linux-kernel - Re: [RFC] mm: Proactive compaction

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Message-ID: <ca33d8ea-71a4-282e-4d0f-6d06a30d3ecd@oracle.com>
Date:   Sat, 24 Aug 2019 01:24:50 -0600
From:   Khalid Aziz <khalid.aziz@...cle.com>
To:     Vlastimil Babka <vbabka@...e.cz>, Nitin Gupta <nigupta@...dia.com>,
        akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        mhocko@...e.com, dan.j.williams@...el.com
Cc:     Yu Zhao <yuzhao@...gle.com>, Matthew Wilcox <willy@...radead.org>,
        Qian Cai <cai@....pw>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Roman Gushchin <guro@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Arun KS <arunks@...eaurora.org>,
        Janne Huttunen <janne.huttunen@...ia.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC] mm: Proactive compaction

On 8/20/19 2:46 AM, Vlastimil Babka wrote:
> +CC Khalid Aziz who proposed a different approach:
> https://lore.kernel.org/linux-mm/20190813014012.30232-1-khalid.aziz@oracle.com/T/#u
> 
> On 8/16/19 11:43 PM, Nitin Gupta wrote:
>> The patch has plenty of rough edges but posting it early to see if I'm
>> going in the right direction and to get some early feedback.
> 
> That's a lot of control knobs - how is an admin supposed to tune them to their
> needs?
> 

At a high level, this idea makes sense and is similar to the idea of
watermarks for free pages. My concern is the same. We now have more
knobs to tune and that increases complexity for sys admins as well as
the chances of a misconfigured system.

--
Khalid