug/tracing/tracing_enabled
> # usleep 1
> - # echo 0 > /debug/tracing/tracing_enabled
> - # cat /debug/tracing/trace
> + # echo 0 > /sys/kernel/debug/tracing/tracing_enabled
> + # cat /sys/kernel/debug/tracing/trace
> # tracer: function
> #
> # TASK-PID CPU# TIMESTAMP FUNCTION
> @@ -1800,7 +1800,7 @@ number listed is the number of entries that can be recorded per
> CPU. To know the full size, multiply the number of possible CPUS
> with the number of entries.
>
> - # cat /debug/tracing/buffer_size_kb
> + # cat /sys/kernel/debug/tracing/buffer_size_kb
> 1408 (units kilobytes)
>
> Note, to modify this, you must have tracing completely disabled.
> @@ -1808,18 +1808,18 @@ To do that, echo "nop" into the current_tracer. If the
> current_tracer is not set to "nop", an EINVAL error will be
> returned.
>
> - # echo nop > /debug/tracing/current_tracer
> - # echo 10000 > /debug/tracing/buffer_size_kb
> - # cat /debug/tracing/buffer_size_kb
> + # echo nop > /sys/kernel/debug/tracing/current_tracer
> + # echo 10000 > /sys/kernel/debug/tracing/buffer_size_kb
> + # cat /sys/kernel/debug/tracing/buffer_size_kb
> 10000 (units kilobytes)
>
> The number of pages which will be allocated is limited to a
> percentage of available memory. Allocating too much will produce
> an error.
>
> - # echo 1000000000000 > /debug/tracing/buffer_size_kb
> + # echo 1000000000000 > /sys/kernel/debug/tracing/buffer_size_kb
> -bash: echo: write error: Cannot allocate memory
> - # cat /debug/tracing/buffer_size_kb
> + # cat /sys/kernel/debug/tracing/buffer_size_kb
> 85
>
> -----------
> diff --git a/Documentation/trace/mmiotrace.txt b/Documentation/trace/mmiotrace.txt
> index 5731c67..162effb 100644
> --- a/Documentation/trace/mmiotrace.txt
> +++ b/Documentation/trace/mmiotrace.txt
> @@ -32,41 +32,41 @@ is no way to automatically detect if you are losing events due to CPUs racing.
> Usage Quick Reference
> ---------------------
>
> -$ mount -t debugfs debugfs /debug
> -$ echo mmiotrace > /debug/tracing/current_tracer
> -$ cat /debug/tracing/trace_pipe > mydump.txt &
> +$ mount -t debugfs debugfs /sys/kernel/debug
> +$ echo mmiotrace > /sys/kernel/debug/tracing/current_tracer
> +$ cat /sys/kernel/debug/tracing/trace_pipe > mydump.txt &
> Start X or whatever.
> -$ echo "X is up" > /debug/tracing/trace_marker
> -$ echo nop > /debug/tracing/current_tracer
> +$ echo "X is up" > /sys/kernel/debug/tracing/trace_marker
> +$ echo nop > /sys/kernel/debug/tracing/current_tracer
> Check for lost events.
>
>
> Usage
> -----
>
> -Make sure debugfs is mounted to /debug. If not, (requires root privileges)
> -$ mount -t debugfs debugfs /debug
> +Make sure debugfs is mounted to /sys/kernel/debug. If not, (requires root privileges)
> +$ mount -t debugfs debugfs /sys/kernel/debug
>
> Check that the driver you are about to trace is not loaded.
>
> Activate mmiotrace (requires root privileges):
> -$ echo mmiotrace > /debug/tracing/current_tracer
> +$ echo mmiotrace > /sys/kernel/debug/tracing/current_tracer
>
> Start storing the trace:
> -$ cat /debug/tracing/trace_pipe > mydump.txt &
> +$ cat /sys/kernel/debug/tracing/trace_pipe > mydump.txt &
> The 'cat' process should stay running (sleeping) in the background.
>
> Load the driver you want to trace and use it. Mmiotrace will only catch MMIO
> accesses to areas that are ioremapped while mmiotrace is active.
>
> During tracing you can place comments (markers) into the trace by
> -$ echo "X is up" > /debug/tracing/trace_marker
> +$ echo "X is up" > /sys/kernel/debug/tracing/trace_marker
> This makes it easier to see which part of the (huge) trace corresponds to
> which action. It is recommended to place descriptive markers about what you
> do.
>
> Shut down mmiotrace (requires root privileges):
> -$ echo nop > /debug/tracing/current_tracer
> +$ echo nop > /sys/kernel/debug/tracing/current_tracer
> The 'cat' process exits. If it does not, kill it by issuing 'fg' command and
> pressing ctrl+c.
>
> @@ -78,10 +78,10 @@ to view your kernel log and look for "mmiotrace has lost events" warning. If
> events were lost, the trace is incomplete. You should enlarge the buffers and
> try again. Buffers are enlarged by first seeing how large the current buffers
> are:
> -$ cat /debug/tracing/buffer_size_kb
> +$ cat /sys/kernel/debug/tracing/buffer_size_kb
> gives you a number. Approximately double this number and write it back, for
> instance:
> -$ echo 128000 > /debug/tracing/buffer_size_kb
> +$ echo 128000 > /sys/kernel/debug/tracing/buffer_size_kb
> Then start again from the top.
>
> If you are doing a trace for a driver project, e.g. Nouveau, you should also
> diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
> index dc7a8c3..9aa8932 100644
> --- a/drivers/block/pktcdvd.c
> +++ b/drivers/block/pktcdvd.c
> @@ -430,7 +430,7 @@ static void pkt_sysfs_cleanup(void)
> /********************************************************************
> entries in debugfs
>
> - /debugfs/pktcdvd[0-7]/
> + /sys/kernel/debug/pktcdvd[0-7]/
> info
>
> *******************************************************************/
> diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
> index c77c6c6..6ce0e26 100644
> --- a/drivers/gpu/drm/drm_debugfs.c
> +++ b/drivers/gpu/drm/drm_debugfs.c
> @@ -105,7 +105,7 @@ int drm_debugfs_create_files(struct drm_info_list *files, int count,
> ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
> root, tmp, &drm_debugfs_fops);
> if (!ent) {
> - DRM_ERROR("Cannot create /debugfs/dri/%s/%s\n",
> + DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n",
> name, files[i].name);
> drm_free(tmp, sizeof(struct drm_info_node),
> _DRM_DRIVER);
> @@ -133,9 +133,9 @@ EXPORT_SYMBOL(drm_debugfs_create_files);
> * \param minor device minor number
> * \param root DRI debugfs dir entry.
> *
> - * Create the DRI debugfs root entry "/debugfs/dri", the device debugfs root entry
> - * "/debugfs/dri/%minor%/", and each entry in debugfs_list as
> - * "/debugfs/dri/%minor%/%name%".
> + * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry
> + * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as
> + * "/sys/kernel/debug/dri/%minor%/%name%".
> */
> int drm_debugfs_init(struct drm_minor *minor, int minor_id,
> struct dentry *root)
> @@ -148,7 +148,7 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
> sprintf(name, "%d", minor_id);
> minor->debugfs_root = debugfs_create_dir(name, root);
> if (!minor->debugfs_root) {
> - DRM_ERROR("Cannot create /debugfs/dri/%s\n", name);
> + DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
> return -1;
> }
>
> @@ -165,7 +165,7 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
> ret = dev->driver->debugfs_init(minor);
> if (ret) {
> DRM_ERROR("DRM: Driver failed to initialize "
> - "/debugfs/dri.\n");
> + "/sys/kernel/debug/dri.\n");
> return ret;
> }
> }
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 019b7c5..1bf7efd 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -339,7 +339,7 @@ static int __init drm_core_init(void)
>
> drm_debugfs_root = debugfs_create_dir("dri", NULL);
> if (!drm_debugfs_root) {
> - DRM_ERROR("Cannot create /debugfs/dri\n");
> + DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
> ret = -1;
> goto err_p3;
> }
> diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
> index b9631e3..b2a93c4 100644
> --- a/drivers/gpu/drm/drm_stub.c
> +++ b/drivers/gpu/drm/drm_stub.c
> @@ -328,7 +328,7 @@ static int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int t
> #if defined(CONFIG_DEBUG_FS)
> ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
> if (ret) {
> - DRM_ERROR("DRM: Failed to initialize /debugfs/dri.\n");
> + DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
> goto err_g2;
> }
> #endif
> diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
> index 214a92d..a170cea 100644
> --- a/drivers/net/Kconfig
> +++ b/drivers/net/Kconfig
> @@ -2200,7 +2200,7 @@ config SKGE_DEBUG
> depends on SKGE && DEBUG_FS
> help
> This option adds the ability to dump driver state for debugging.
> - The file debugfs/skge/ethX displays the state of the internal
> + The file /sys/kernel/debug/skge/ethX displays the state of the internal
> transmit and receive rings.
>
> If unsure, say N.
> @@ -2226,7 +2226,7 @@ config SKY2_DEBUG
> depends on SKY2 && DEBUG_FS
> help
> This option adds the ability to dump driver state for debugging.
> - The file debugfs/sky2/ethX displays the state of the internal
> + The file /sys/kernel/debug/sky2/ethX displays the state of the internal
> transmit and receive rings.
>
> If unsure, say N.
> diff --git a/drivers/net/wimax/i2400m/i2400m.h b/drivers/net/wimax/i2400m/i2400m.h
> index 3ae2df3..da2e8f2 100644
> --- a/drivers/net/wimax/i2400m/i2400m.h
> +++ b/drivers/net/wimax/i2400m/i2400m.h
> @@ -389,7 +389,7 @@ struct i2400m {
> unsigned ready:1; /* all probing steps done */
> unsigned rx_reorder:1; /* RX reorder is enabled */
> u8 trace_msg_from_user; /* echo rx msgs to 'trace' pipe */
> - /* typed u8 so debugfs/u8 can tweak */
> + /* typed u8 so /sys/kernel/debug/u8 can tweak */
> enum i2400m_system_state state;
> wait_queue_head_t state_wq; /* Woken up when on state updates */
>
> diff --git a/drivers/net/wireless/ath5k/Kconfig b/drivers/net/wireless/ath5k/Kconfig
> index 75383a5..fdfa708 100644
> --- a/drivers/net/wireless/ath5k/Kconfig
> +++ b/drivers/net/wireless/ath5k/Kconfig
> @@ -27,11 +27,11 @@ config ATH5K_DEBUG
> Say Y, if and you will get debug options for ath5k.
> To use this, you need to mount debugfs:
>
> - mkdir /debug/
> - mount -t debugfs debug /debug/
> + mkdir /sys/kernel/debug/
> + mount -t debugfs debug /sys/kernel/debug/
>
> You will get access to files under:
> - /debug/ath5k/phy0/
> + /sys/kernel/debug/ath5k/phy0/
>
> To enable debug, pass the debug level to the debug module
> parameter. For example:
> diff --git a/drivers/net/wireless/libertas/README b/drivers/net/wireless/libertas/README
> index d860fc3..ab6a2d5 100644
> --- a/drivers/net/wireless/libertas/README
> +++ b/drivers/net/wireless/libertas/README
> @@ -72,7 +72,7 @@ rdrf
> location that is to be read. This parameter must be specified in
> hexadecimal (its possible to preceed preceding the number with a "0x").
>
> - Path: /debugfs/libertas_wireless/ethX/registers/
> + Path: /sys/kernel/debug/libertas_wireless/ethX/registers/
>
> Usage:
> echo "0xa123" > rdmac ; cat rdmac
> @@ -95,7 +95,7 @@ wrrf
> sleepparams
> This command is used to set the sleepclock configurations
>
> - Path: /debugfs/libertas_wireless/ethX/
> + Path: /sys/kernel/debug/libertas_wireless/ethX/
>
> Usage:
> cat sleepparams: reads the current sleepclock configuration
> @@ -115,7 +115,7 @@ subscribed_events
> The subscribed_events directory contains the interface for the
> subscribed events API.
>
> - Path: /debugfs/libertas_wireless/ethX/subscribed_events/
> + Path: /sys/kernel/debug/libertas_wireless/ethX/subscribed_events/
>
> Each event is represented by a filename. Each filename consists of the
> following three fields:
> @@ -165,7 +165,7 @@ subscribed_events
> extscan
> This command is used to do a specific scan.
>
> - Path: /debugfs/libertas_wireless/ethX/
> + Path: /sys/kernel/debug/libertas_wireless/ethX/
>
> Usage: echo "SSID" > extscan
>
> @@ -179,7 +179,7 @@ getscantable
> Display the current contents of the driver scan table (ie. get the
> scan results).
>
> - Path: /debugfs/libertas_wireless/ethX/
> + Path: /sys/kernel/debug/libertas_wireless/ethX/
>
> Usage:
> cat getscantable
> @@ -188,7 +188,7 @@ setuserscan
> Initiate a customized scan and retrieve the results
>
>
> - Path: /debugfs/libertas_wireless/ethX/
> + Path: /sys/kernel/debug/libertas_wireless/ethX/
>
> Usage:
> echo "[ARGS]" > setuserscan
> diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
> index 52be564..9112380 100644
> --- a/drivers/scsi/lpfc/lpfc_debugfs.c
> +++ b/drivers/scsi/lpfc/lpfc_debugfs.c
> @@ -51,8 +51,8 @@
> * debugfs interface
> *
> * To access this interface the user should:
> - * # mkdir /debug
> - * # mount -t debugfs none /debug
> + * # mkdir /sys/kernel/debug
> + * # mount -t debugfs none /sys/kernel/debug
> *
> * The lpfc debugfs directory hierarchy is:
> * lpfc/lpfcX/vportY
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 883cd44..99b7aad 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -406,7 +406,7 @@ static inline char *pack_hex_byte(char *buf, u8 byte)
> *
> * Use tracing_on/tracing_off when you want to quickly turn on or off
> * tracing. It simply enables or disables the recording of the trace events.
> - * This also corresponds to the user space debugfs/tracing/tracing_on
> + * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
> * file, which gives a means for the kernel and userspace to interact.
> * Place a tracing_off() in the kernel where you want tracing to end.
> * From user space, examine the trace, and then echo 1 > tracing_on
> diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
> index d35a7ee..9c9ac7d 100644
> --- a/include/linux/tracepoint.h
> +++ b/include/linux/tracepoint.h
> @@ -197,7 +197,7 @@ static inline void tracepoint_synchronize_unregister(void)
> * * This is how the trace record is structured and will
> * * be saved into the ring buffer. These are the fields
> * * that will be exposed to user-space in
> - * * /debug/tracing/events/<*>/format.
> + * * /sys/kernel/debug/tracing/events/<*>/format.
> * *
> * * The declared 'local variable' is called '__entry'
> * *
> @@ -257,7 +257,7 @@ static inline void tracepoint_synchronize_unregister(void)
> * tracepoint callback (this is used by programmatic plugins and
> * can also by used by generic instrumentation like SystemTap), and
> * it is also used to expose a structured trace record in
> - * /debug/tracing/events/.
> + * /sys/kernel/debug/tracing/events/.
> */
>
> #define TRACE_EVENT(name, proto, args, struct, assign, print) \
> diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
> index 417d198..e5ce28f 100644
> --- a/kernel/trace/Kconfig
> +++ b/kernel/trace/Kconfig
> @@ -120,7 +120,7 @@ config IRQSOFF_TRACER
> disabled by default and can be runtime (re-)started
> via:
>
> - echo 0 > /debugfs/tracing/tracing_max_latency
> + echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
>
> (Note that kernel size and overhead increases with this option
> enabled. This option and the preempt-off timing option can be
> @@ -141,7 +141,7 @@ config PREEMPT_TRACER
> disabled by default and can be runtime (re-)started
> via:
>
> - echo 0 > /debugfs/tracing/tracing_max_latency
> + echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
>
> (Note that kernel size and overhead increases with this option
> enabled. This option and the irqs-off timing option can be
> @@ -213,7 +213,7 @@ config TRACE_BRANCH_PROFILING
> This tracer profiles all the the likely and unlikely macros
> in the kernel. It will display the results in:
>
> - /debugfs/tracing/profile_annotated_branch
> + /sys/kernel/debug/tracing/profile_annotated_branch
>
> Note: this will add a significant overhead, only turn this
> on if you need to profile the system's use of these macros.
> @@ -228,7 +228,7 @@ config PROFILE_ALL_BRANCHES
> taken in the kernel is recorded whether it hit or miss.
> The results will be displayed in:
>
> - /debugfs/tracing/profile_branch
> + /sys/kernel/debug/tracing/profile_branch
>
> This configuration, when enabled, will impose a great overhead
> on the system. This should only be enabled when the system
> @@ -276,7 +276,7 @@ config STACK_TRACER
> select KALLSYMS
> help
> This special tracer records the maximum stack footprint of the
> - kernel and displays it in debugfs/tracing/stack_trace.
> + kernel and displays it in /sys/kernel/debug/tracing/stack_trace.
>
> This tracer works by hooking into every function call that the
> kernel executes, and keeping a maximum stack depth value and
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index cda81ec..9b94d57 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -335,7 +335,7 @@ static raw_spinlock_t ftrace_max_lock =
> /*
> * Copy the new maximum trace into the separate maximum-trace
> * structure. (this way the maximum trace is permanently saved,
> - * for later retrieval via /debugfs/tracing/latency_trace)
> + * for later retrieval via /sys/kernel/debug/tracing/latency_trace)
> */
> static void
> __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
> @@ -2366,21 +2366,21 @@ static const struct file_operations tracing_iter_fops = {
>
> static const char readme_msg[] =
> "tracing mini-HOWTO:\n\n"
> - "# mkdir /debug\n"
> - "# mount -t debugfs nodev /debug\n\n"
> - "# cat /debug/tracing/available_tracers\n"
> + "# mkdir /sys/kernel/debug\n"
> + "# mount -t debugfs nodev /sys/kernel/debug\n\n"
> + "# cat /sys/kernel/debug/tracing/available_tracers\n"
> "wakeup preemptirqsoff preemptoff irqsoff function sched_switch nop\n\n"
> - "# cat /debug/tracing/current_tracer\n"
> + "# cat /sys/kernel/debug/tracing/current_tracer\n"
> "nop\n"
> - "# echo sched_switch > /debug/tracing/current_tracer\n"
> - "# cat /debug/tracing/current_tracer\n"
> + "# echo sched_switch > /sys/kernel/debug/tracing/current_tracer\n"
> + "# cat /sys/kernel/debug/tracing/current_tracer\n"
> "sched_switch\n"
> - "# cat /debug/tracing/trace_options\n"
> + "# cat /sys/kernel/debug/tracing/trace_options\n"
> "noprint-parent nosym-offset nosym-addr noverbose\n"
> - "# echo print-parent > /debug/tracing/trace_options\n"
> - "# echo 1 > /debug/tracing/tracing_enabled\n"
> - "# cat /debug/tracing/trace > /tmp/trace.txt\n"
> - "# echo 0 > /debug/tracing/tracing_enabled\n"
> + "# echo print-parent > /sys/kernel/debug/tracing/trace_options\n"
> + "# echo 1 > /sys/kernel/debug/tracing/tracing_enabled\n"
> + "# cat /sys/kernel/debug/tracing/trace > /tmp/trace.txt\n"
> + "# echo 0 > /sys/kernel/debug/tracing/tracing_enabled\n"
> ;
>
> static ssize_t
> diff --git a/scripts/tracing/draw_functrace.py b/scripts/tracing/draw_functrace.py
> index 902f9a9..66f4d1b 100644
> --- a/scripts/tracing/draw_functrace.py
> +++ b/scripts/tracing/draw_functrace.py
> @@ -12,10 +12,10 @@ calls. Only the functions's names and the the call time are provided.
>
> Usage:
> Be sure that you have CONFIG_FUNCTION_TRACER
> - # mkdir /debugfs
> - # mount -t debug debug /debug
> - # echo function > /debug/tracing/current_tracer
> - $ cat /debug/tracing/trace_pipe > ~/raw_trace_func
> + # mkdir /sys/kernel/debug
> + # mount -t debug debug /sys/kernel/debug
> + # echo function > /sys/kernel/debug/tracing/current_tracer
> + $ cat /sys/kernel/debug/tracing/trace_pipe > ~/raw_trace_func
> Wait some times but not too much, the script is a bit slow.
> Break the pipe (Ctrl + Z)
> $ scripts/draw_functrace.py < raw_trace_func > draw_functrace
> --
> 1.6.3.1
>
>
> -----------------------------------------------
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>
> GeunSik Lim ( S A M S U N G E L E C T R O N I C S )
> e-Mail :1) geunsik.lim@...sung.com
> 2) leemgs@...il.com , leemgs1@...il.com
> HomePage: http://blog.naver.com/invain/
> -----------------------------------------------
>
>
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