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

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Message-ID: <20181025003444.GV3109@worktop.c.hoisthospitality.com>
Date:   Thu, 25 Oct 2018 02:34:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     "Liang, Kan" <kan.liang@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/2] perf: Add munmap callback

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@...radead.org> 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.