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

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Message-ID: <20140711081107.GB21557@krava.redhat.com>
Date:	Fri, 11 Jul 2014 10:11:07 +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.
> 
> 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.
                      ^^^ sample_regs_intr

just crossed my ming we want to use 'kernel' here and call it 'sample_regs_kernel',
since we already have sample_regs_user. Also for events other than HW, the sample
does not happen in interrupt..  anyway:

Reviewed-by: Jiri Olsa <jolsa@...nel.org>

jirka
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