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From: "Pavel Dovgalyuk" <dovgaluk@ispras.ru>
References: <20180912081747.3228.21861.stgit@pasha-VirtualBox>
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Date: Thu, 13 Sep 2018 14:13:10 +0300
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Subject: Re: [Qemu-devel] [PATCH v6 22/25] replay: add BH oneshot event for
 block layer
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To: 'Paolo Bonzini' <pbonzini@redhat.com>, 'Pavel Dovgalyuk' <Pavel.Dovgaluk@ispras.ru>, qemu-devel@nongnu.org
Cc: kwolf@redhat.com, peter.maydell@linaro.org, war2jordan@live.com, crosthwaite.peter@gmail.com, boost.lists@gmail.com, quintela@redhat.com, ciro.santilli@gmail.com, jasowang@redhat.com, mst@redhat.com, zuban32s@gmail.com, armbru@redhat.com, maria.klimushenkova@ispras.ru, kraxel@redhat.com, thomas.dullien@googlemail.com, mreitz@redhat.com, alex.bennee@linaro.org, dgilbert@redhat.com, rth@twiddle.net

> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
> On 12/09/2018 10:19, Pavel Dovgalyuk wrote:
> > + uint64_t id = replay_get_current_step();
> > + replay_add_event(REPLAY_ASYNC_EVENT_BH_ONESHOT, cb, opaque, id);
> 
> Why does it need an id, while REPLAY_ASYNC_EVENT_BH does not?

Because _oneshot() function takes only context and callback,
and BH object is created inside that function.
Therefore to use the normal bh scheduling events we have to refactor
block code - add bh creation, scheduling, and freeing.

Pavel Dovgalyuk