linux-kernel - Re: [PATCH] perf/x86/intel: Use rdmsrl

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Date:	Wed, 23 Apr 2014 17:09:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Venkatesh Srinivas <venkateshs@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>
Subject: Re: [PATCH] perf/x86/intel: Use rdmsrl_safe when initializing RAPL
 PMU.

On Wed, Apr 23, 2014 at 04:49:55PM +0200, Stephane Eranian wrote:
> On your machine, booted with 3.15-rc2, do you have /sys/devices/power?
> If not, and you have at least an SNB, you should have RAPL and that
> RAPL_UNIT MSR.
> 
> Proof is that if you read that MSR using /dev/cpu/msr it works just fine:
> # modprobe msr
> # rdmsr 0x606
> a1003
> 
> So something is broken somewhere.

I've not got SNB+ class hardware (for testing). But I believe you that
there's something funny, I just do not understanding how *msr_safe()
could cause this.
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