linux-kernel - Re: [patch 1/6] procfs: Introduce sequential fdinfo engine

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Message-ID: <CACVxJT8vuh+Jm1LYhiQBLvi6TASpGgKm0CCqVS=g3QE+eHK7Wg@mail.gmail.com>
Date:	Thu, 31 Oct 2013 13:32:13 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrey Vagin <avagin@...nvz.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	James Bottomley <jbottomley@...allels.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Matthew Helsley <matt.helsley@...il.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Tvrtko Ursulin <tvrtko.ursulin@...lan.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 1/6] procfs: Introduce sequential fdinfo engine

On Wed, Oct 30, 2013 at 10:59 PM, Cyrill Gorcunov <gorcunov@...nvz.org> wrote:
> At moment the fdinfo operations (ie the output from /proc/$pid/fdinfo/$fd)
> are generating output in one pass, which makes useless memory pressue
> if the reader/user provides a buffer with a small size.

cat(1) uses 64 KB buffer.
The output doesn't exceed one page anyway.
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