linux-kernel - Re: [PATCH 2/2] perf: Carve out callchain functionality

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Date:	Wed, 11 May 2011 15:30:12 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Borislav Petkov <bp@...64.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 2/2] perf: Carve out callchain functionality

On Wed, May 11, 2011 at 03:16:56PM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <borislav.petkov@....com>
> 
> Move callchain-related code into its own module:
> kernel/events/callchain.c
> 
> No functionality change.
> 
> Signed-off-by: Borislav Petkov <borislav.petkov@....com>
> ---
>  include/linux/perf_event.h |    7 +-
>  kernel/events/Makefile     |    2 +-
>  kernel/events/callchain.c  |  182 +++++++++++++++++++++++++++++++++
>  kernel/events/core.c       |  237 +++++--------------------------------------
>  4 files changed, 217 insertions(+), 211 deletions(-)
>  create mode 100644 kernel/events/callchain.c
> 
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 687f852..7978850 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -961,7 +961,6 @@ enum event_type_t {
>  };
>  
>  #ifdef CONFIG_PERF_EVENTS
> -
>  extern struct list_head pmus;
>  extern int perf_pmu_register(struct pmu *pmu, char *name, int type);
>  extern void perf_pmu_unregister(struct pmu *pmu);
> @@ -1201,6 +1200,12 @@ static inline void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
>  extern int
>  task_function_call(struct task_struct *p, int (*func) (void *info), void *info);
>  extern u64 perf_event_time(struct perf_event *event);
> +
> +extern int get_recursion_context(int *recursion);
> +extern inline void put_recursion_context(int *recursion, int rctx);
> +extern void put_callchain_buffers(void);
> +extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
> +extern int get_callchain_buffers(void);

I think it would be better to have these in a private kernel/events/events.h

Other than that, looks good, thanks.

Acked-by: Frederic Weisbecker <fweisbec@...il.com>
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