how to make 'watch xx' quicker in gdb-sub?

sdf <[email protected]> Thu, 15 Sep 2016 07:06:44 +0800 (CST)
Newsgroups gmane.comp.emulators.bochs.devel
Message-ID <[email protected]>
Good morning, everyone.
I found that the 'watch' command in gdb-stub is too slow, i used it like this:
   > set can-use-hw-watchpoints 0
   >watch &var
It's works , but it usually keeps running more than one minutes before capturing the read/write access.
I had worked under boch's internal debugger in the past, i remember that bochs could do this command very fast.  It seems that she was using 'Hardware Breakpoint' in that case.

Could some one tell me, how to achieve this under gdb-stub ?
Thanks !

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