Re: [Qemu-devel] [PATCH v9 19/21] replay: add BH oneshot event for block layer

["Pavel Dovgalyuk" <dovgaluk@ispras.ru>]

> From: Kevin Wolf [mailto:kwolf@redhat.com]
> Am 14.01.2019 um 12:10 hat Pavel Dovgalyuk geschrieben:
> > > From: Kevin Wolf [mailto:kwolf@redhat.com]
> > > Am 09.01.2019 um 13:13 hat Pavel Dovgalyuk geschrieben:
> > > > Replay is capable of recording normal BH events, but sometimes
> > > > there are single use callbacks scheduled with aio_bh_schedule_oneshot
> > > > function. This patch enables recording and replaying such callbacks.
> > > > Block layer uses these events for calling the completion function.
> > > > Replaying these calls makes the execution deterministic.
> > > >
> > > > Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
> > >
> > > This still doesn't come even close to catching all BHs that need to be
> > > caught. While you managed to show a few BHs that actually don't need to
> > > be considered for recording when I asked for this in v7, most BHs in the
> > > block layer can in some way lead to device callbacks and must therefore
> > > be recorded.
> >
> > Let's have a brief review. I can change all the places, but how
> > should I make a test case to be sure, that all of them are working ok?
> 
> The list is changing all the time. This is why I am so concerned about
> special-casing a few callers instead of having a generic solution. I
> don't know how we could make sure that we call the right function
> everywhere.

I changed all oneshot invocations in the block layer in the new version.
Can you review it and other block-related patches?

Pavel Dovgalyuk