linux-kernel - Re: [PATCH 4/4] perf, tools, script: Add brstackasm output for branch stacks

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Message-ID: <20170109191451.GC8388@tassilo.jf.intel.com>
Date:   Mon, 9 Jan 2017 11:14:51 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <andi@...stfloor.org>, acme@...nel.org,
        jolsa@...nel.org, mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] perf, tools, script: Add brstackasm output for
 branch stacks

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