Hi, On Fri, Jun 15, 2018 at 1:12 AM Peter Zijlstra <pet...@infradead.org> wrote: > > On Fri, Jun 15, 2018 at 04:01:45PM +0800, Jin, Yao wrote: > > > Bring more overhead to kernel if we zero the bits considering the number of > > leaked samples may be not too small? > > Keeping the samples at least allows you to know how many samples > happened and such things. > Yes, important point. You cannot just drop a sample. It may break some calculations done like num_samples x fixed_periods = total number of events observed. Some tools do this.
> > And the skid information may be interesting (see example of hitting on > > page_fault in previous mail). If we zero it, we will not know. > > If you throw them out the window you also don't know, do you?
