On Tue, Oct 13, 2015 at 6:40 AM, Ingo Molnar wrote:
>
>
> * Stephane Eranian wrote:
>
> > This patch enables the suport for the PERF_SAMPLE_BRANCH_CALL
> > for Intel x86 processors. When the processor support LBR filtering
> > this the selection is done in hardware. Otherwise, the filter is
> > a
> I'm wondering how frequent zero-length calls are. If they still occur in
> typical
> user-space, would it make sense to also have a separate branch sampling type
> for
> zero length calls?
Apparently not too old icc compiled 32bit PIC binaries still contain it.
For gcc it was fixed for much
* Stephane Eranian wrote:
> This patch enables the suport for the PERF_SAMPLE_BRANCH_CALL
> for Intel x86 processors. When the processor support LBR filtering
> this the selection is done in hardware. Otherwise, the filter is
> applied by software. Note that we chose to include zero length calls
This patch enables the suport for the PERF_SAMPLE_BRANCH_CALL
for Intel x86 processors. When the processor support LBR filtering
this the selection is done in hardware. Otherwise, the filter is
applied by software. Note that we chose to include zero length calls
because they also represent calls.
4 matches
Mail list logo
