linux-kernel - Re: [PATCH] [23/31] HWPOISON: add memory cgroup filter

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Message-ID: <87tyvtyawl.fsf@basil.nowhere.org>
Date:	Mon, 14 Dec 2009 13:53:30 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"kamezawa.hiroyu@...fujitsu.com" <kamezawa.hiroyu@...fujitsu.com>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"Li, Haicheng" <haicheng.li@...el.com>
Subject: Re: [PATCH] [23/31] HWPOISON: add memory cgroup filter

Wu Fengguang <fengguang.wu@...el.com> writes:
>
> We could keep an fd open on the desired cgroup, in user space: 
>
>         #!/bin/bash
>
>         mkdir /cgroup/hwpoison && \
>         exec 9<>/cgroup/hwpoison/tasks || exit 1
>
> A bit simpler than an in-kernel fget_light() or CSS refcount :)

FYI, I decided to not do any of this in .33, but just keep the 
ugly-but-working inode hack. We can look at fixing that for .34.
These interfaces are debugfs, so can be changed.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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