From: Paolo Bonzini <pbonzini@redhat.com>
To: Avi Kivity <avi@cloudius-systems.com>
Cc: Gleb Natapov <gleb@redhat.com>, Avi Kivity <avi.kivity@gmail.com>,
"Huangweidong (C)" <weidong.huang@huawei.com>,
KVM <kvm@vger.kernel.org>, "Michael S. Tsirkin" <mst@redhat.com>,
"Jinxin (F)" <jinxin712@huawei.com>,
"Zhanghaoyu (A)" <haoyu.zhang@huawei.com>,
Luonengjun <luonengjun@huawei.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Zanghongyong <zanghongyong@huawei.com>
Subject: Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table
Date: Tue, 26 Nov 2013 16:28:34 +0100 [thread overview]
Message-ID: <5294BE22.7040105@redhat.com> (raw)
In-Reply-To: <5294BD61.7080904@cloudius-systems.com>
Il 26/11/2013 16:25, Avi Kivity ha scritto:
>> If we want to ensure, we need to use a different mechanism for
>> synchronization than the global RCU. QRCU would work; readers are not
>> wait-free but only if there is a concurrent synchronize_qrcu, which
>> should be rare.
>
> An alternative path is to convince ourselves that the hardware does not
> provide the guarantees that the current code provides, and so we can
> relax them.
No, I think it's a reasonable guarantee to provide.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Avi Kivity <avi@cloudius-systems.com>
Cc: "Huangweidong (C)" <weidong.huang@huawei.com>,
KVM <kvm@vger.kernel.org>, Gleb Natapov <gleb@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Zhanghaoyu (A)" <haoyu.zhang@huawei.com>,
Luonengjun <luonengjun@huawei.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Zanghongyong <zanghongyong@huawei.com>,
Avi Kivity <avi.kivity@gmail.com>,
"Jinxin (F)" <jinxin712@huawei.com>
Subject: Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table
Date: Tue, 26 Nov 2013 16:28:34 +0100 [thread overview]
Message-ID: <5294BE22.7040105@redhat.com> (raw)
In-Reply-To: <5294BD61.7080904@cloudius-systems.com>
Il 26/11/2013 16:25, Avi Kivity ha scritto:
>> If we want to ensure, we need to use a different mechanism for
>> synchronization than the global RCU. QRCU would work; readers are not
>> wait-free but only if there is a concurrent synchronize_qrcu, which
>> should be rare.
>
> An alternative path is to convince ourselves that the hardware does not
> provide the guarantees that the current code provides, and so we can
> relax them.
No, I think it's a reasonable guarantee to provide.
Paolo
next prev parent reply other threads:[~2013-11-26 15:28 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-26 12:40 [RFC] create a single workqueue for each vm to update vm irq routing table Zhanghaoyu (A)
2013-11-26 12:40 ` [Qemu-devel] " Zhanghaoyu (A)
2013-11-26 12:47 ` Paolo Bonzini
2013-11-26 12:47 ` [Qemu-devel] " Paolo Bonzini
2013-11-26 12:56 ` Gleb Natapov
2013-11-26 12:56 ` [Qemu-devel] " Gleb Natapov
2013-11-26 13:13 ` Paolo Bonzini
2013-11-26 13:13 ` [Qemu-devel] " Paolo Bonzini
2013-11-28 3:46 ` Zhanghaoyu (A)
2013-11-28 3:46 ` [Qemu-devel] " Zhanghaoyu (A)
2013-11-26 16:05 ` Michael S. Tsirkin
2013-11-26 16:05 ` [Qemu-devel] " Michael S. Tsirkin
2013-11-26 16:14 ` Gleb Natapov
2013-11-26 16:14 ` [Qemu-devel] " Gleb Natapov
2013-11-26 16:24 ` Michael S. Tsirkin
2013-11-26 16:24 ` [Qemu-devel] " Michael S. Tsirkin
2013-11-30 2:46 ` Zhanghaoyu (A)
2013-11-30 2:46 ` [Qemu-devel] " Zhanghaoyu (A)
2013-11-26 13:18 ` Avi Kivity
2013-11-26 13:18 ` [Qemu-devel] " Avi Kivity
2013-11-26 13:47 ` Paolo Bonzini
2013-11-26 13:47 ` [Qemu-devel] " Paolo Bonzini
2013-11-26 14:36 ` Avi Kivity
2013-11-26 14:36 ` [Qemu-devel] " Avi Kivity
2013-11-26 14:46 ` Paolo Bonzini
2013-11-26 14:46 ` Paolo Bonzini
2013-11-26 14:54 ` Avi Kivity
2013-11-26 14:54 ` Avi Kivity
2013-11-26 15:03 ` Gleb Natapov
2013-11-26 15:03 ` Gleb Natapov
2013-11-26 15:20 ` Paolo Bonzini
2013-11-26 15:20 ` Paolo Bonzini
2013-11-26 15:25 ` Avi Kivity
2013-11-26 15:25 ` Avi Kivity
2013-11-26 15:28 ` Paolo Bonzini [this message]
2013-11-26 15:28 ` Paolo Bonzini
2013-11-26 15:35 ` Avi Kivity
2013-11-26 15:35 ` Avi Kivity
2013-11-26 15:58 ` Paolo Bonzini
2013-11-26 15:58 ` Paolo Bonzini
2013-11-26 16:06 ` Avi Kivity
2013-11-26 16:06 ` Avi Kivity
2013-11-26 16:11 ` Michael S. Tsirkin
2013-11-26 16:11 ` Michael S. Tsirkin
2013-11-26 16:21 ` Avi Kivity
2013-11-26 16:21 ` Avi Kivity
2013-11-26 16:42 ` Paolo Bonzini
2013-11-26 16:42 ` Paolo Bonzini
2013-11-26 16:08 ` Michael S. Tsirkin
2013-11-26 16:08 ` Michael S. Tsirkin
2013-11-26 16:24 ` Gleb Natapov
2013-11-26 16:24 ` Gleb Natapov
2013-11-26 16:27 ` Avi Kivity
2013-11-26 16:27 ` Avi Kivity
2013-11-26 16:38 ` Gleb Natapov
2013-11-26 16:38 ` Gleb Natapov
2013-11-26 16:28 ` Paolo Bonzini
2013-11-26 16:28 ` Paolo Bonzini
2013-11-26 16:29 ` Avi Kivity
2013-11-26 16:29 ` Avi Kivity
2013-11-26 16:37 ` Gleb Natapov
2013-11-26 16:37 ` Gleb Natapov
2013-11-28 6:27 ` Zhanghaoyu (A)
2013-11-28 6:27 ` Zhanghaoyu (A)
2013-11-28 8:55 ` Paolo Bonzini
2013-11-28 8:55 ` Paolo Bonzini
2013-11-28 9:19 ` Gleb Natapov
2013-11-28 9:19 ` Gleb Natapov
2013-11-28 9:29 ` Paolo Bonzini
2013-11-28 9:29 ` Paolo Bonzini
2013-11-28 9:43 ` Gleb Natapov
2013-11-28 9:43 ` Gleb Natapov
2013-11-28 9:49 ` Avi Kivity
2013-11-28 9:49 ` Avi Kivity
2013-11-28 9:53 ` Paolo Bonzini
2013-11-28 9:53 ` Paolo Bonzini
2013-11-28 10:16 ` Avi Kivity
2013-11-28 10:16 ` Avi Kivity
2013-11-28 10:40 ` Paolo Bonzini
2013-11-28 10:40 ` Paolo Bonzini
2013-11-28 10:47 ` Avi Kivity
2013-11-28 10:47 ` Avi Kivity
2013-11-28 11:09 ` Gleb Natapov
2013-11-28 11:09 ` Gleb Natapov
2013-11-28 11:10 ` Paolo Bonzini
2013-11-28 11:10 ` Paolo Bonzini
2013-11-28 11:16 ` Avi Kivity
2013-11-28 11:16 ` Avi Kivity
2013-11-28 11:23 ` Gleb Natapov
2013-11-28 11:23 ` Gleb Natapov
2013-11-28 11:31 ` Paolo Bonzini
2013-11-28 11:31 ` Paolo Bonzini
2013-11-28 11:33 ` Avi Kivity
2013-11-28 11:33 ` Avi Kivity
2013-11-28 10:11 ` Gleb Natapov
2013-11-28 10:11 ` Gleb Natapov
2013-11-28 10:12 ` Avi Kivity
2013-11-28 10:12 ` Avi Kivity
2013-11-28 11:02 ` Gleb Natapov
2013-11-28 11:02 ` Gleb Natapov
2013-11-28 11:18 ` Avi Kivity
2013-11-28 11:18 ` Avi Kivity
2013-11-28 11:22 ` Gleb Natapov
2013-11-28 11:22 ` Gleb Natapov
2013-11-28 11:30 ` Avi Kivity
2013-11-28 11:30 ` [Qemu-devel] " Avi Kivity
2013-11-28 11:33 ` Michael S. Tsirkin
2013-11-28 11:33 ` Michael S. Tsirkin
2013-11-28 11:33 ` Gleb Natapov
2013-11-28 11:33 ` Gleb Natapov
2013-11-26 15:24 ` Avi Kivity
2013-11-26 15:24 ` Avi Kivity
2013-11-28 9:14 ` Zhanghaoyu (A)
2013-11-28 9:14 ` Zhanghaoyu (A)
2013-11-28 9:20 ` Gleb Natapov
2013-11-28 9:20 ` Gleb Natapov
2013-11-26 12:48 ` Gleb Natapov
2013-11-26 12:48 ` [Qemu-devel] " Gleb Natapov
2013-11-26 12:50 ` Gleb Natapov
2013-11-26 12:50 ` [Qemu-devel] " Gleb Natapov
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