linux-kernel - Re: WTH is going on with memory hotplug sysf interface (was: Re: [RFC PATCH] mm, hotplug: get rid of auto_online

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Message-Id: <20170313145815.uba3ij5seq6mrhow@arbab-laptop>
Date:   Mon, 13 Mar 2017 09:58:16 -0500
From:   Reza Arbab <arbab@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Igor Mammedov <imammedo@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        David Rientjes <rientjes@...gle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        linux-api@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-s390@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-acpi@...r.kernel.org, qiuxishi@...wei.com,
        toshi.kani@....com, xieyisheng1@...wei.com, slaoub@...il.com,
        iamjoonsoo.kim@....com, vbabka@...e.cz,
        Zhang Zhen <zhenzhang.zhang@...wei.com>,
        Yasuaki Ishimatsu <yasu.isimatu@...il.com>,
        Tang Chen <tangchen@...fujitsu.com>
Subject: Re: WTH is going on with memory hotplug sysf interface (was: Re:
 [RFC PATCH] mm, hotplug: get rid of auto_online_blocks)

On Mon, Mar 13, 2017 at 10:21:45AM +0100, Michal Hocko wrote:
>> I agree with your general sentiment that this stuff is very 
>> nonintuitive.
>
>My criterion for nonintuitive is probably different because I would 
>call this _completely_unusable_. Sorry for being so loud about this but 
>the more I look into this area the more WTF code I see. This has seen 
>close to zero review and seems to be building up more single usecase 
>code on top of previous. We need to change this, seriously!

No argument here. I'm happy to help however I can.

-- 
Reza Arbab