From: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: peterz@infradead.org, mingo@elte.hu, avi@redhat.com,
raghukt@linux.vnet.ibm.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, x86@kernel.org, jeremy@goop.org,
vatsa@linux.vnet.ibm.com, hpa@zytor.com
Subject: Re: [PATCH v2 5/7] KVM: Introduce PV kick in flush tlb
Date: Tue, 03 Jul 2012 13:55:02 +0530 [thread overview]
Message-ID: <87r4stckv5.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <20120703080713.GA12579@amt.cnet>
On Tue, 3 Jul 2012 05:07:13 -0300, Marcelo Tosatti <mtosatti@redhat.com> wrote:
> On Mon, Jun 04, 2012 at 10:38:17AM +0530, Nikunj A. Dadhania wrote:
> > In place of looping continuously introduce a halt if we do not succeed
> > after some time.
> >
> > For vcpus that were running an IPI is sent. In case, it went to sleep
> > between this, we will be doing flush_on_enter(harmless). But as a
> > flush IPI was already sent, that will be processed in ipi handler,
> > this might result into something undesireable, i.e. It might clear the
> > flush_mask of a new request.
> >
> > So after sending an IPI and waiting for a while, do a halt and wait
> > for a kick from the last vcpu.
> >
> > Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
> > Signed-off-by: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
>
> Again, was it determined that this is necessary from data of
> benchmarking on the in-guest-mode/out-guest-mode patch?
>
No, this is more of a fix wrt algo.
next prev parent reply other threads:[~2012-07-03 8:25 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-04 5:05 [PATCH v2 0/7] KVM paravirt remote flush tlb Nikunj A. Dadhania
2012-06-04 5:06 ` [PATCH v2 1/7] KVM Guest: Add VCPU running/pre-empted state for guest Nikunj A. Dadhania
2012-06-12 22:43 ` Marcelo Tosatti
2012-06-19 6:03 ` Nikunj A Dadhania
2012-06-04 5:06 ` [PATCH v2 2/7] KVM-HV: " Nikunj A. Dadhania
2012-06-04 5:07 ` [PATCH v2 3/7] KVM: Add paravirt kvm_flush_tlb_others Nikunj A. Dadhania
2012-06-12 23:02 ` Marcelo Tosatti
2012-06-19 6:11 ` Nikunj A Dadhania
2012-06-21 12:26 ` Marcelo Tosatti
2012-07-03 7:55 ` Marcelo Tosatti
2012-07-03 8:19 ` Nikunj A Dadhania
2012-07-05 2:09 ` Marcelo Tosatti
2012-07-05 5:55 ` Nikunj A Dadhania
2012-07-06 9:47 ` Nikunj A Dadhania
2012-07-03 8:11 ` Marcelo Tosatti
2012-07-03 8:27 ` Nikunj A Dadhania
2012-06-04 5:07 ` [PATCH v2 4/7] KVM: export kvm_kick_vcpu for pv_flush Nikunj A. Dadhania
2012-06-04 5:08 ` [PATCH v2 5/7] KVM: Introduce PV kick in flush tlb Nikunj A. Dadhania
2012-07-03 8:07 ` Marcelo Tosatti
2012-07-03 8:25 ` Nikunj A Dadhania [this message]
2012-07-05 2:37 ` Marcelo Tosatti
2012-07-05 5:53 ` Nikunj A Dadhania
2012-06-04 5:08 ` [PATCH v2 6/7] kvm,x86: RCU based table free Nikunj A. Dadhania
2012-06-05 10:48 ` Stefano Stabellini
2012-06-05 11:08 ` Nikunj A Dadhania
2012-06-05 11:58 ` Stefano Stabellini
2012-06-05 13:04 ` Nikunj A Dadhania
2012-06-05 13:08 ` Peter Zijlstra
2012-06-05 13:26 ` Stefano Stabellini
2012-06-05 13:31 ` Peter Zijlstra
2012-06-05 13:41 ` Stefano Stabellini
2012-08-01 11:23 ` Stefano Stabellini
2012-08-01 12:12 ` Nikunj A Dadhania
2012-08-01 12:59 ` Stefano Stabellini
2012-06-05 15:29 ` Nikunj A Dadhania
2012-06-05 13:21 ` Stefano Stabellini
2012-06-04 5:08 ` [PATCH v2 7/7] Flush page-table pages before freeing them Nikunj A. Dadhania
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