From: Avi Kivity <avi@redhat.com>
To: Jan Kiszka <jan.kiszka@web.de>
Cc: sheng@linux.intel.com, Jan Kiszka <jan.kiszka@siemens.com>,
kvm@vger.kernel.org, jiajun.xu@intel.com
Subject: Re: [PATCH 3/3] KVM: x86: Optimize NMI watchdog delivery
Date: Sun, 19 Oct 2008 13:15:20 +0200 [thread overview]
Message-ID: <48FB16C8.2010503@redhat.com> (raw)
In-Reply-To: <48F8CDF0.4070902@web.de>
Jan Kiszka wrote:
> If you have dozens of lapics, you don't want to check them all if they
> are ALL switched of anyway. That information is better encoded in a
> single, (virtual) system-wide bool. That's the most common case we want
> to speed up. And it is the core of the optimization Avi suggested
> (unless I totally misunderstood him).
>
>
Yes, that's what I meant. Touching vcpu data is expensive since it's
likely to be in MESI (or whatever it's called now) exclusive mode on
some other cpu.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-10-19 11:15 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-15 14:27 [PATCH 0/3] KVM: x86: Fix and optimize in-kernel NMI watchdog support Jan Kiszka
2008-10-15 14:27 ` [PATCH 1/3] KVM: x86: Relax accept conditions of kvm_apic_accept_pic_intr Jan Kiszka
2008-10-17 5:11 ` Sheng Yang
2008-10-17 8:10 ` Jan Kiszka
2008-10-17 16:35 ` Sheng Yang
2008-10-17 17:35 ` Jan Kiszka
2008-10-17 17:47 ` Sheng Yang
2008-10-17 17:56 ` Jan Kiszka
2008-10-17 18:12 ` Jan Kiszka
2008-10-17 18:14 ` Jan Kiszka
2008-10-18 2:44 ` Sheng Yang
2008-10-18 3:02 ` Sheng Yang
2008-10-18 8:29 ` Jan Kiszka
2008-10-17 18:15 ` Sheng Yang
2008-10-17 15:31 ` Xu, Jiajun
2008-10-15 14:27 ` [PATCH 2/3] KVM: x86: Dont deliver PIT IRQs to masked LVT0s Jan Kiszka
2008-10-17 15:23 ` Alexander Graf
2008-10-17 15:37 ` Jan Kiszka
2008-10-17 15:44 ` Alexander Graf
2008-10-17 18:14 ` Alexander Graf
2008-10-15 14:27 ` [PATCH 3/3] KVM: x86: Optimize NMI watchdog delivery Jan Kiszka
2008-10-17 17:06 ` Sheng Yang
2008-10-17 17:23 ` Jan Kiszka
2008-10-17 17:34 ` Sheng Yang
2008-10-17 17:40 ` Jan Kiszka
2008-10-17 18:26 ` Sheng Yang
2008-10-17 18:39 ` Jan Kiszka
2008-10-19 11:15 ` Avi Kivity [this message]
2008-10-19 11:13 ` [PATCH 0/3] KVM: x86: Fix and optimize in-kernel NMI watchdog support Avi Kivity
2008-10-19 13:03 ` Sheng Yang
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