GNU bug report logs - #22287
25.1.50; Sudden jumping point in buffer

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From: Eli Zaretskii <eliz <at> gnu.org>
To: "Stefan-W. Hahn" <stefan.hahn <at> s-hahn.de>
Cc: 22287 <at> debbugs.gnu.org, deng <at> randomsample.de
Subject: bug#22287: 25.1.50; Sudden jumping point in buffer
Date: Tue, 05 Jan 2016 18:27:22 +0200

> Date: Tue, 5 Jan 2016 16:01:22 +0100
> From: "Stefan-W. Hahn" <stefan.hahn <at> s-hahn.de>
> Cc: deng <at> randomsample.de, 22287 <at> debbugs.gnu.org
> 
> Thanks for this hint. I wasn't aware of this, after reading the good
> documentation etc/DEBUG, great possibilities.
> 
> I've sat it up and am able to define a watchpoint which calls xbacktrace. I
> have to play around with it a little, because in this straight forward
> atempt, it is to slow. There is no possibility to do any real keystrokes in
> the debuged emacs.

Probably because you defined the watchpoint so that GDB was forced to
use software watchpoints, rather than hardware-assisted watchpoints.
The latter doesn't slow down Emacs.

If you tell how you defined the watchpoint, I might be able to help
you redefine it so that hardware-assisted watchpoints are used by GDB.

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