linux-kernel - Re: [PATCH 1/4] perf: add ability to sample machine state on interrupt

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Message-ID: <20140711081424.GA31646@krava.redhat.com>
Date:	Fri, 11 Jul 2014 10:14:25 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, namhyung@...nel.org
Subject: Re: [PATCH 1/4] perf: add ability to sample machine state on
 interrupt

On Wed, Jul 09, 2014 at 12:15:56AM +0200, Stephane Eranian wrote:
> Enable capture of interrupted machine state in each
> sample.
> 
> Registers to sample are passed per event in the
> sample_regs_intr bitmask.
> 
> To sample interrupt machine state, the 
> PERF_SAMPLE_INTR_REGS must be passed in
> sample_type.

SNIP

> index 57e9190..018939c 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -4296,7 +4296,7 @@ perf_output_sample_regs(struct perf_output_handle *handle,
>  	}
>  }
>  
> -static void perf_sample_regs_user(struct perf_regs_user *regs_user,
> +static void perf_sample_regs_user(struct perf_regs *regs_user,
>  				  struct pt_regs *regs)
>  {
>  	if (!user_mode(regs)) {
> @@ -4312,6 +4312,14 @@ static void perf_sample_regs_user(struct perf_regs_user *regs_user,
>  	}
>  }
>  
> +static void perf_sample_regs_intr(struct perf_regs *regs_user,
> +				  struct pt_regs *regs)
> +{
> +	regs_user->regs = regs;
> +	regs_user->abi  = perf_reg_abi(current);

             ^^^ regs_intr

jirka
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