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Date: Thu, 22 Sep 2011 10:27:58 +0800
From: Lei Li <lilei@linux.vnet.ibm.com>
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Subject: Re: [Qemu-devel] TB chaining
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To: =?UTF-8?B?6Zmz6Z+L5Lu7?= <chenwj@iis.sinica.edu.tw>
Cc: qemu-devel <qemu-devel@nongnu.org>, Xin Tong <xerox.time.tech@gmail.com>

On 09/22/2011 09:58 AM, =E9=99=B3=E9=9F=8B=E4=BB=BB wrote:

>>       /* list of TBs jumping to this one. This is a circular list usin=
g
>>          the two least significant bits of the pointers to tell what i=
s
>>          the next pointer: 0 =3D jmp_next[0], 1 =3D jmp_next[1], 2 =3D
>>          jmp_first */
>>       struct TranslationBlock *jmp_next[2];
>>       struct TranslationBlock *jmp_first;
>    After tracing the code, I found the comment might be wrong.
> For example, if we link tb1 to tb2, i.e., tb1 ->  tb2. Then
> "tb1->jmp_next[n] =3D tb2" and "tb2->jmp_first =3D tb1" (roughly
> speaking). I'm not sure if I misunderstand the comment "list
> of TBs jumping to this one", or it is just wrong.
Well, the comment is from source code. I don't catch why you think "list
of TBS jumping to this one" is wrong.
My understand is that TB chain be used forreduce  switch  from the  trans=
lation
cache  to the  guest code. It will be a circular list if there is no inte=
rrupt
or exceptional.
At mean while, it's just the date related to TB chain in TB struct, it's
not about process of how TB chain work.

> Regards,
> chenwj
>

--=20
Lei