linux-kernel - Re: [patch/rfc] perf on raspberry-pi without overflow interrupt

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Message-ID: <20140224104634.GA2553@mudshark.cambridge.arm.com>
Date:	Mon, 24 Feb 2014 10:46:35 +0000
From:	Will Deacon <will.deacon@....com>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Chad Paradis <chad.paradis@...t.maine.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Stephane Eranian <eranian@...il.com>
Subject: Re: [patch/rfc] perf on raspberry-pi without overflow interrupt

Hi Vince,

On Fri, Jan 17, 2014 at 05:45:04AM +0000, Vince Weaver wrote:
> On Thu, 16 Jan 2014, Peter Zijlstra wrote:
> 
> > Yeah I suppose we could do something like that. Maybe something like:
> > 
> > # cat /sys/bus/event_source/devices/cpu/flags
> > int precise filter
> 
> wouldn't that violate the "one value per file" rule?
> 
> I guess we could also stick it in the mmap page somewhere, as tools like 
> PAPI already have to check there for things like rdpmc support.
> 
> 
> Anyway, here's a first pass at a generic fix for this issue.  I'm sure the 
> code is pretty horrible, I don't usually mess with the perf code at this 
> level.  I haven't tested yet as it touched enough files that the rasp-pi 
> is going to take a few hours to finish compiling.
> 
> Am I on the right track, or totally off here?

Where did we get to with this? If the generic changes are going to take some
time, I'm happy to take a temporary (non-invasive) fix in the ARM backend while
you sort out the core.

Will
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