From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Mon, 20 Feb 2017 19:05:41 +0000 (-0500)
Subject: * src/insdel.c (make_gap): Improve comment.
X-Git-Tag: emacs-26.0.90~758
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=160bcfeed6047b65cf8b9f00c404061b03dfe141;p=emacs.git

* src/insdel.c (make_gap): Improve comment.
---

diff --git a/src/insdel.c b/src/insdel.c
index 76af3ff9a4c..5a95d41e7ab 100644
--- a/src/insdel.c
+++ b/src/insdel.c
@@ -572,7 +572,9 @@ make_gap (ptrdiff_t nbytes_added)
      * With /4096 => 131s
      * With /∞    => gave up after 858s
      * Of couse, ideally we should never call set-buffer-multibyte on
-     * a non-empty buffer (e.g. use buffer-swa-text instead).  */
+     * a non-empty buffer (e.g. use buffer-swap-text instead).
+     * We chose /64 because it already brings almost the best performance while
+     * limiting the potential wasted memory to 1.5%.  */
     make_gap_larger (max (nbytes_added, (Z - BEG) / 64));
 #if defined USE_MMAP_FOR_BUFFERS || defined REL_ALLOC || defined DOUG_LEA_MALLOC
   else