Date: Fri, 11 Jul 2014 09:58:08 +0200
From: Jiri Olsa <jolsa@redhat.com>
To: Stephane Eranian <eranian@google.com>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, mingo@elte.hu,
        ak@linux.intel.com, acme@redhat.com, namhyung@kernel.org
Subject: Re: [PATCH 1/4] perf: add ability to sample machine state on
 interrupt
Message-ID: <20140711075808.GA21557@krava.redhat.com>
References: <1404857759-25105-1-git-send-email-eranian@google.com>
 <1404857759-25105-2-git-send-email-eranian@google.com>
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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.
> 
> The list of available registers is arch
> dependent and provided by asm/perf_regs.h
> 
> Registers are laid out as u64 in the order
> of the bit order of sample_intr_regs.

SNIP

>  };
>  
>  /*
> @@ -334,6 +335,15 @@ struct perf_event_attr {
>  
>  	/* Align to u64. */
>  	__u32	__reserved_2;
> +	/*
> +	 * Defines set of user regs to dump on samples.
                          ^^ interrupt 

jirka
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