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

[Robert Richter <robert.richter@amd.com>]

On 21.01.11 05:06:52, Heinz Graalfs wrote:
> From: Heinz Graalfs <graalfs@linux.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@linux.vnet.ibm.com>
> Signed-off-by: Maran Pakkirisamy <maranp@linux.vnet.ibm.com>
> Signed-off-by: Heinz Graalfs <graalfs@linux.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

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Advanced Micro Devices, Inc.
Operating System Research Center