From: Dmitry Antipov <antipov@dev.rtsoft.ru>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 16830@debbugs.gnu.org
Subject: bug#16830: Re: bug#16830: [Bug] 24.3.50; massive slow down in forward-line
Date: Mon, 17 Mar 2014 19:05:27 +0400 [thread overview]
Message-ID: <53270F37.1010904@dev.rtsoft.ru> (raw)
In-Reply-To: <83txb5op81.fsf@gnu.org>
[-- Attachment #1: Type: text/plain, Size: 645 bytes --]
On 03/10/2014 10:58 PM, Eli Zaretskii wrote:
> It would be nice to be able to turn the cache on and off dynamically,
> depending on the actual line length of the buffer. I tried to
> implement this, but my naive implementation didn't work well, because
> sampling of the lines tends to be extremely un-representative. If
> someone can come up with a smarter implementation, please show it.
What if we just maintain the '\n' counter per each buffer text?
With that, finding an average line length is straightforward,
and the very basic implementation looks fairly simple; this
should be helpful in maintaining newline_cache as well.
Dmitry
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: nl.patch --]
[-- Type: text/x-patch; name="nl.patch", Size: 4917 bytes --]
=== modified file 'src/buffer.c'
--- src/buffer.c 2014-03-15 11:16:12 +0000
+++ src/buffer.c 2014-03-17 14:42:01 +0000
@@ -573,6 +573,7 @@
BUF_END_UNCHANGED (b) = 0;
BUF_BEG_UNCHANGED (b) = 0;
*(BUF_GPT_ADDR (b)) = *(BUF_Z_ADDR (b)) = 0; /* Put an anchor '\0'. */
+ BUF_NL (b) = 0;
b->text->inhibit_shrinking = false;
b->text->redisplay = false;
=== modified file 'src/buffer.h'
--- src/buffer.h 2014-01-01 07:43:34 +0000
+++ src/buffer.h 2014-03-17 14:42:01 +0000
@@ -91,6 +91,9 @@
/* Modification count as of last visit or save. */
#define SAVE_MODIFF (current_buffer->text->save_modiff)
+/* How many '\n' in the buffer. */
+#define NL (current_buffer->text->nl)
+
/* BUFFER_CEILING_OF (resp. BUFFER_FLOOR_OF), when applied to n, return
the max (resp. min) p such that
@@ -183,6 +186,9 @@
/* FIXME: should we move this into ->text->auto_save_modiff? */
#define BUF_AUTOSAVE_MODIFF(buf) ((buf)->auto_save_modified)
+/* How many '\n' in the buffer. */
+#define BUF_NL(buf) ((buf)->text->nl)
+
/* Compaction count. */
#define BUF_COMPACT(buf) ((buf)->text->compact)
@@ -463,6 +469,9 @@
/* Properties of this buffer's text. */
INTERVAL intervals;
+ /* How many '\n' in this buffer's text. */
+ ptrdiff_t nl;
+
/* The markers that refer to this buffer.
This is actually a single marker ---
successive elements in its marker `chain'
=== modified file 'src/insdel.c'
--- src/insdel.c 2014-01-01 17:44:48 +0000
+++ src/insdel.c 2014-03-17 14:55:57 +0000
@@ -560,7 +560,20 @@
return to_addr - initial_to_addr;
}
}
-\f
+
+/* Count '\n' in [PTR..PTR + NBYTES). */
+
+static ptrdiff_t
+count_newlines (const char *ptr, ptrdiff_t nbytes)
+{
+ const char *p = ptr;
+ ptrdiff_t count = 0, restbytes = nbytes;
+
+ while (restbytes > 0 && (p = memchr (p, '\n', restbytes)))
+ p++, count++, restbytes = nbytes - (p - ptr);
+ return count;
+}
+
/* Insert a string of specified length before point.
This function judges multibyteness based on
enable_multibyte_characters in the current buffer;
@@ -814,6 +827,9 @@
MODIFF++;
CHARS_MODIFF = MODIFF;
+ /* Count newlines in new text. */
+ NL += count_newlines (string, nbytes);
+
memcpy (GPT_ADDR, string, nbytes);
GAP_SIZE -= nbytes;
@@ -924,6 +940,9 @@
make_gap (outgoing_nbytes - GAP_SIZE);
UNGCPRO;
+ /* Count newlines in string text. */
+ NL += count_newlines (SSDATA (string) + pos_byte, nbytes);
+
/* Copy the string text into the buffer, perhaps converting
between single-byte and multibyte. */
copy_text (SDATA (string) + pos_byte, GPT_ADDR, nbytes,
@@ -1001,6 +1020,11 @@
record_insert (GPT, nchars);
MODIFF++;
+ /* Add newlines from new text. */
+ NL += count_newlines (text_at_gap_tail
+ ? (char *) GAP_END_ADDR - nbytes
+ : (char *) GPT_ADDR, nbytes);
+
GAP_SIZE -= nbytes;
if (! text_at_gap_tail)
{
@@ -1138,6 +1162,9 @@
emacs_abort ();
#endif
+ /* Add newlines from gap. */
+ NL += count_newlines ((char *) GPT_ADDR, outgoing_nbytes);
+
record_insert (PT, nchars);
MODIFF++;
CHARS_MODIFF = MODIFF;
@@ -1340,6 +1367,9 @@
combining. */
if (! EQ (BVAR (current_buffer, undo_list), Qt))
deletion = make_buffer_string_both (from, from_byte, to, to_byte, 1);
+
+ /* Do not count newlines from deleted text any more. */
+ NL -= count_newlines ((char *) BYTE_POS_ADDR (from_byte), nbytes_del);
GAP_SIZE += nbytes_del;
ZV -= nchars_del;
@@ -1360,6 +1390,9 @@
if (GAP_SIZE < outgoing_insbytes)
make_gap (outgoing_insbytes - GAP_SIZE);
+ /* Add newlines from string text. */
+ NL += count_newlines (SSDATA (new), insbytes);
+
/* Copy the string text into the buffer, perhaps converting
between single-byte and multibyte. */
copy_text (SDATA (new), GPT_ADDR, insbytes,
@@ -1470,6 +1503,9 @@
if (to < GPT)
gap_left (to, to_byte, 0);
+ /* Do not count newlines from deleted text any more. */
+ NL -= count_newlines ((char *) BYTE_POS_ADDR (from_byte), nbytes_del);
+
GAP_SIZE += nbytes_del;
ZV -= nchars_del;
Z -= nchars_del;
@@ -1489,6 +1525,9 @@
if (GAP_SIZE < insbytes)
make_gap (insbytes - GAP_SIZE);
+ /* Add newlines from replacement text. */
+ NL += count_newlines (ins, insbytes);
+
/* Copy the replacement text into the buffer. */
memcpy (GPT_ADDR, ins, insbytes);
@@ -1737,6 +1776,9 @@
adjusting the markers that bound the overlays. */
adjust_overlays_for_delete (from, nchars_del);
+ /* Do not count newlines from deleted text any more. */
+ NL -= count_newlines ((char *) BYTE_POS_ADDR (from_byte), nbytes_del);
+
GAP_SIZE += nbytes_del;
ZV_BYTE -= nbytes_del;
Z_BYTE -= nbytes_del;
next prev parent reply other threads:[~2014-03-17 15:05 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-21 12:16 bug#16830: [Bug] 24.3.50; massive slow down in forward-line Stefan-W. Hahn
2014-02-21 12:32 ` Eli Zaretskii
2014-02-21 15:51 ` Stefan-W. Hahn
2014-02-21 17:50 ` Stefan Monnier
2014-02-22 8:38 ` Stefan-W. Hahn
[not found] ` <20140222083926.GC27381@pille.home>
2014-02-22 9:18 ` Eli Zaretskii
2014-02-22 11:08 ` Stefan-W. Hahn
2014-02-22 11:29 ` Eli Zaretskii
2014-02-22 11:36 ` Eli Zaretskii
2014-02-22 12:33 ` Stefan-W. Hahn
2014-02-22 12:55 ` Juanma Barranquero
2014-02-22 15:06 ` Stefan-W. Hahn
2014-02-22 13:05 ` Eli Zaretskii
2014-02-21 7:43 ` Stefan-W. Hahn
2014-02-23 18:04 ` Eli Zaretskii
2014-02-22 12:27 ` Stefan-W. Hahn
2014-03-10 18:58 ` Eli Zaretskii
2014-03-11 8:08 ` martin rudalics
2014-03-11 17:03 ` Eli Zaretskii
2014-03-12 14:12 ` Stefan Monnier
2014-03-16 16:32 ` Eli Zaretskii
2014-03-17 15:05 ` Dmitry Antipov [this message]
2014-03-17 16:39 ` Eli Zaretskii
2014-06-22 16:50 ` Eli Zaretskii
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