From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Avi Kivity <avi@redhat.com>
Cc: Raghavendra K T <raghukt@linux.vnet.ibm.com>,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
"H. Peter Anvin" <hpa@zytor.com>, Gleb Natapov <gleb@redhat.com>,
Virtualization <virtualization@lists.linux-foundation.org>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
x86@kernel.org, KVM <kvm@vger.kernel.org>,
Dave Jiang <dave.jiang@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Xen <xen-devel@lists.xensource.com>,
Sedat Dilek <sedat.dilek@gmail.com>,
Yinghai Lu <yinghai@kernel.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
Ingo Molnar <mingo@redhat.com>, Rik van Riel <riel@redhat.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
LKML <linux-kernel@vger.kernel.org>,
Suzuki Poulose <suzuki@linux.vnet.ibm.com>,
Pete
Subject: Re: [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls to support pv-ticketlock
Date: Wed, 26 Oct 2011 13:09:48 -0700 [thread overview]
Message-ID: <4EA8690C.1040209@goop.org> (raw)
In-Reply-To: <4EA7E21B.8020805@redhat.com>
On 10/26/2011 03:34 AM, Avi Kivity wrote:
> On 10/25/2011 08:24 PM, Raghavendra K T wrote:
>> So then do also you foresee the need for directed yield at some point,
>> to address LHP? provided we have good improvements to prove.
> Doesn't this patchset completely eliminate lock holder preemption?
Well, there's the question of whether its better for someone waiting for
a contended lock to just go to sleep and rely on the scheduler to give
CPU time to whoever currently has the lock, or if the scheduler needs a
little hint to boost the lock holder by giving it the waiter's timeslice.
I tend to prefer the former, since there's no reason to suppose that the
the lock holder vcpu is necessarily the scheduler's top priority, and it
may want to schedule something else anyway.
J
next prev parent reply other threads:[~2011-10-26 20:09 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-23 19:03 [PATCH RFC V2 0/5] kvm : Paravirt-spinlock support for KVM guests Raghavendra K T
2011-10-23 19:04 ` [PATCH RFC V2 1/5] debugfs: Add support to print u32 array in debugfs Raghavendra K T
2011-10-23 19:04 ` [PATCH RFC V2 2/5] debugfs: Renaming of xen functions and change unsigned to u32 Raghavendra K T
2011-10-23 22:19 ` Greg KH
2011-10-24 9:28 ` Raghavendra K T
2011-10-24 9:38 ` Greg KH
2011-10-23 19:05 ` [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls to support pv-ticketlock Raghavendra K T
2011-10-23 19:07 ` [PATCH RFC V2 4/5] kvm guest : Added configuration support to enable debug information for KVM Guests Raghavendra K T
2011-10-24 10:01 ` Sasha Levin
2011-10-24 18:45 ` Raghavendra K T
2011-10-24 10:15 ` Avi Kivity
2011-10-25 18:11 ` Raghavendra K T
2011-10-25 18:30 ` Jeremy Fitzhardinge
2011-10-23 19:07 ` [PATCH RFC V2 5/5] kvm guest : pv-ticketlocks support for linux guests running on KVM hypervisor Raghavendra K T
[not found] ` <20111023190403.16364.30897.sendpatchset@oc5400248562.ibm.com>
2011-10-23 22:20 ` [PATCH RFC V2 1/5] debugfs: Add support to print u32 array in debugfs Greg KH
2011-10-24 9:30 ` Raghavendra K T
[not found] ` <20111023190558.16364.2136.sendpatchset@oc5400248562.ibm.com>
2011-10-24 10:01 ` [PATCH RFC V2 3/5] kvm hypervisor : Add two hypercalls to support pv-ticketlock Sasha Levin
2011-10-24 11:00 ` Raghavendra K T
2011-10-24 10:14 ` Avi Kivity
2011-10-24 11:20 ` Raghavendra K T
2011-10-24 12:27 ` Srivatsa Vaddagiri
2011-10-24 13:09 ` Avi Kivity
2011-10-24 13:50 ` Srivatsa Vaddagiri
2011-10-25 18:24 ` Raghavendra K T
2011-10-26 10:34 ` Avi Kivity
2011-10-26 19:08 ` Raghavendra K T
2011-10-27 10:17 ` Avi Kivity
2011-10-26 20:09 ` Jeremy Fitzhardinge [this message]
[not found] ` <20111023190753.16364.31164.sendpatchset@oc5400248562.ibm.com>
2011-10-24 10:01 ` [PATCH RFC V2 5/5] kvm guest : pv-ticketlocks support for linux guests running on KVM hypervisor Sasha Levin
2011-10-24 9:33 ` Raghavendra K T
2011-10-25 18:34 ` Jeremy Fitzhardinge
2011-10-26 19:23 ` Raghavendra K T
2011-10-26 19:46 ` Jeremy Fitzhardinge
2011-10-26 19:55 ` Raghavendra K T
2011-10-25 18:35 ` Jeremy Fitzhardinge
2011-10-26 19:25 ` Raghavendra K T
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