Re: [Qemu-devel] icount and tb chaining

[陳韋任]

On Thu, Jan 12, 2012 at 11:00:43AM -0800, James Greensky wrote:
> Hello all, I have a question about icount and tb chaining that I hope
> somebody can clear up.  In cpu-exec.c, when the icount_decr.u16.low
> counter expires, it passes back the current tb as the next_tb and add
> a jump with the least significant bits = 2. This falls through to tb
> add jump, which then updates the jmp_first field of the current tb.
> why is this done? Thanks -Jim

  Could you elaborate on the whole sequence? I am not sure where should
I look into to answer your question. Thanks.

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj