linux-kernel - Re: [PATCH v4] Use more flexible pattern matching for CPU identification for mapfile.csv

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Date:   Tue, 5 Dec 2017 09:25:56 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     William Cohen <wcohen@...hat.com>, acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com, mpetlan@...hat.com,
        linux-kernel@...r.kernel.org, shriyak@...ux.vnet.ibm.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4] Use more flexible pattern matching for CPU
 identification for mapfile.csv


On 12/04/2017 08:27 PM, William Cohen wrote:
> The powerpc cpuid information includes chip revision information.
> Changes between chip revisions are usually minor bug fixes and usually
> do not affect the operation of the performance monitoring hardware.
> The original mapfile.csv matching requires enumerating every possible
> cpuid string.  When a new minor chip revision is produced a new entry
> has to be added to the mapfile.csv and the code recompiled to allow
> perf to have the implementation specific perf events for this new
> minor revision.  For users of various distibutions of Linux having to
> wait for a new release of the kernel's perf tool to be built with
> these trivial patches is inconvenient.
>

Tested-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>

Thanks,
Ravi