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SubjectRe: [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

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