linux-kernel - Re: [ABOMINATION] x86: Fast interrupt return to userspace

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Message-ID: <20140506184922.61ba640b@gandalf.local.home>
Date:	Tue, 6 May 2014 18:49:22 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [ABOMINATION] x86: Fast interrupt return to userspace

On Tue, 6 May 2014 14:48:50 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:


> Yeah, it's disgusting. I think it is worth fixing to get better
> numbers (it *would* be very interesting to hear whether this plus the
> kernel 'retq' thing actually makes real device interrupt overhead
> lower), but I'd be very wary of using it in production.

Darn it. I was actually hoping that someone else could have the
reputation of doing "I can't believe they actually did this" code in the
kernel.

-- Steve
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