linux-kernel - Re: [PATCH] mm: mark folio as workingset in lru_deactivate

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Message-ID: <ZCVXFLA+sarzGG18@cmpxchg.org>
Date:   Thu, 30 Mar 2023 05:32:04 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Zhaoyang Huang <huangzhaoyang@...il.com>
Cc:     "zhaoyang.huang" <zhaoyang.huang@...soc.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, ke.wang@...soc.com
Subject: Re: [PATCH] mm: mark folio as workingset in lru_deactivate_fn

On Thu, Mar 30, 2023 at 09:38:48AM +0800, Zhaoyang Huang wrote:
> On Wed, Mar 29, 2023 at 10:55 PM Johannes Weiner <hannes@...xchg.org> wrote:
> >
> > On Wed, Mar 29, 2023 at 06:47:35PM +0800, zhaoyang.huang wrote:
> > > From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
> > >
> > > folio will skip of being set as workingset in lru_deactivate_fn.
> >
> > Can you please elaborate why that's undesirable? What's the problem
> > you're fixing?
> If I am correct, folio will skip being set as workingset when moving
> from active lru to inactive lru, which is performed on every folio in
> shrink_active_list during normal reclaim.

shrink_active_list directly calls folio_set_workingset(). The function
you're editing is used for things like MADV_COLD and truncate().

It sounds like there is just a misunderstanding of the code, not an
actual problem.