linux-kernel - Re: [PATCH 03/23] perf: Add ability to attach user level registers dump to sample

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Date:	Wed, 27 Jun 2012 17:11:03 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, eranian@...gle.com,
	gorcunov@...nvz.org, tzanussi@...il.com, mhiramat@...hat.com,
	robert.richter@....com, fche@...hat.com,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org
Subject: Re: [PATCH 03/23] perf: Add ability to attach user level registers
 dump to sample

On Tue, Jun 19, 2012 at 05:47:54PM +0200, Jiri Olsa wrote:
> @@ -4061,6 +4105,19 @@ void perf_prepare_sample(struct perf_event_header *header,
>  		}
>  		header->size += size;
>  	}
> +
> +	if (sample_type & PERF_SAMPLE_REGS_USER) {
> +		/* regs dump available bool */
> +		int size = sizeof(u64);
> +
> +		data->regs_user = perf_sample_regs_user(regs);
> +		if (data->regs_user) {
> +			u64 mask = event->attr.sample_regs_user;
> +			size += hweight64(mask) * sizeof(u64);
> +		}
> +
> +		header->size += size;

We'll need to remove the 64 bits registers for compat tasks but other than
that, it looks ok.
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