linux-kernel - Re: [for-next][PATCH 04/21] ftrace: Optimize function graph to be called directly

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Date:	Mon, 14 Jul 2014 16:46:40 +0300
From:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [for-next][PATCH 04/21] ftrace: Optimize function graph to be
 called directly



On 12/07/14 06:37, Steven Rostedt wrote:
> On Fri, 11 Jul 2014 23:36:10 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
>
>> I'll worked on getting arm to be called directly too. Can you test that
>> patch as well? I'll reply to this email with that one.
>
> Here's that patch:
>
> -- Steve
>
>  From ff9ee792640d802415eaedf0e8d41992c898d2a9 Mon Sep 17 00:00:00 2001
> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> Date: Fri, 11 Jul 2014 23:28:11 -0400
> Subject: [PATCH] ARM: ftrace: Allow function graph tracer to have its own
>   trampoline
>
> The ftrace infrastructure now allows the function graph tracer
> trampoline to be called directly instead of having to first go
> through the function tracer trampoline. But in order for this to
> work, the function graph tracer must be dependent from the function
> tracer trampoline. Currently in ARM, the function graph tracer
> does not save registers as it depends on the function tracer
> trampoline to do so.
>
> By adding a ftrace_graph_tramp_caller function that saves the regs
> then does the function graph tracing work, this can be used as
> the trampoline for function graph tracing.
>
> Link: http://lkml.kernel.org/r/53BED155.9040607@nvidia.com
>
> Reported-by: Tuomas Tynkkynen <ttynkkynen@...dia.com>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>   arch/arm/include/asm/ftrace.h  | 5 +++++
>   arch/arm/kernel/entry-common.S | 7 +++++++
>   2 files changed, 12 insertions(+)
>
[...]

Thanks, both of these patches work for me.

Tested-by: Tuomas Tynkkynen <ttynkkynen@...dia.com>

- Tuomas

-- 
nvpublic
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