linux-kernel - Re: [patch v2 1/3] This patch adds support for hardware based sampling on System z processors (models z10 and up)

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Date:	Mon, 14 Feb 2011 19:57:23 +0100
From:	Robert Richter <robert.richter@....com>
To:	Heinz Graalfs <graalfs@...ux.vnet.ibm.com>
CC:	"mingo@...e.hu" <mingo@...e.hu>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"borntraeger@...ibm.com" <borntraeger@...ibm.com>,
	"schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
	"heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>,
	Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
	Maran Pakkirisamy <maranp@...ux.vnet.ibm.com>
Subject: Re: [patch v2 1/3] This patch adds support for hardware based
 sampling on System z processors (models z10 and up)

On 21.01.11 05:06:52, Heinz Graalfs wrote:
> From: Heinz Graalfs <graalfs@...ux.vnet.ibm.com>
> 
> System z's hardware sampling is described in detail in:
> 
>    SA23-2260-01 "The Load-Program-Parameter and CPU-Measurement Facilities"
> 
> The patch introduces
>  - support for System z's hardware sampler in OProfile's kernel module
>  - it adds functions that control all hardware sampling related operations as
>   - checking if hardware sampling feature is available
>     - ie: on System z models z10 and up, in LPAR mode only, and authorised during LPAR activation
>   - allocating memory for the hardware sampling feature
>   - starting/stopping hardware sampling
> 
> All functions required to start and stop hardware sampling have to be
> invoked by the oprofile kernel module as provided by the other patches of this patch set.
> 
> In case hardware based sampling cannot be setup standard timer based sampling is used by OProfile.
> 
> Signed-off-by: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
> Signed-off-by: Maran Pakkirisamy <maranp@...ux.vnet.ibm.com>
> Signed-off-by: Heinz Graalfs <graalfs@...ux.vnet.ibm.com>
> ---
>  arch/Kconfig                   |    3
>  arch/s390/Kconfig              |    1
>  arch/s390/oprofile/hwsampler.c | 1256 +++++++++++++++++++++++++++++++++++++++++
>  arch/s390/oprofile/hwsampler.h |  113 +++
>  4 files changed, 1373 insertions(+)

Applied with following changes:
    * enable compilation in Makefile

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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