linux-kernel - Re: [RFC][PATCH 1/5] memcg: change for softlimit.

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Message-ID: <712c0209222358d9c7d1e33f93e21c30.squirrel@webmail-b.css.fujitsu.com>
Date:	Fri, 28 Aug 2009 23:40:56 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Cc:	balbir@...ux.vnet.ibm.com,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [RFC][PATCH 1/5] memcg: change for softlimit.

KAMEZAWA Hiroyuki wrote:
> Balbir Singh wrote:
>> But Bob and Mike might need to set soft limits between themselves. if
>> soft limit of gold is 1G and bob needs to be close to 750M and mike
>> 250M, how do we do it without supporting what we have today?
>>
> Don't use hierarchy or don't use softlimit.
> (I never think fine-grain  soft limit can be useful.)
>
> Anyway, I have to modify unnecessary hacks for res_counter of softlimit.
> plz allow modification. that's bad.
> I postpone RB-tree breakage problem, plz explain it or fix it by yourself.
>
I changed my mind....per-zone RB-tree is also broken ;)

Why I don't like broken system is a function which a user can't
know/calculate how-it-works is of no use in mission critical systems.

I'd like to think how-to-fix it with better algorithm. Maybe RB-tree
is not a choice.

Thanks,
-Kame

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