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Date: Mon, 9 Jan 2017 11:14:51 -0800
From: Andi Kleen <ak@linux.intel.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>, acme@kernel.org, jolsa@kernel.org,
        mingo@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/4] perf, tools, script: Add brstackasm output for
 branch stacks
Message-ID: <20170109191451.GC8388@tassilo.jf.intel.com>
References: <20170103090029.17621-1-andi@firstfloor.org>
 <20170103090029.17621-5-andi@firstfloor.org>
 <20170108141949.GA31186@krava>
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On Sun, Jan 08, 2017 at 03:19:49PM +0100, Jiri Olsa wrote:
> On Tue, Jan 03, 2017 at 01:00:29AM -0800, Andi Kleen wrote:
> 
> SNIP
> 
> > +		len = grab_bb(buffer, start, end,
> > +				machine, thread, &x.is64bit,
> > +				&x.cpumode);
> > +		/* Patch up missing kernel transfers due to ring filters */
> 
> could you please provide more details on those ring filters? never heard of..

This is the LBR filter exposed with the -j option (-j user or -j kernel) 

-Andi