linux-kernel - Re: [PATCH 5/5] mm/vmscan: fix misleading comment in isolate_lru

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Date:   Tue, 13 Jul 2021 11:32:29 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, hannes@...xchg.org, vbabka@...e.cz,
        axboe@...nel.dk, iamjoonsoo.kim@....com, alexs@...nel.org,
        apopple@...dia.com, willy@...radead.org, minchan@...nel.org,
        david@...hat.com, shli@...com, hillf.zj@...baba-inc.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] mm/vmscan: fix misleading comment in
 isolate_lru_pages()

On Mon 12-07-21 19:16:47, Miaohe Lin wrote:
> On 2021/7/12 15:28, Michal Hocko wrote:
> > On Sat 10-07-21 18:03:29, Miaohe Lin wrote:
> >> We couldn't know whether the page is being freed elsewhere until we failed
> >> to increase the page count.
> > 
> > This is moving a hard to understand comment from one place to another.
> 
> If get_page_unless_zero failed, the page could have been freed elsewhere. I think
> this looks straightforward but doesn't help a lot. Are you preferring to just
> remove this comment ?

Yes the comment in its current form is not really helpful much. Does it
deserve a single liner to drop it? Likely not on its own without more
changes in that area.
-- 
Michal Hocko
SUSE Labs