linux-kernel - Re: /proc/stat vs. failed order-4 allocation

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Message-ID: <20140521143229.GA32011@infradead.org>
Date:	Wed, 21 May 2014 07:32:29 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Righi <andrea@...terlinux.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Thorsten Diehl <thorsten.diehl@...ibm.com>
Subject: Re: /proc/stat vs. failed order-4 allocation

On Wed, May 21, 2014 at 02:25:21PM +0200, Heiko Carstens wrote:
> Hi all,
> 
> I'm just wondering why /proc/stat is a single_open() seq_file and not a
> regular seq_file with an iterator (say 48 online cpus for each iteration
> or something similar).

Probably because no one sent a patch for it. I'm pretty sure it used the
even more horrible old proc ops before and was converted in batch with
various other files.
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