From: "H. Peter Anvin" <hpa@zytor.com>
To: Andy Lutomirski <luto@amacapital.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
x86@kernel.org, Steven Rostedt <rostedt@goodmis.org>,
Gleb Natapov <gleb@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v2] x86: Return to kernel without IRET
Date: Fri, 02 May 2014 21:03:10 -0700 [thread overview]
Message-ID: <53646A7E.8010400@zytor.com> (raw)
In-Reply-To: <6cfe29821979c42cd812878e05577f69f99fafaf.1399074748.git.luto@amacapital.net>
On 05/02/2014 04:53 PM, Andy Lutomirski 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%.
>
> Signed-off-by: Andy Lutomirski <luto@amacapital.net>
I'd really like to see a workload which would genuinely benefit before
adding more complexity. Now... if we can determine that it doesn't harm
anything and would solve the NMI nesting problem cleaner than the
current solution, that would justify things, too...
-hpa
next prev parent reply other threads:[~2014-05-03 4:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-02 23:53 [PATCH v2] x86: Return to kernel without IRET Andy Lutomirski
2014-05-03 4:03 ` H. Peter Anvin [this message]
2014-05-03 11:24 ` Steven Rostedt
2014-05-03 22:19 ` H. Peter Anvin
2014-05-03 23:51 ` Andy Lutomirski
2014-05-04 0:31 ` Andy Lutomirski
2014-05-04 2:15 ` H. Peter Anvin
2014-05-04 2:14 ` H. Peter Anvin
2014-05-05 15:47 ` Andy Lutomirski
2014-05-03 4:32 ` Linus Torvalds
2014-05-03 6:12 ` H. Peter Anvin
2014-05-03 13:54 ` Linus Torvalds
2014-05-03 19:00 ` H. Peter Anvin
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