linux-kernel - Re: [PATCH] fix race in AF

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Message-ID: <20070618103241.GX521@postel.suug.ch>
Date:	Mon, 18 Jun 2007 12:32:41 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	davem@...emloft.net, akpm@...ux-foundation.org,
	viro@....linux.org.uk, alan@...rguk.ukuu.org.uk,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix race in AF_UNIX

* Miklos Szeredi <miklos@...redi.hu> 2007-06-18 11:44
> Garbage collection only ever happens, if the app is sending AF_UNIX
> sockets over AF_UNIX sockets.  Which is a rather rare case.  And which
> is basically why this bug went unnoticed for so long.
> 
> So my second patch only affects the performance of _exactly_ those
> apps which might well be bitten by the bug itself.

That's not entirely the truth. It affects all applications using
AF_UNIX sockets while file descriptors are being transfered. I
agree that the performance impact is not severe on most systems
but if file descriptors are being transfered continously by just
a single application it can become rather severe.
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