linux-kernel - Re: [RFC] [PATCH] Pre-emption control for userspace

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:	Wed, 5 Mar 2014 01:39:07 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Khalid Aziz <khalid.aziz@...cle.com>
cc:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	peterz@...radead.org, akpm@...ux-foundation.org,
	andi.kleen@...el.com, rob@...dley.net, viro@...iv.linux.org.uk,
	oleg@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH] Pre-emption control for userspace

On Tue, 4 Mar 2014, Khalid Aziz wrote:
> be in the right control group. Besides they want to use a common mechanism
> across multiple OSs and pre-emption delay is already in use on other OSs. Good
> idea though.

Well, just because preemption delay is a mechanism exposed by some
other OS does not make it a good idea.

In fact its a horrible idea.

What you are creating is a crystal ball based form of time bound
priority ceiling with the worst user space interface i've ever seen.

Thanks,

	tglx
--
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/