linux-kernel - Re: [PATCH 3/6] memcg: charge-commit-cancel protocl

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Message-Id: <20081004002530.776d4592.d-nishimura@mtf.biglobe.ne.jp>
Date:	Sat, 4 Oct 2008 00:25:30 +0900
From:	Daisuke Nishimura <d-nishimura@....biglobe.ne.jp>
To:	kamezawa.hiroyu@...fujitsu.com
Cc:	d-nishimura@....biglobe.ne.jp,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	balbir@...ux.vnet.ibm.com
Subject: Re: [PATCH 3/6] memcg: charge-commit-cancel protocl

On Sat, 4 Oct 2008 00:15:17 +0900 (JST)
kamezawa.hiroyu@...fujitsu.com wrote:

> ----- Original Message -----
> >> precharge/commit/cancel can be used for other places,
> >>  - shmem, (and other places need precharge.)
> >>  - move_account(force_empty) etc...
> >> we'll revisit later.
> >> 
> >> Changelog v5 -> v6:
> >>  - added newpage_charge() and migrate_fixup().
> >>  - renamed  functions for swap-in from "swap" to "swapin"
> >>  - add more precise description.
> >> 
> >
> >I don't have any objection to this direction now, but I have one quiestion.
> >
> >Does mem_cgroup_charge_migrate_fixup need to charge a newpage,
> >while mem_cgroup_prepare_migration has charged it already?
> In migration-is-failed case, we have to charge *old page* here.
> 
Ah... you are right.
Sorry for noise.


Daisuke Nishimura.

> >
> >I agree adding I/F would be good for future, but I think
> >mem_cgroup_charge_migration_fixup can be no-op function for now.
> >
> Hmm, handling failure case in explicit way may be better. Ok,
> I'll try some.
> 
> Thanks,
> -Kame
> 
> 
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