From: Peter Zijlstra <peterz@infradead.org>
To: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Ingo Molnar <mingo@elte.hu>, Jiri Olsa <jolsa@redhat.com>,
Lin Ming <ming.m.lin@intel.com>, rostedt <rostedt@goodmis.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH] perf, p4: Add format attributes
Date: Wed, 28 Mar 2012 00:05:05 +0200 [thread overview]
Message-ID: <1332885905.2528.3.camel@twins> (raw)
In-Reply-To: <20120327220343.GG16537@moon>
On Wed, 2012-03-28 at 02:03 +0400, Cyrill Gorcunov wrote:
> On Tue, Mar 27, 2012 at 07:12:50PM +0400, Cyrill Gorcunov wrote:
> >
> > Ah, I see thanks for the reference, Peter!
> >
> > > I've still not actually read the P4-PMU specs, so I don't know if
> > > there's anything more convenient we can do on P4. If there's a
> > > better/more useful format representation possible, don't hesitate to
> > > send a patch! :-)
> >
> > Sure, I'll try to find some time tonight to read this brand
> > new stuff. And if I find something -- will send out. At moment
> > your patch should be more than enough ;)
>
> Hi, Peter, sorry for delay,
>
> after looking some more I think ht bit might be dropped from
> the format, it's used internally by the kernel in attmept to
> eliminate redundant msr poking if new event runs on the same
> thread as previous one, and it's always cleared before real
> write to msr happens, which means user-space might set or
> clear it, but it never be considered by the kernel.
>
> (still my earlier reviewed-by is valid because this ht bit
> is harmless ;)
So does that make escr:32-62 or should that become 32-63 ?
next prev parent reply other threads:[~2012-03-27 22:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-27 14:50 [PATCH] perf, p4: Add format attributes Peter Zijlstra
2012-03-27 14:57 ` Cyrill Gorcunov
2012-03-27 15:05 ` Cyrill Gorcunov
2012-03-27 15:05 ` Peter Zijlstra
2012-03-27 15:07 ` Peter Zijlstra
2012-03-27 15:12 ` Cyrill Gorcunov
2012-03-27 22:03 ` Cyrill Gorcunov
2012-03-27 22:05 ` Peter Zijlstra [this message]
2012-03-27 22:11 ` Cyrill Gorcunov
2012-04-03 8:11 ` [tip:perf/urgent] perf/x86/p4: " tip-bot for Peter Zijlstra
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