linux-kernel - Re: [PATCH v3 6/9] perf, x86: handle multiple records in PEBS buffer

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Date:	Mon, 28 Jul 2014 05:34:29 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	mingo@...nel.org, acme@...radead.org, eranian@...gle.com
Subject: Re: [PATCH v3 6/9] perf, x86: handle multiple records in PEBS
 buffer

> how about following patch

Looks good to me. 

This will also solve the existing problem that perf record -e cycles:u
... gives kernel samples too.

-Andi

> diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
> index 33b4c0e..ea76507 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
> @@ -1016,6 +1016,16 @@ static void setup_pebs_sample_data(struct perf_event *event,
>  		data->br_stack = &cpuc->lbr_stack;
>  }
>  
> +static inline bool intel_pmu_pebs_filter(struct perf_event *event,
> +					 struct pebs_record_nhm *record)
> +{
> +	if (event->attr.exclude_user && !kernel_ip(record->ip))
> +		return true;
> +	if (event->attr.exclude_kernel && kernel_ip(record->ip))
> +		return true;
> +	return false;
> +}
> +
>  static void __intel_pmu_pebs_event(struct perf_event *event,
>  				   struct pt_regs *iregs,
>  				   void *at, void *top, int count)
> @@ -1052,6 +1062,8 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
>  		struct pebs_record_nhm *p = at;
>  		if (!(p->status & (1 << event->hw.idx)))
>  			continue;
> +		if (intel_pmu_pebs_filter(event, p))
> +			continue;
>  
>  		setup_pebs_sample_data(event, iregs, at, &data, &regs);
>  		perf_output_sample(&handle, &header, &data, event);
> @@ -1139,6 +1151,8 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs)
>  			WARN_ON_ONCE(!event);
>  			if (!event->attr.precise_ip)
>  				continue;
> +			if (intel_pmu_pebs_filter(event, p))
> +				continue;
>  			counts[bit]++;
>  		}
>  	}
> @@ -1149,7 +1163,8 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs)
>  		event = cpuc->events[bit];
>  		for (at = base; at < top; at += x86_pmu.pebs_record_size) {
>  			struct pebs_record_nhm *p = at;
> -			if (p->status & (1 << bit))
> +			if ((p->status & (1 << bit)) &&
> +			    !intel_pmu_pebs_filter(event, p))
>  				break;
>  		}
>  
> ---
> 

-- 
ak@...ux.intel.com -- Speaking for myself only.
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