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Date: Sat, 10 Aug 2013 10:38:12 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [RFC] [PATCHv8 09/30] aio / timers: Add
 QEMUTimerListGroup and helper functions
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To: liu ping fan <qemulist@gmail.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Anthony Liguori <aliguori@us.ibm.com>, Alex Bligh <alex@alex.org.uk>, qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>, MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>, rth@twiddle.net

Il 10/08/2013 05:27, liu ping fan ha scritto:
>> > ... except if we get rid of TimerListGroup completely and put it in
>> > AioContext.  To do so, we can have _two_ AioContexts in main-loop.c.
>> > One is for the block layer, the other is only used for timers.  Later we
> Why can the AioContexts of block layer NOT hold timers?  For the
> reason mainloop's iohandler runs after it?  Or any reason raised by
> blocklayer itself?

The point of this series is to make the AioContexts of the block layer
able to hold timers.

At the same time, however, the main loop's timers cannot run during a
qemu_aio_wait(), as that would be backwards-incompatible.  So I'm
proposing to have two AioContext, and in the future separate
timers-for-the-block-layer from timers-for-everything-else.

Paolo