linux-kernel - Re: perf_events: questions about cpu_has_ht

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Message-ID: <BANLkTik4aRK-Xymww5=-duy1x=qmL1C4CA@mail.gmail.com>
Date:	Sat, 23 Apr 2011 00:15:22 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Lin Ming <ming.m.lin@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"Kleen, Andi" <andi.kleen@...el.com>
Subject: Re: perf_events: questions about cpu_has_ht_siblings() and offcore support

On Fri, Apr 22, 2011 at 10:42 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, 2011-04-22 at 15:46 +0200, Stephane Eranian wrote:
>>
>> perf stat -e offcore_response_0:dmd_data_rd,offcore_response_0:dmnd_rfo ......
>>
>> This should still not be allowed.
>
> Aside from the problem you mention, I don't like the whole
> offcore_response_[01] thing. The offcore things are fully symmetric so
> the kernel should automatically select the other one if one is taken.
>
We could indeed do this. Though it would mean special casing
event codes 0xbb and 0xb7. You'd have to lookup the per-core struct
to decide whether it's worth it or not.
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