From mboxrd@z Thu Jan  1 00:00:00 1970
From: yamamoto-jCdQPDEk3idL9jVzuh4AOg@public.gmane.org (YAMAMOTO Takashi)
Subject: Re: [RFD][PATCH] memcg: Move Usage at Task Move
Date: Wed, 11 Jun 2008 12:44:46 +0900 (JST)
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> I'm now considering following logic. How do you think ?
> 
> Assume: move TASK from group:CURR to group:DEST.
> 
> == move_task(TASK, CURR, DEST)
> 
> if (DEST's limit is unlimited)
> 	moving TASK
> 	return success.
> 
> usage = check_usage_of_task(TASK).
> 
> /* try to reserve enough room in destionation */
> if (try_to_reserve_enough_room(DEST, usage)) {
> 	move TASK to DEST and move pages AMAP.
> 	/* usage_of_task(TASK) can be changed while we do this.
> 	   Then, we move AMAP. */
> 	return success;
> }
> return failure.
> ==

AMAP means that you might leave some random charges in CURR?

i think that you can redirect new charges in TASK to DEST
so that usage_of_task(TASK) will not grow.

YAMAMOTO Takashi