Subject: Re: [PATCH] getrusage sucks
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Claudio Scordino <cloud.of.andor@gmail.com>
Cc: "Magnus Naeslund(f)" <mag@fbab.net>,
       "Hua Zhong (hzhong)" <hzhong@cisco.com>, linux-kernel@vger.kernel.org,
       kernelnewbies@nl.linux.org
In-Reply-To: <200511110211.05642.cloud.of.andor@gmail.com>
References: <75D9B5F4E50C8B4BB27622BD06C2B82BCF2FD4@xmb-sjc-235.amer.cisco.com>
	 <200511110123.29664.cloud.of.andor@gmail.com> <4373E69B.6040206@fbab.net>
	 <200511110211.05642.cloud.of.andor@gmail.com>
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Date: Fri, 11 Nov 2005 13:30:16 +0000
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On Gwe, 2005-11-11 at 02:11 +0100, Claudio Scordino wrote:
> > You need to wrap this with a read_lock(&tasklist_lock) to be safe, I think.
> 
> Right. Probably this was the meaning also of Hua's mail. Sorry, but I didn't 
> get it immediately.
> 
> So, what if I do as follows ? Do you see any problem with this solution ?

It will depend on the data accuracy. If the information on cpu usage is
very accurate then it becomes a way to analyse what is happening to
tasks you don't own - such as say cryptographic functions in the web
server...

Otherwise, or with an owner check I see no real problem with the concept

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