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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Dmitry Antipov <dmantipov@yandex.ru>
Cc: Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: [Emacs-diffs] trunk r114117: * buffer.c (drop_overlay):
Date: Mon, 09 Sep 2013 15:41:32 -0400	[thread overview]
Message-ID: <jwvhadtztf1.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <522AAD7A.3030502@yandex.ru> (Dmitry Antipov's message of "Sat, 07 Sep 2013 08:37:14 +0400")

> I'm also thinking about offloading GC with explicit marker freeing.
> For example, save-excursion creates up to 2 markers each time, and
> this is the well-known bottleneck because there may be thousands
> calls to save-excursion per just one basic editing command in cc-mode.

I'm not sure it would be worth the trouble.  Maybe a more promising
direction would be to avoid using markers in save-excursion.

In my experience, most save-excursions are used around code which makes
no buffer modifications, in which case plain integers would work just
as well.

So it might be beneficial for save-excursion to be optimistic and use
integers (with some appropriate hooking into maybe
prepare_to_modify_buffer to turn them into markers when needed).

But even there, I'm not sure it would really speed up cc-mode noticeably.


        Stefan



      reply	other threads:[~2013-09-09 19:41 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <E1VGrmg-0000c9-Jm@vcs.savannah.gnu.org>
     [not found] ` <jwvhae1emmw.fsf-monnier+emacs@gnu.org>
2013-09-07  4:37   ` [Emacs-diffs] trunk r114117: * buffer.c (drop_overlay): Dmitry Antipov
2013-09-09 19:41     ` Stefan Monnier [this message]

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