From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: "Yan, Zheng" <zheng.z.yan@intel.com>
Cc: mingo@elte.hu, andi@firstfloor.org, eranian@google.com,
linux-kernel@vger.kernel.org, ming.m.lin@intel.com
Subject: Re: [PATCH 2/5] perf: generic intel uncore support
Date: Tue, 03 Apr 2012 00:16:48 +0200 [thread overview]
Message-ID: <1333405008.2960.84.camel@laptop> (raw)
In-Reply-To: <4F77C75B.4060105@intel.com>
On Sun, 2012-04-01 at 11:11 +0800, Yan, Zheng wrote:
> > So what's up with all this box->lock business.. why does that lock
> > exist?
>
> If user doesn't provide the "-C x" option to the perf tool, multiple cpus
> will try adding/deleting events at the same time.
Right, however:
> > Aside from all this, there's still the problem that you don't place all
> > events for a particular phys_id onto a single cpu. It doesn't matter
> > which cpu in that package it is, but all events should go to the same.
> >
> > This means that on unplug of that cpu, you have to migrate all these
> > events etc..
>
> Any hints how to do this. I'm afraid it requires big changes to perf core.
Yes it'll need some core changes, but I don't think I'll be too bad,
I'll try and write up something soonish..
next prev parent reply other threads:[~2012-04-02 22:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-28 6:43 [RFC PATCH 0/5] perf: Intel uncore pmu counting support Yan, Zheng
2012-03-28 6:43 ` [PATCH 1/5] perf: Export perf_assign_events Yan, Zheng
2012-03-28 6:43 ` [PATCH 2/5] perf: generic intel uncore support Yan, Zheng
2012-03-28 9:24 ` Andi Kleen
2012-03-28 9:38 ` Peter Zijlstra
2012-03-28 11:24 ` Yan, Zheng
2012-03-31 3:18 ` Peter Zijlstra
2012-04-01 3:11 ` Yan, Zheng
2012-04-02 22:10 ` Peter Zijlstra
2012-04-02 22:11 ` Peter Zijlstra
2012-04-03 8:28 ` Yan, Zheng
2012-04-03 14:29 ` Peter Zijlstra
2012-04-04 1:47 ` Yan, Zheng
2012-04-10 0:48 ` Yan, Zheng
2012-04-16 12:11 ` Peter Zijlstra
2012-04-02 22:16 ` Peter Zijlstra [this message]
2012-04-02 22:24 ` Peter Zijlstra
2012-04-16 12:07 ` Peter Zijlstra
2012-04-17 6:56 ` Yan, Zheng
2012-03-28 6:43 ` [PATCH 3/5] perf: Add Nehalem and Sandy Bridge " Yan, Zheng
2012-03-28 6:43 ` [PATCH 4/5] perf: Generic pci uncore device support Yan, Zheng
2012-03-28 6:43 ` [PATCH 5/5] perf: Add Sandy Bridge-EP uncore support Yan, Zheng
2012-03-28 6:49 ` [RFC PATCH 0/5] perf: Intel uncore pmu counting support Ingo Molnar
2012-03-28 8:49 ` Peter Zijlstra
2012-03-28 9:02 ` Yan, Zheng
2012-03-28 8:57 ` Andi Kleen
2012-03-28 9:30 ` Ingo Molnar
2012-03-28 10:58 ` Peter Zijlstra
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