linux-kernel - Re: [PATCH] perf events, x86: Add SandyBridge stalled-cycles-frontend/backend events

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Message-ID: <20110506073832.GG23166@elte.hu>
Date:	Fri, 6 May 2011 09:38:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Mike Galbraith <efault@....de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] perf events, x86: Add SandyBridge
 stalled-cycles-frontend/backend events


* Lin Ming <ming.m.lin@...el.com> wrote:

> Extend the Intel SandyBridge PMU driver with definitions
> for generic front-end and back-end stall events.
> 
> ( As commit 3011203 says, these are only approximations. )
> 
> Signed-off-by: Lin Ming <ming.m.lin@...el.com>
> ---
>  arch/x86/kernel/cpu/perf_event_intel.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
> index c1ec7a5..61cbf48 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -1485,6 +1485,12 @@ static __init int intel_pmu_init(void)
>  
>  		x86_pmu.event_constraints = intel_snb_event_constraints;
>  		x86_pmu.pebs_constraints = intel_snb_pebs_events;
> +
> +		/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
> +		intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x180010e;
> +		/* UOPS_DISPATCHED.THREAD,c=1,i=1 to count stall cycles*/
> +		intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x18001b1;
> +

Nice!

Could you check Intel Atom perhaps as well, does it have any useful event to 
approximate this?

Thanks,

	Ingo
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