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

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Message-ID: <yw1xeh06wka8.fsf@unicorn.mansr.com>
Date:	Wed, 07 May 2014 00:37:51 +0100
From:	Måns Rullgård <mans@...sr.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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

Steven Rostedt <rostedt@...dmis.org> writes:

> 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.

Hey, I tried: http://article.gmane.org/gmane.linux.kernel/1594134

-- 
Måns Rullgård
mans@...sr.com
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