From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Venkatesh Srinivas <venkateshs@google.com>,
LKML <linux-kernel@vger.kernel.org>,
"mingo@elte.hu" <mingo@elte.hu>,
"ak@linux.intel.com" <ak@linux.intel.com>,
"Yan, Zheng" <zheng.z.yan@intel.com>
Subject: Re: [PATCH] perf/x86/intel: Use rdmsrl_safe when initializing RAPL PMU.
Date: Wed, 23 Apr 2014 17:09:12 +0200 [thread overview]
Message-ID: <20140423150912.GO11096@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CABPqkBT5xg+zQ45dugHiXM5XFYi+V3gsBmANevx25fE0S0iNXA@mail.gmail.com>
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.
next prev parent reply other threads:[~2014-04-23 15:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-13 19:36 [PATCH] perf/x86/intel: Use rdmsrl_safe when initializing RAPL PMU Venkatesh Srinivas
2014-03-14 8:44 ` Peter Zijlstra
2014-03-14 13:56 ` Andi Kleen
2014-03-14 15:21 ` Venkatesh Srinivas
2014-03-14 16:17 ` Andi Kleen
2014-03-14 16:57 ` David Ahern
2014-03-14 23:07 ` Venkatesh Srinivas
2014-04-18 13:08 ` [tip:perf/core] perf/x86/intel: Use rdmsrl_safe() " tip-bot for Venkatesh Srinivas
2014-04-23 14:31 ` [PATCH] perf/x86/intel: Use rdmsrl_safe " Stephane Eranian
2014-04-23 14:45 ` Peter Zijlstra
2014-04-23 14:49 ` Stephane Eranian
2014-04-23 15:09 ` Peter Zijlstra [this message]
2014-04-23 15:14 ` Stephane Eranian
2014-04-23 15:16 ` Borislav Petkov
2014-04-23 15:18 ` Stephane Eranian
2014-04-23 15:35 ` Borislav Petkov
2014-04-23 15:44 ` Stephane Eranian
2014-04-23 15:55 ` Borislav Petkov
-- strict thread matches above, loose matches on Subject: below --
2014-03-07 4:42 Venkatesh Srinivas
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