Re: [PATCH v1 0/2] perf: Drop leaked kernel samples

From: Jin, Yao
Date: Fri Jun 15 2018 - 04:24:58 EST

On 6/15/2018 4:12 PM, Peter Zijlstra 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.

Yeah, agree, but a little bit overhead ...

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?

Yes, default I can't know that window. I have to use sysctl to enable.

Jin Yao