GNU bug report logs - #45379
28.0.50; Degraded Performance of describe-buffer-bindings

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Message #52 received at 45379 <at> debbugs.gnu.org (full text, mbox):

From: "Sheng Yang" <styang <at> fastmail.com>
To: handa <handa <at> gnu.org>, "Eli Zaretskii" <eliz <at> gnu.org>
Cc: 45379 <at> debbugs.gnu.org, Stephen Berman <stephen.berman <at> gmx.net>,
 Stefan Kangas <stefan <at> marxist.se>, Stefan Monnier <monnier <at> iro.umontreal.ca>,
 Juri Linkov <juri <at> linkov.net>
Subject: Re: bug#45379: 28.0.50;
  Degraded Performance of describe-buffer-bindings
Date: Tue, 13 Apr 2021 22:06:29 -0500

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Any update on this? Having been using the patch for a few weeks now, seems fine for me.

On Thu, Apr 1, 2021, at 10:06, handa wrote:
> In article <838s65ktvk.fsf <at> gnu.org <mailto:838s65ktvk.fsf%40gnu.org>>, Eli Zaretskii <eliz <at> gnu.org <mailto:eliz%40gnu.org>> writes:
> 
> > > > Is the patch for the above improvement the one included in the file
> > > > 0001-Fix-describe-buffer-bindings-performance-regression.patch?
> > > 
> > > Yes, it is.
> 
> It seems that the main intention of that patch is to avoid unnecessary
> call of char_table_ref_and_range introduced by the commit below:
> 
> > >     Don't show key ranges if shadowed by different commands
> > > 
> > >     * src/keymap.c (describe_vector): Make sure found consecutive keys
> > >     are either not shadowed or, if they are, that they are shadowed by
> > >     the same command.  (Bug#9293)
> 
> In describe_vector, if VECTOR is a char-table, char_table_ref_and_range
> is already called at the fairly beginning of the main loop.  So, we do
> not have to call it again, and thus, I think the patch is doing the
> correct thing.
> 
> But, I don't know whether the following part in the patch is correct or
> not.
> 
> +   /* Ignore `self-insert-command' for performance.  */
> +   && !EQ (definition, Qself_insert_command))
> 
> ---
> K. Handa
> handa <at> gnu.org <mailto:handa%40gnu.org>
> 

Sheng Yang(杨圣), PhD
Computer Science Department
University of Maryland, College Park
E-mail: styang <at> fastmail.com
E-mail (old but still used): yangsheng6810 <at> gmail.com

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