linux-kernel - Re: [PATCH -v4] random: introduce getrandom(2) system call

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Message-ID: <20140730221819.GB18189@amd.pavel.ucw.cz>
Date:	Thu, 31 Jul 2014 00:18:19 +0200
From:	Pavel Machek <pavel@....cz>
To:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
Cc:	Bob Beck <beck@...nbsd.org>, Theodore Ts'o <tytso@....edu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-api@...r.kernel.org,
	linux-crypto <linux-crypto@...r.kernel.org>,
	Theo de Raadt <deraadt@....openbsd.org>
Subject: Re: [PATCH -v4] random: introduce getrandom(2) system call

On Wed 2014-07-30 16:40:52, Bernd Petrovitsch wrote:
> On Mit, 2014-07-30 at 07:56 -0600, Bob Beck wrote:
> > Pavel. I have bit 'ol enterprise daemon running with established file
> > descriptors serving thousands of connections
> > which periodically require entropy.  Now I run out of descriptors. I
> > can't establish new connections. but I should
> > now halt all the other ones that require entropy?  I should raise
> > SIGKILL on my process serving these thousands
> > of connetions?  I don't think so.
> 
> If that long-running daemon periodically needs something from a device,
> one would better keep the fd for that open the whole time. Saves some
> CPU cycles and latency too BTW.

Agreed.

On the other hand, keeping a fd open is quite tricky for a
library. But better solution might be to make that easier.

open( , O_IM_A_LIBRARY_GIVE_ME_ONE_OF_THREE_RESERVED_FDS) might be one
solution. Actually, one reserved fd should be enough.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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