From: malc <av1474@comtv.ru>
To: 陳韋任 <chenwj@iis.sinica.edu.tw>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Why we need unlink tb when cpu_interrupt/cpu_exit get called?
Date: Mon, 2 Apr 2012 13:15:11 +0400 (MSK) [thread overview]
Message-ID: <alpine.LNX.2.00.1204021255300.9502@linmac> (raw)
In-Reply-To: <20120402034542.GA59901@cs.nctu.edu.tw>
On Mon, 2 Apr 2012, ??? wrote:
> Hi all,
>
> I am wondering why we need to unlink tb when cpu_interrupt/cpu_exit is
> called, and want to know what happened if we don't unlink tb. In theory,
> QEMU want the execution flow comes back from code cache to QEMU itself
> so that interrupts can be handled as soon as possible. However, I ran
> linux-0.2.img with a modified QEMU whose cpu_unlink_tb does nothing.
> Everything seems work fine. Is this experiment too trivial to show what
> bad things happened when we don't unlink tb?
>
> Thanks! :)
Try following with and without tb unlinking on aforementioned image to
feel the difference:
sh-2.05b# echo "char main[]={0xeb,-2};" >h.c
sh-2.05b# tcc -run h.c
--
mailto:av1474@comtv.ru
next prev parent reply other threads:[~2012-04-02 9:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-02 3:45 [Qemu-devel] Why we need unlink tb when cpu_interrupt/cpu_exit get called? 陳韋任
2012-04-02 9:15 ` malc [this message]
2012-04-02 10:21 ` 陳韋任
2012-04-02 10:32 ` malc
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.LNX.2.00.1204021255300.9502@linmac \
--to=av1474@comtv.ru \
--cc=chenwj@iis.sinica.edu.tw \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).