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Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 0/3] make bh safe with hot-unplug
Date: Tue, 25 Jun 2013 08:24:28 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

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.


> but currently, the callers of qemu_bh_delete() can not satisfy any of the two 
> condition.

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