linux-kernel - Re: [PATCH 4/7] perf, x86: Implement IBS interrupt handler

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Message-ID: <1312285408.1147.115.camel@twins>
Date:	Tue, 02 Aug 2011 13:43:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/7] perf, x86: Implement IBS interrupt handler

On Thu, 2011-07-28 at 15:46 +0200, Robert Richter wrote:
> +       msr = hwc->config_base;
> +       buf = buffer;
> +       rdmsrl(msr++, *buf);
> +       if (!(*buf++ & perf_ibs->valid_mask))
> +               return 0;
> +
> +       perf_sample_data_init(&data, 0);
> +       if (event->attr.sample_type & PERF_SAMPLE_RAW) {
> +               for (i = 1; i < perf_ibs->reg_count; i++)
> +                       rdmsrl(msr++, *buf++);
> +               raw.size = sizeof(u32) + sizeof(u64) * perf_ibs->reg_count;
> +               raw.data = buffer;
> +               data.raw = &raw;
> +       } 

OK, so this dumps a linear range of MSRs into the raw data buffer. The
only 'problem' I have with that is that Fam12 will then also dump 103A
IBS Control Register, which seems pointless.
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