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

From: KAMEZAWA Hiroyuki
Date: Fri Aug 28 2009 - 10:29:20 EST

Balbir Singh wrote:
> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> [2009-08-28
> 16:35:23]:

>> Current soft-limit RB-tree will be easily broken i.e. not-sorted
>> correctly
>> if used under use_hierarchy=1.
> Not true, I think the sorted-ness is delayed and is seen when we pick
> a tree for reclaim. Think of it as being lazy :)
plz explain how enexpectedly unsorted RB-tree can work sanely.

>> My patch disallows set softlimit to Bob and Mike, just allows against
>> Gold
>> because there can be considered as the same class, hierarchy.
> 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.


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