* [PATCH 1/1] ftrace: fix function graph tracer
@ 2012-02-17 16:09 Rajesh Bhagat
2012-02-17 17:22 ` Steven Rostedt
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Rajesh Bhagat @ 2012-02-17 16:09 UTC (permalink / raw)
To: Steven Rostedt, Frederic Weisbecker, Ingo Molnar; +Cc: linux-kernel
>From 31f8971a19b45aae8227c6d143a6ecde26fa68b2 Mon Sep 17 00:00:00 2001
From: Rajesh Bhagat <rajesh.lnx@gmail.com>
Date: Fri, 17 Feb 2012 13:59:15 +0530
Subject: [PATCH 1/1] ftrace: fix function graph tracer
when function tracer is set - function_graph tracer is not working
Problem occurs when CONFIG_DYNAMIC_FTRACE is not set
Output before patch
/debug/tracing # echo function > current_tracer
/debug/tracing # echo function_graph > current_tracer
/debug/tracing # cat trace
Output after patch
/debug/tracing # echo function > current_tracer
/debug/tracing # echo function_graph > current_tracer
/debug/tracing # cat trace
0) ! 253.375 us | } /* irq_enter */
0) | generic_handle_irq() {
0) | handle_fasteoi_irq() {
0) 9.208 us | _raw_spin_lock();
0) | handle_irq_event() {
0) | handle_irq_event_percpu() {
Signed-off-by: Rajesh Bhagat <rajesh.lnx@gmail.com>
---
kernel/trace/ftrace.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 683d559..dc2de98 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -219,7 +219,8 @@ static void update_ftrace_function(void)
#else
__ftrace_trace_function = func;
#endif
- ftrace_trace_function = ftrace_test_stop_func;
+ ftrace_trace_function =
+ (func == ftrace_stub) ? func : ftrace_test_stop_func;
#endif
}
--
1.7.6
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] ftrace: fix function graph tracer
2012-02-17 16:09 [PATCH 1/1] ftrace: fix function graph tracer Rajesh Bhagat
@ 2012-02-17 17:22 ` Steven Rostedt
2012-03-03 5:06 ` Steven Rostedt
2012-03-13 13:36 ` Steven Rostedt
2 siblings, 0 replies; 5+ messages in thread
From: Steven Rostedt @ 2012-02-17 17:22 UTC (permalink / raw)
To: Rajesh Bhagat; +Cc: Frederic Weisbecker, Ingo Molnar, linux-kernel
On Fri, 2012-02-17 at 21:39 +0530, Rajesh Bhagat wrote:
> ---
> kernel/trace/ftrace.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 683d559..dc2de98 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -219,7 +219,8 @@ static void update_ftrace_function(void)
> #else
> __ftrace_trace_function = func;
> #endif
> - ftrace_trace_function = ftrace_test_stop_func;
> + ftrace_trace_function =
> + (func == ftrace_stub) ? func : ftrace_test_stop_func;
> #endif
> }
Nice catch! This should also go into stable. When I get back from the
conference I'll start getting it upstream.
Thanks,
-- Steve
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] ftrace: fix function graph tracer
2012-02-17 16:09 [PATCH 1/1] ftrace: fix function graph tracer Rajesh Bhagat
2012-02-17 17:22 ` Steven Rostedt
@ 2012-03-03 5:06 ` Steven Rostedt
2012-03-13 13:36 ` Steven Rostedt
2 siblings, 0 replies; 5+ messages in thread
From: Steven Rostedt @ 2012-03-03 5:06 UTC (permalink / raw)
To: Rajesh Bhagat; +Cc: Frederic Weisbecker, Ingo Molnar, linux-kernel
On Fri, 2012-02-17 at 21:39 +0530, Rajesh Bhagat wrote:
> >From 31f8971a19b45aae8227c6d143a6ecde26fa68b2 Mon Sep 17 00:00:00 2001
> From: Rajesh Bhagat <rajesh.lnx@gmail.com>
> Date: Fri, 17 Feb 2012 13:59:15 +0530
> Subject: [PATCH 1/1] ftrace: fix function graph tracer
>
> when function tracer is set - function_graph tracer is not working
> Problem occurs when CONFIG_DYNAMIC_FTRACE is not set
>
> Output before patch
> /debug/tracing # echo function > current_tracer
> /debug/tracing # echo function_graph > current_tracer
> /debug/tracing # cat trace
I can't reproduce this. What arch did you see this on? I'm trying it on
PPC and x86, and it works fine.
Now I'm not saying I wont take this patch, because it is a correctness
issue. But I'm thinking this will go into the 3.4 queue.
-- Steve
>
> Output after patch
> /debug/tracing # echo function > current_tracer
> /debug/tracing # echo function_graph > current_tracer
> /debug/tracing # cat trace
> 0) ! 253.375 us | } /* irq_enter */
> 0) | generic_handle_irq() {
> 0) | handle_fasteoi_irq() {
> 0) 9.208 us | _raw_spin_lock();
> 0) | handle_irq_event() {
> 0) | handle_irq_event_percpu() {
>
> Signed-off-by: Rajesh Bhagat <rajesh.lnx@gmail.com>
> ---
> kernel/trace/ftrace.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 683d559..dc2de98 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -219,7 +219,8 @@ static void update_ftrace_function(void)
> #else
> __ftrace_trace_function = func;
> #endif
> - ftrace_trace_function = ftrace_test_stop_func;
> + ftrace_trace_function =
> + (func == ftrace_stub) ? func : ftrace_test_stop_func;
> #endif
> }
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] ftrace: fix function graph tracer
2012-02-17 16:09 [PATCH 1/1] ftrace: fix function graph tracer Rajesh Bhagat
2012-02-17 17:22 ` Steven Rostedt
2012-03-03 5:06 ` Steven Rostedt
@ 2012-03-13 13:36 ` Steven Rostedt
2012-03-16 5:06 ` Rajesh Bhagat
2 siblings, 1 reply; 5+ messages in thread
From: Steven Rostedt @ 2012-03-13 13:36 UTC (permalink / raw)
To: Rajesh Bhagat; +Cc: Frederic Weisbecker, Ingo Molnar, linux-kernel
> Signed-off-by: Rajesh Bhagat <rajesh.lnx@gmail.com>
> ---
> kernel/trace/ftrace.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 683d559..dc2de98 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -219,7 +219,8 @@ static void update_ftrace_function(void)
> #else
> __ftrace_trace_function = func;
> #endif
> - ftrace_trace_function = ftrace_test_stop_func;
> + ftrace_trace_function =
> + (func == ftrace_stub) ? func : ftrace_test_stop_func;
> #endif
> }
BTW, this patch has major whitespace issues. It does not apply.
-- Steve
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] ftrace: fix function graph tracer
2012-03-13 13:36 ` Steven Rostedt
@ 2012-03-16 5:06 ` Rajesh Bhagat
0 siblings, 0 replies; 5+ messages in thread
From: Rajesh Bhagat @ 2012-03-16 5:06 UTC (permalink / raw)
To: Steven Rostedt; +Cc: Frederic Weisbecker, Ingo Molnar, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 1343 bytes --]
Hello Steve,
Sorry this is the first time im doing this, so i just copied the patch
in gmail.
Please find the correct patch attached to this email, with 0
checkpatch.pl errors.
[bhagatr@linux git]$ vi 0001-ftrace-fix-function-graph-tracer.patch
(reverse-i-search)`':
[bhagatr@linux git]$ ./linux-2.6/scripts/checkpatch.pl
0001-ftrace-fix-function-graph-tracer.patch
total: 0 errors, 0 warnings, 9 lines checked
I will also try to send a V2 of this patch, as soon my "git
send-email" is up and running.
- Rajesh
On Tue, Mar 13, 2012 at 7:06 PM, Steven Rostedt <rostedt@goodmis.org> wrote:
>
>
> > Signed-off-by: Rajesh Bhagat <rajesh.lnx@gmail.com>
> > ---
> > kernel/trace/ftrace.c | 3 ++-
> > 1 files changed, 2 insertions(+), 1 deletions(-)
> > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> > index 683d559..dc2de98 100644
> > --- a/kernel/trace/ftrace.c
> > +++ b/kernel/trace/ftrace.c
> > @@ -219,7 +219,8 @@ static void update_ftrace_function(void)
> > #else
> > __ftrace_trace_function = func;
> > #endif
> > - ftrace_trace_function = ftrace_test_stop_func;
> > + ftrace_trace_function =
> > + (func == ftrace_stub) ? func : ftrace_test_stop_func;
> > #endif
> > }
>
> BTW, this patch has major whitespace issues. It does not apply.
>
> -- Steve
>
>
[-- Attachment #2: 0001-ftrace-fix-function-graph-tracer.patch --]
[-- Type: application/octet-stream, Size: 1363 bytes --]
From 31f8971a19b45aae8227c6d143a6ecde26fa68b2 Mon Sep 17 00:00:00 2001
From: Rajesh Bhagat <rajesh.lnx@gmail.com>
Date: Fri, 17 Feb 2012 13:59:15 +0530
Subject: [PATCH 1/1] ftrace: fix function graph tracer
when function tracer is set - function_graph tracer is not working
Problem occurs when CONFIG_DYNAMIC_FTRACE is not set
Output before patch
/debug/tracing # echo function > current_tracer
/debug/tracing # echo function_graph > current_tracer
/debug/tracing # cat trace
Output after patch
/debug/tracing # echo function > current_tracer
/debug/tracing # echo function_graph > current_tracer
/debug/tracing # cat trace
0) ! 253.375 us | } /* irq_enter */
0) | generic_handle_irq() {
0) | handle_fasteoi_irq() {
0) 9.208 us | _raw_spin_lock();
0) | handle_irq_event() {
0) | handle_irq_event_percpu() {
Signed-off-by: Rajesh Bhagat <rajesh.lnx@gmail.com>
---
kernel/trace/ftrace.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 683d559..dc2de98 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -219,7 +219,8 @@ static void update_ftrace_function(void)
#else
__ftrace_trace_function = func;
#endif
- ftrace_trace_function = ftrace_test_stop_func;
+ ftrace_trace_function =
+ (func == ftrace_stub) ? func : ftrace_test_stop_func;
#endif
}
--
1.7.6
^ permalink raw reply related [flat|nested] 5+ messages in thread
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2012-02-17 16:09 [PATCH 1/1] ftrace: fix function graph tracer Rajesh Bhagat
2012-02-17 17:22 ` Steven Rostedt
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2012-03-13 13:36 ` Steven Rostedt
2012-03-16 5:06 ` Rajesh Bhagat
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