linux-kernel - Re: [PATCH V2] nommu: add anonymous page memcg accounting

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Message-ID: <WC20101021023516.32042E@digidescorp.com>
Date:	Wed, 20 Oct 2010 21:35:16 -0500
From:	"Steve Magnani" <steve@...idescorp.com>
To:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Cc:	balbir@...ux.vnet.ibm.com, linux-mm@...ck.org, dhowells@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] nommu: add anonymous page memcg accounting

On Thu, 2010-10-21 at 09:08 +0900, KAMEZAWA Hiroyuki wrote:
> I myself can't maintain NOMMU kernel. So, please test every -rc1 when
> this patch merged. OK ?

It's reasonable to ask that features be tested every so often, and since the memory cgroup code seems to be 
changing relatively frequently it probably needs exercising more often. I can't commit to this, though - I 
don't know how much longer I'll be working with NOMMU kernels, and they are notoriously fragile. Any memory 
access bug that would cause an oops (or SEGV) in a "normal" kernel can cause subtle and almost impossible to 
debug behavior on a NOMMU system. For this reason I always try to work with "stable" kernels (recent threads 
debating the term notwithstanding)...so it would be a pretty far jump to a -rc1 kernel.

Is this a showstopper (in which case David's patch to make the CGROUP_MEM_RES_CTLR Kconfig option depend on MMU 
should be implemented), or should I post V3 of the patch that has Balbir's suggested change? 

Steve

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