Re: [PATCH 1/2] perf: Add munmap callback

From: Peter Zijlstra
Date: Wed Oct 24 2018 - 20:34:54 EST

On Wed, Oct 24, 2018 at 05:25:59PM -0700, Stephane Eranian wrote:
> On Wed, Oct 24, 2018 at 5:23 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> > That is actually a different problem. And you're right, we never did fix
> > that.
> >
> it is a different problem but the solution is the same: PERF_RECORD_UNMAP!

But he's not actually doing PERF_RECORD_UNMAP, nor is his perf_munmap()
hook sufficient to actually generate those.

Now I agree that if he's going to do an munmap hook, he should do it
'right' and at the very least allow for PERF_RECORD_UNMAP to be done,
but ideally simply pick up and finish that patch we had back then.