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 10:45:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     William Cohen <wcohen@...hat.com>, 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
Subject: Re: [PATCH v4] Use more flexible pattern matching for CPU
 identification for mapfile.csv

Em Tue, Dec 05, 2017 at 09:25:56AM +0530, Ravi Bangoria escreveu:
> 
> 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, added to the commit.

- Arnaldo