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Re: [Qemu-devel] QEMU TB Unlinking due to interrupt.
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] QEMU TB Unlinking due to interrupt. |
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Date: |
Fri, 9 Dec 2011 23:45:09 +0000 |
On 9 December 2011 18:44, Xin Tong <address@hidden> wrote:
> Currently, QEMU unchains TBs if there is an interrupt pending. I would
> like to know whether there is any reason behind this ? (why not
> checking interrupt status in the beginning of every tb ?)
The theory is that it's faster overall to do a slightly slow
operation (tb unlinking) on interrupts rather than do a check
at the beginning of every tb (happens a lot in the normal
code path).
However the tb unlinking code is racy and personally I think
we should get rid of it in favour of a simpler scheme like a
flag check. I have some prototype patches kicking around for
this.
-- PMM