lkml.org 
[lkml]   [2013]   [Aug]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 3/3] perf, uncore: enable ev_sel_ext bit for PCU.
From
Hi,

How about:

This patch adds support for the SNB-EP PCU uncore PMU extra_sel_bit
(bit 21) which is
missing from the documentation in Table-2.75 of Intel® Xeon® Processor
E5-2600 Product Family
Uncore Performance Monitoring Guide. It is referred to later in
Table-2.81. Without this
selection bit explicitly enabled by the kernel, some events such as
COREx_TRANSITION_CYCLES do not count correctly.



On Mon, Aug 12, 2013 at 5:29 PM, Andi Kleen <ak@linux.intel.com> wrote:
> On Mon, Aug 12, 2013 at 05:16:32PM +0200, Peter Zijlstra wrote:
>> On Wed, Aug 07, 2013 at 02:17:25PM +0800, Yan, Zheng wrote:
>> > From: "Yan, Zheng" <zheng.z.yan@intel.com>
>> >
>> > PCU uncore event control register has a undocumented ev_sel_ext bit.
>> > The bit is needed by Andi's pmu-tools.
>>
>> Please provide documentation. Andi needing it isn't a good changelog (or
>> even reason).
>
> The bit is in the uncore guide, just not in the register documentation,
> but in the event descriptions.
>
> e.g. the PCU part calls it "Extra Select Bit"
>
> -Andi
>
> --
> ak@linux.intel.com -- Speaking for myself only
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-08-12 18:01    [W:0.043 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site