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Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug
From: |
liu ping fan |
Subject: |
Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug |
Date: |
Tue, 25 Jun 2013 14:32:55 +0800 |
On Tue, Jun 25, 2013 at 2:24 PM, Paolo Bonzini <address@hidden> wrote:
> Il 25/06/2013 19:38, Liu Ping Fan ha scritto:
>> This series relies on refcnt of object used by bh callback to run against
>> unplug.
>>
>> Open issue:
>> Another choice may be rcu, but I think some issues are hard to resolve.
>> Using rcu, we have two choice:
>> when holding object refcnt, call qemu_bh_delete(); then after grace
>> period, we can release.
>> Or making qemu_bh_delete() sync in the path of DeviceState's finalization.
>
> What do you mean exactly? qemu_bh_delete() is async, but it operates on
> dynamically-allocated memory.
>
Before DeviceState is freed, we should make sure the bh is delete, and
not related bh is in fly.
> Paolo
>
>> but currently, the callers of qemu_bh_delete() can not satisfy any of the
>> two condition.
>
- [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, Liu Ping Fan, 2013/06/25
- [Qemu-devel] [PATCH 1/3] QEMUBH: introduce canceled member for bh, Liu Ping Fan, 2013/06/25
- [Qemu-devel] [PATCH 2/3] QEMUBH: pin bh's referring object while scheduling, Liu Ping Fan, 2013/06/25
- [Qemu-devel] [PATCH 3/3] virtio-net: set referred object for virtio net's bh, Liu Ping Fan, 2013/06/25
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, Paolo Bonzini, 2013/06/25
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug,
liu ping fan <=
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, Paolo Bonzini, 2013/06/25
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, liu ping fan, 2013/06/25
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, Paolo Bonzini, 2013/06/26
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, liu ping fan, 2013/06/26
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, Paolo Bonzini, 2013/06/26
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, liu ping fan, 2013/06/26
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, Paolo Bonzini, 2013/06/26
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, liu ping fan, 2013/06/26
- Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug, Paolo Bonzini, 2013/06/27