From: Jan Kiszka <jan.kiszka@siemens.com>
To: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>, kvm <kvm@vger.kernel.org>,
Alex Williamson <alex.williamson@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH v4 2/9] KVM: Switch IRQ subsystem to SRCU
Date: Tue, 09 Nov 2010 12:21:46 +0100 [thread overview]
Message-ID: <4CD92ECA.1040508@siemens.com> (raw)
In-Reply-To: <4CD92722.2060908@redhat.com>
Am 09.11.2010 11:49, Avi Kivity wrote:
> On 11/08/2010 01:21 PM, Jan Kiszka wrote:
>> Ack and mask notifiers typically call back into kvm_set_irq, thus may
>> iterate over all VCPUs of a VM. Better keep this path preemptible to
>> prevent that user-space can massivle influence scheduling latencies. Use
>> sleepable RCU for the protection of irq_routing and the notfier lists.
>>
>
> What about preemptible RCU, now in mainline?
Granted, that would resolve the preemption issue but not allow to use
sleepy locks inside this section (as done by the last patch in this series).
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2010-11-09 11:22 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-08 11:21 [PATCH v4 0/9] KVM: Improve IRQ assignment for device passthrough Jan Kiszka
2010-11-08 11:21 ` [PATCH v4 1/9] KVM: Fix srcu struct leakage Jan Kiszka
2010-11-08 17:00 ` Michael S. Tsirkin
2010-11-08 17:32 ` Jan Kiszka
2010-11-08 11:21 ` [PATCH v4 2/9] KVM: Switch IRQ subsystem to SRCU Jan Kiszka
2010-11-09 10:49 ` Avi Kivity
2010-11-09 11:21 ` Jan Kiszka [this message]
2010-11-08 11:21 ` [PATCH v4 3/9] KVM: Clear assigned guest IRQ on release Jan Kiszka
2010-11-09 10:58 ` Avi Kivity
2010-11-09 11:20 ` Jan Kiszka
2010-11-09 18:36 ` Alex Williamson
2010-11-10 6:53 ` Avi Kivity
2010-11-26 10:36 ` Michael S. Tsirkin
2010-11-08 11:21 ` [PATCH v4 4/9] KVM: Switch assigned device IRQ forwarding to threaded handler Jan Kiszka
2010-11-09 12:26 ` Avi Kivity
2010-11-09 12:36 ` Jan Kiszka
2010-11-08 11:21 ` [PATCH v4 5/9] KVM: Refactor IRQ names of assigned devices Jan Kiszka
2010-11-08 11:21 ` [PATCH v4 6/9] KVM: Save/restore state of assigned PCI device Jan Kiszka
2010-11-09 12:35 ` Avi Kivity
2010-11-09 13:29 ` Jan Kiszka
2010-11-09 13:36 ` Avi Kivity
2010-11-09 13:44 ` Jan Kiszka
2010-11-09 13:46 ` Avi Kivity
2010-11-09 16:41 ` Don Dutile
2010-11-08 11:21 ` [PATCH v4 7/9] KVM: Clean up kvm_vm_ioctl_assigned_device Jan Kiszka
2010-11-08 11:21 ` [PATCH v4 8/9] KVM: Document device assigment API Jan Kiszka
2010-11-08 11:21 ` [PATCH v4 9/9] KVM: Allow host IRQ sharing for passed-through PCI 2.3 devices Jan Kiszka
2010-11-09 13:27 ` Avi Kivity
2010-11-09 13:35 ` Jan Kiszka
2010-11-09 13:41 ` Avi Kivity
2010-11-09 14:11 ` Jan Kiszka
2010-11-09 14:20 ` Avi Kivity
2010-11-16 16:55 ` [PATCH v4 0/9] KVM: Improve IRQ assignment for device passthrough Marcelo Tosatti
2010-11-16 18:26 ` Jan Kiszka
2010-11-17 8:25 ` Avi Kivity
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