linux-kernel - Re: [PATCH] perf_events: AMD event scheduling (v3)

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Message-ID: <20100210160958.GK24679@erda.amd.com>
Date:	Wed, 10 Feb 2010 17:09:58 +0100
From:	Robert Richter <robert.richter@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	eranian@...gle.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com
Subject: Re: [PATCH]  perf_events: AMD event scheduling (v3)

On 10.02.10 12:59:26, Peter Zijlstra wrote:
> On Mon, 2010-02-08 at 17:17 +0200, Stephane Eranian wrote:
> >         This patch adds correct AMD Northbridge event scheduling.
> >         It must be applied on top tip-x86 + hw_perf_enable() fix.
> > 
> >         NB events are events measuring L3 cache, Hypertransport
> >         traffic. They are identified by an event code  >= 0xe0.
> >         They measure events on the Northbride which is shared
> >         by all cores on a package. NB events are counted on a
> >         shared set of counters. When a NB event is programmed
> >         in a counter, the data actually comes from a shared
> >         counter. Thus, access to those counters needs to be
> >         synchronized.
> > 
> >         We implement the synchronization such that no two cores
> >         can be measuring NB events using the same counters. Thus,
> >         we maintain a per-NB * allocation table. The available slot
> >         is propagated using the event_constraint structure.
> > 
> >         The 2nd version takes into account the changes on how
> >         constraints are stored by the scheduling code.
> > 
> >         The 3rd version fixes formatting issues, code readability
> >         and one bug in amd_put_event_constraints().
> > 
> >         Signed-off-by: Stephane Eranian <eranian@...gle.com>
> 
> OK, took this with the below merged in.

Peter,

will this go to tip/perf/core? Or is there another tree?

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com

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