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

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  Re: [PATCH 4/4] perf, tools, script: Add brstackasm output for  branch stacks Jiri Olsa <jolsa@redhat.com> - 2017-01-08 15:30 +0100
    Re: [PATCH 4/4] perf, tools, script: Add brstackasm output for  branch stacks Andi Kleen <ak@linux.intel.com> - 2017-01-09 20:20 +0100

#1553880 — Re: [PATCH 4/4] perf, tools, script: Add brstackasm output for branch stacks

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

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#1554624

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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