linux-kernel - Re: [RFC][PATCH 1/7][memcg] virtually indexed array library.

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Message-Id: <20100729132703.2d53e8a4.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 29 Jul 2010 13:27:03 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	gthelen@...gle.com, m-ikeda@...jp.nec.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/7][memcg] virtually indexed array library.

On Thu, 29 Jul 2010 09:32:26 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Wed, 28 Jul 2010 12:45:13 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
 
> > My gut reaction to this sort of thing is "run away in terror".  It
> > encourages kernel developers to operate like lackadaisical userspace
> > developers and to assume that underlying code can perform heroic and
> > immortal feats.  But it can't.  This is the kernel and the kernel is a
> > tough and hostile place and callers should be careful and defensive and
> > take great efforts to minimise the strain they put upon other systems.
> > 
> > IOW, can we avoid doing this?
> > 
> 

I'll use pre-allocated pointer array in the next version. It's simple even
if a bit slow.

==
struct mem_cgroup *mem_cgroups[CONFIG_MAX_MEM_CGROUPS] __read_mostly;
#define id_to_memcg(id)		mem_cgroups[id];
==
But this can use hugepage-mapping-for-kernel...so, can be quick.

Thanks,
-Kame



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