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From: martin rudalics <rudalics@gmx.at>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 12867@debbugs.gnu.org
Subject: bug#12867: 24.3.50; easy-to-repro crash involving mode line
Date: Mon, 12 Nov 2012 18:31:53 +0100	[thread overview]
Message-ID: <50A13289.4050301@gmx.at> (raw)
In-Reply-To: <83obj2x218.fsf@gnu.org>

 > The need to redisplay the mode line on every move of point is a killer
 > of many redisplay optimizations.  It is also potentially expensive by
 > itself, because it requires Emacs to count lines, something that is
 > not an easy operation in Emacs, which sees the buffer text as a linear
 > array of characters, not a series of lines.  So the display engine
 > tries very hard to avoid redisplaying the mode line if it decides that
 > the line number does not need to appear.

I think it would make sense to use a cache for maintaining line numbers.

martin





  parent reply	other threads:[~2012-11-12 17:31 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-12  3:52 bug#12867: 24.3.50; easy-to-repro crash involving mode line Drew Adams
2012-11-12 15:40 ` Eli Zaretskii
2012-11-12 17:09   ` Drew Adams
2012-11-12 17:52     ` Eli Zaretskii
2012-11-12 18:16       ` Drew Adams
2012-11-12 18:35         ` Eli Zaretskii
2012-11-12 19:07           ` bug#12872: " Drew Adams
2012-11-12 17:31   ` martin rudalics [this message]
2012-11-12 18:19     ` Eli Zaretskii
2012-11-12 20:55       ` Stefan Monnier
2012-11-13  8:22         ` martin rudalics
2012-11-13 12:52           ` Eli Zaretskii
2012-11-13 13:50             ` martin rudalics

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