linux-kernel - Re: 2.6.33 pagemap endless read loop

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Message-ID: <20100112162823.GC7363@basil.fritz.box>
Date:	Tue, 12 Jan 2010 17:28:24 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.33 pagemap endless read loop

> Hmm, could you please try:
> 
>      time cat /proc/self/pagemap >/dev/null
> 

I stopped it after a minute of CPU time...

Obviously reading 47bits of zeroes take a long time.

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