From: Andi Kleen <ak@linux.intel.com>
To: "Liang, Kan" <kan.liang@intel.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>,
Peter Zijlstra <peterz@infradead.org>,
"Odzioba, Lukasz" <lukasz.odzioba@intel.com>,
Stephane Eranian <eranian@google.com>,
"mingo@redhat.com" <mingo@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Subject: Re: [PATCH] perf/x86: fix event counter update issue
Date: Wed, 22 Feb 2017 11:18:48 -0800 [thread overview]
Message-ID: <20170222191848.GE1712@tassilo.jf.intel.com> (raw)
In-Reply-To: <37D7C6CF3E00A74B8858931C1DB2F077536A9963@SHSMSX103.ccr.corp.intel.com>
> No. It related to the counter width. The number of bits we can use should be
> 1 bit less than the total width. Otherwise, there will be problem.
> For big cores such as haswell, broadwell, skylake, the counter width is 48 bit.
> So we can only use 47 bits.
> For Silvermont and KNL, the counter width is only 32 bit I think. So we can only
> use 31 bits.
It is 40 bits on these cores, so 39bits.
-Andi
next prev parent reply other threads:[~2017-02-22 19:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-28 19:26 [PATCH] perf/x86: fix event counter update issue kan.liang
2016-11-28 19:41 ` Stephane Eranian
2016-11-28 19:59 ` Liang, Kan
2016-11-28 20:18 ` Stephane Eranian
2016-11-28 20:23 ` Liang, Kan
2016-11-29 9:25 ` Peter Zijlstra
2016-11-29 14:46 ` Liang, Kan
2016-11-29 16:58 ` Peter Zijlstra
2016-11-29 17:06 ` Liang, Kan
2016-11-29 17:17 ` Peter Zijlstra
2016-11-29 17:20 ` Stephane Eranian
2016-11-29 17:30 ` Peter Zijlstra
2016-11-29 18:11 ` Stephane Eranian
2016-11-29 18:37 ` Andi Kleen
2016-11-29 19:07 ` Liang, Kan
2016-11-29 19:32 ` Peter Zijlstra
2016-11-29 20:33 ` Liang, Kan
2016-11-29 20:37 ` Stephane Eranian
2016-12-02 12:58 ` Odzioba, Lukasz
2016-12-05 10:25 ` Peter Zijlstra
2016-12-05 11:21 ` Odzioba, Lukasz
2017-02-22 14:49 ` Vince Weaver
2017-02-22 15:28 ` Liang, Kan
2017-02-22 19:18 ` Andi Kleen [this message]
2017-02-23 15:07 ` Vince Weaver
2017-02-23 16:14 ` Liang, Kan
2016-11-29 19:08 ` Odzioba, Lukasz
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