linux-kernel - Re: [PATCH RFC] mm: madvise: pageout: ignore references rather than clearing young

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Date: Sat, 24 Feb 2024 11:07:23 -0800
From: SeongJae Park <sj@...nel.org>
To: Barry Song <21cnbao@...il.com>
Cc: Minchan Kim <minchan@...nel.org>,
	sj@...nel.org,
	akpm@...ux-foundation.org,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	mhocko@...e.com,
	hannes@...xchg.org,
	Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH RFC] mm: madvise: pageout: ignore references rather than clearing young

Hi Barry,

On Sat, 24 Feb 2024 12:37:59 +0800 Barry Song <21cnbao@...il.com> wrote:

[...]
> 
> BTW，
> Hi SeongJae,
> I am not quite sure if damon also needs this, so I have kept damon as is by
> setting ignore_references = false.  MADV_PAGEOUT is an explicit hint users
> don't want the memory to be reclaimed, I don't know if it is true for damon as
> well. If you have some comments, please chime in.

Thank you for calling my name :)

For DAMON's usecase, the document simply says the behavior would be same to
MADV_PAGEOUT, so if we conclude to change MADV_PAGEOUT, I think same change
should be made for DAMON's usecase, or update DAMON document.


Thanks,
SJ

> 
> >
> > Thanks.
> 
> Thanks
> Barry