linux-kernel - Re: [PATCH 2/5] perf: generic intel uncore support

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Message-ID: <4F7AB4AC.1060108@intel.com>
Date:	Tue, 03 Apr 2012 16:28:28 +0800
From:	"Yan, Zheng" <zheng.z.yan@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	mingo@...e.hu, andi@...stfloor.org, eranian@...gle.com,
	linux-kernel@...r.kernel.org, ming.m.lin@...el.com
Subject: Re: [PATCH 2/5] perf: generic intel uncore support

On 04/03/2012 06:11 AM, Peter Zijlstra wrote:
> On Sun, 2012-04-01 at 11:11 +0800, Yan, Zheng wrote:
>>
>> Because using per-cpu allocation is inconvenience for PCI uncore device.
> 
> What are those, where does one read about them and why?
> 
PCI uncore device support was added by patch 4. If using per-cpu pointer,
we have to setup the per-cpu pointer after the PCI driver's probe function
recognizes the uncore device. It means we have to first add the PCI uncore
device to a list, then call a function on all cpus to scan the list, find
the right uncore device and setup the per-cpu pointer.

Regards
Yan, Zheng
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