Re: regarding [PATCH] Add libpfm4 support (v3)
From: Jiri Olsa
Date: Mon Aug 08 2011 - 09:03:34 EST
On Mon, Aug 08, 2011 at 02:25:25PM +0200, Peter Zijlstra wrote:
> On Mon, 2011-08-08 at 14:04 +0200, Jiri Olsa wrote:
> > hi,
> > any chance of getting this included?
> > http://article.gmane.org/gmane.comp.linux.perfmon2.devel/2912
> > http://article.gmane.org/gmane.comp.linux.perfmon2.devel/2912/raw
> > it needs just some little changes to fit to current tip tree
> While I don't mind extending the current way to input events I don't
> think using libpfm4 for it is desired.
> One of the ideas that has been floating about is to provide a format
> file in the sysfs representation of the pmu. This format file would
> describe the config space. The tool would parse this and use it to
> provide better input capabilities.
> This is not an easy task however, since the format syntax needs to be
> capable enough to describe all the various config muck we need to
> support, think for example of the P4 mess.
> For Intel/AMD (excluding P4) its mostly simple, with Intel having a
> slightly harder time for the offcore bits.
> As to the various arch event lists, again that is not something we need
> a whole library for, parsing those text files isn't hard. Maintaining
> the various arch event lists in a sane format is the 'hard' part and is
> something I think we should push to the vendors, because they're
> basically the only ones capable.
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