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

[Jiri Olsa]

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..

thanks,
jirka