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

[Andi Kleen]

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