linux-kernel - Re: Re: [PATCH 0/8] Introduce Data Access MONitor (DAMON)

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Date:   Mon, 20 Jan 2020 19:14:40 +0100
From:   SeongJae Park <sj38.park@...il.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     SeongJae Park <sjpark@...zon.com>, akpm@...ux-foundation.org,
        SeongJae Park <sjpark@...zon.de>, acme@...nel.org,
        brendan.d.gregg@...il.com, corbet@....net, mgorman@...e.de,
        dwmw@...zon.com, amit@...nel.org, rostedt@...dmis.org,
        sj38.park@...il.com, linux-mm@...ck.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH 0/8] Introduce Data Access MONitor (DAMON)

On Mon, 20 Jan 2020 19:55:51 +0300 "Kirill A. Shutemov" <kirill@...temov.name> wrote:

> On Mon, Jan 20, 2020 at 05:27:49PM +0100, SeongJae Park wrote:
> > This patchset introduces a new kernel module for practical monitoring of
> > data accesses, namely DAMON.
> 
> Looks like it's not integrated with perf at all right? Why?
> Correlating measurements from different domains would help to see the
> bigger picture.

Right, it's not integrated with perf.  DAMON provides only its debugfs
interface.  Also I agree that correlating measurments will be helpful.  I do
not integrate DAMON with perf with this patchset for following reasons.

First of all, I think I have no deep understanding of perf, yet.  Partly for
the reason, I couldn't figure out the best way to integrate DAMON with perf.
Especially, I couldn't straightforwardly classify DAMON providing information
into one of the categories of the perf events I know.

Therefore, rather than integrating DAMON with perf in my arguable way and
increasing the complexity of the code, I decided to keep the interface as
simple and flexible as it can be for the first stage.  That said, I believe it
would be not too hard to integrate DAMON with perf in a future.

Thanks,
SeongJae Park

> 
> -- 
>  Kirill A. Shutemov
> 
>