lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Sat, 8 Aug 2009 12:14:39 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	Greg KH <greg@...ah.com>
Cc:	Chris Friesen <cfriesen@...tel.com>,
	Andi Kleen <andi@...stfloor.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Jan Blunck <jblunck@...e.de>, gregkh@...e.de,
	Harald Hoyer <harald@...hat.com>,
	Scott James Remnant <scott@...ntu.com>
Subject: Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev

Greg KH wrote:
> On Sat, Aug 08, 2009 at 12:17:31AM +0300, Al Boldi wrote:
> > For devtmpfs to be a realistic replacement for static /dev, it has to
> > be comparable to static /dev in both speed and size.
>
> Since when is this requirement necessary?  You want something for free
> in both speed and size?  Well, you got it in speed, but not size, it
> will take up memory that is swapable, and a tiny ammount of non-swapable
> kernel memory for the code.

Not so tiny when you count in the hotplug dependency.

> > WRT speed, there should be no  slowdown and it should be just as fast
> > as a "tar -xp < dev.tar".
>
> Again, where is this requirement coming from?
>
> Have you timed devtmpfs?

Not yet, I am still waiting for the latest patch against .30.

> > WRT size, it should not be dependent on hotplug, and instead offer
> > hotplug as an option.
>
> Um, again, who made up such a requirement?  Are you running systems
> today with CONFIG_HOTPLUG disabled?  If so, how well is that working for
> you?

It's working out quite well.  I don't like hotplug, it's too slow.  I always 
turn it and module-autoloading off, to achieve a much more responsive system.


Thanks!

--
Al

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists