linux-kernel - Re: [PATCH v2 1/5] mm: introduce MADV

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Date:   Thu, 20 Jun 2019 17:44:06 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-api@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Tim Murray <timmurray@...gle.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Daniel Colascione <dancol@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Sonny Rao <sonnyrao@...gle.com>,
        Brian Geffon <bgeffon@...gle.com>, jannh@...gle.com,
        oleg@...hat.com, christian@...uner.io, oleksandr@...hat.com,
        hdanton@...a.com, lizeb@...gle.com
Subject: Re: [PATCH v2 1/5] mm: introduce MADV_COLD

On Thu, Jun 20, 2019 at 09:08:54AM +0200, Michal Hocko wrote:
> On Thu 20-06-19 09:06:51, Minchan Kim wrote:
> > On Wed, Jun 19, 2019 at 02:56:12PM +0200, Michal Hocko wrote:
> [...]
> > > Why cannot we reuse a large part of that code and differ essentially on
> > > the reclaim target check and action? Have you considered to consolidate
> > > the code to share as much as possible? Maybe that is easier said than
> > > done because the devil is always in details...
> > 
> > Yub, it was not pretty when I tried. Please see last patch in this
> > patchset.
> 
> That is bad because this code is quite subtle - especially the THP part
> of it. I will be staring at the code some more. Maybe some
> simplification pops out.

Yeah, I couldn't come up with better idea. Actually, I wanted to be
left. More suggestion to make simple/readable would be great.