From: Rik van Riel <riel@redhat.com>
To: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Marcelo Tosatti <mtosatti@redhat.com>,
Ingo Molnar <mingo@redhat.com>, Avi Kivity <avi@redhat.com>,
S390 <linux-s390@vger.kernel.org>,
Carsten Otte <cotte@de.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
KVM <kvm@vger.kernel.org>, chegu vinod <chegu_vinod@hp.com>,
"Andrew M. Theurer" <habanero@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>, X86 <x86@kernel.org>,
Gleb Natapov <gleb@redhat.com>,
linux390@de.ibm.com,
Srivatsa Vaddagiri <srivatsa.vaddagiri@gmail.com>,
Joerg Roedel <joerg.roedel@amd.com>
Subject: Re: [PATCH RFC V2 2/2] kvm PLE handler: Choose better candidate for directed yield
Date: Tue, 10 Jul 2012 15:40:43 -0400 [thread overview]
Message-ID: <4FFC853B.30900@redhat.com> (raw)
In-Reply-To: <20120710193138.16440.31791.sendpatchset@codeblue>
On 07/10/2012 03:31 PM, Raghavendra K T wrote:
> From: Raghavendra K T<raghavendra.kt@linux.vnet.ibm.com>
>
> Currently PLE handler can repeatedly do a directed yield to same vcpu
> that has recently done PL exit. This can degrade the performance.
>
> Try to yield to most eligible guy instead by alternate yielding.
> Precisely, give chance to a VCPU which has:
> (a) Not done PLE exit at all (probably he is preempted lock-holder)
> (b) VCPU skipped in last iteration because it did PL exit, and probably
> has become eligible now (next eligible lock holder)
>
> Signed-off-by: Raghavendra K T<raghavendra.kt@linux.vnet.ibm.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
--
All rights reversed
next prev parent reply other threads:[~2012-07-10 19:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-10 19:30 [PATCH RFC V2 0/2] kvm: Improving directed yield in PLE handler Raghavendra K T
2012-07-10 19:31 ` [PATCH RFC V2 1/2] kvm vcpu: Note down pause loop exit Raghavendra K T
2012-07-10 19:40 ` Rik van Riel
2012-07-10 19:31 ` [PATCH RFC V2 2/2] kvm PLE handler: Choose better candidate for directed yield Raghavendra K T
2012-07-10 19:40 ` Rik van Riel [this message]
2012-07-10 20:50 ` Ingo Molnar
2012-07-11 3:00 ` Raghavendra K T
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