can you forward me the patch please. Peter. Also, as far as I understand, tb unlinking can only happen in 2 cases.
1. some other tbs being invalidated. 2. interrrupt pending Am I right ? Thanks Xin On Fri, Dec 9, 2011 at 6:45 PM, Peter Maydell <peter.mayd...@linaro.org> wrote: > On 9 December 2011 18:44, Xin Tong <xerox.time.t...@gmail.com> 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
