linux-kernel - Re: [PATCH] x86: Return to kernel without IRET

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Message-ID: <CA+55aFw_fz=eDPK+8v=7B=jkyhN8YDRCNJgq8XSo_NJLxB8z+w@mail.gmail.com>
Date:	Fri, 2 May 2014 17:11:59 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH] x86: Return to kernel without IRET

On Fri, May 2, 2014 at 4:51 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On my box, this saves about 100ns on each interrupt and trap that
> happens while running in kernel space.  This speeds up my kernel_pf
> microbenchmark by about 17%.

Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>

Now it just needs lots of testing to make sure it's all good. But I
can't imagine what would go wrong.

               Linus
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