linux-kernel - Re: [PATCH 01/10] perf, trace: Remove IRQ-disable from perf/tracepoint interaction

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Date:	Fri, 21 May 2010 13:43:49 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/10] perf, trace: Remove IRQ-disable from perf/tracepoint interaction


Peter Zijlstra <a.p.zijlstra@...llo.nl> writes:

> [...]
> @@ -799,13 +799,10 @@ perf_trace_templ_##call(struct ftrace_ev
>  static notrace void perf_trace_##call(proto)				\
>  {									\
>  	struct ftrace_event_call *event_call = &event_##call;		\
> -	struct pt_regs *__regs = &get_cpu_var(perf_trace_regs);		\
> -									\
> -	perf_fetch_caller_regs(__regs, 1);				\
> -									\
> -	perf_trace_templ_##template(event_call, __regs, args);		\
> +	struct pt_regs __regs;						\
>  									\
> -	put_cpu_var(perf_trace_regs);					\
> +	perf_fetch_caller_regs(&__regs, 1);				\
> +	perf_trace_templ_##template(event_call, &__regs, args);		\
>  }
>  [...]

To what extent are you worried about something the size of struct
pt_regs being auto/stack allocated?


- FChE
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