linux-kernel - Re: [PATCH 1/2] mm/damon/sysfs: Implement recording feature

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Date: Mon,  5 Feb 2024 18:56:59 -0800
From: SeongJae Park <sj@...nel.org>
To: cuiyangpei <cuiyangpei@...il.com>
Cc: SeongJae Park <sj@...nel.org>,
	akpm@...ux-foundation.org,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	xiongping1@...omi.com
Subject: Re: [PATCH 1/2] mm/damon/sysfs: Implement recording feature

Hi Cuiyangpei,

On Mon, 29 Jan 2024 20:13:16 +0800 cuiyangpei <cuiyangpei@...il.com> wrote:

> On Sun, Jan 28, 2024 at 08:28:04AM -0800, SeongJae Park wrote:
> > On Sun, 28 Jan 2024 17:13:00 +0800 cuiyangpei <cuiyangpei@...il.com> wrote:
> > 
> > > On Fri, Jan 26, 2024 at 12:04:54AM -0800, SeongJae Park wrote:
> > [...]
> > > > So, 'update_schemes_tried_regions' command is firstly handled by
> > > > 'damon_sysfs_cmd_request_callback()', which is registered as
> > > > after_wmarks_check() and after_aggregation() callback.  Hence
> > > > 'update_schemes_tried_regions' command is still effectively working in
> > > > aggregation interval granularity.  I think this is what you found, right?
> > > > 
> > > Yes.
> > > > If I'm not wrongly understanding your point, I think the concern is valid.  I
> > > > think we should make it works in sampling interval granularity.  I will try to
> > > > make so.  Would that work for your use case?
> > > > 
> > > It's much better than working in aggregation interval.
> > 
> > Thank you for confirming.  I will start working on this.
> > 
> 
> Great, looking forward to seeing the progress.

Just sent a patch[1] for this.

I also updated DAMON user-space tool, damo, to use this improvement[2].  I hope
that to help others who using DAMON with their own tool to easily understand
how they can get the improvement from this patch.

Also, please feel free to ask any questions and/or help.

[1] https://lore.kernel.org/r/20240206025158.203097-1-sj@kernel.org
[2] https://github.com/awslabs/damo/commit/75af3a1c0b3e79cd3207f0f8df5b5ac39f887450


Thanks,
SJ

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