linux-kernel - Re: [RFC v1] mm: add page preemption

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Message-ID: <20191023120452.GN754@dhcp22.suse.cz>
Date:   Wed, 23 Oct 2019 14:04:52 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Hillf Danton <hdanton@...a.com>
Cc:     linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Jan Kara <jack@...e.cz>
Subject: Re: [RFC v1] mm: add page preemption

On Wed 23-10-19 19:53:50, Hillf Danton wrote:
> 
> On Wed, 23 Oct 2019 10:17:29 +0200 Michal Hocko wrote:
[...]
> > This doesn't really answer my question.
> > Why cannot you use memcgs as they are now.
> 
> No prio provided.
> 
> > Why exactly do you need a fixed priority?
> 
> Prio comparison in global reclaim is what was added. Because every task has
> prio makes that comparison possible.

That still doesn't answer the question because it doesn't explain why is
the priority really necessary. I am sorry but I have more important
things to deal with than asking the same question again and again.
-- 
Michal Hocko
SUSE Labs