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Re: Your Emacs changes
From: |
Dmitry Antipov |
Subject: |
Re: Your Emacs changes |
Date: |
Tue, 21 Aug 2007 18:42:20 +0400 |
User-agent: |
Thunderbird 2.0.0.5 (X11/20070719) |
Richard Stallman wrote:
Now that we have your papers, what changes should we install now?
Probably the thing described at
http://lists.gnu.org/archive/html/emacs-devel/2007-07/msg00094.html.
Attached is the latest stuff on this.
Note the same optimization may be performed on sweeping floats. But, since an
amount of allocated
floats is too small in comparison with conses, an effect is expected to be very
negligible.
Dmitry
Index: alloc.c
===================================================================
RCS file: /sources/emacs/emacs/src/alloc.c,v
retrieving revision 1.414
diff -u -r1.414 alloc.c
--- alloc.c 19 Aug 2007 00:15:26 -0000 1.414
+++ alloc.c 21 Aug 2007 14:31:37 -0000
@@ -5974,23 +5974,53 @@
for (cblk = cons_block; cblk; cblk = *cprev)
{
- register int i;
+ register int i = 0;
int this_free = 0;
- for (i = 0; i < lim; i++)
- if (!CONS_MARKED_P (&cblk->conses[i]))
- {
- this_free++;
- cblk->conses[i].u.chain = cons_free_list;
- cons_free_list = &cblk->conses[i];
+
+ while (1)
+ {
+ if (cblk->gcmarkbits[i] == -1)
+ {
+ /* Fast path - everything is marked. */
+ cblk->gcmarkbits[i++] = 0;
+ num_used += BITS_PER_INT;
+ }
+ else
+ {
+ /* Slow path - scan over each bit, from the beginning
+ of current word to 'min (word boundary, LIM)'. */
+ int start, stop;
+
+ start = i * BITS_PER_INT;
+ stop = lim - start;
+ if (stop > BITS_PER_INT)
+ stop = BITS_PER_INT;
+ stop += start;
+
+ while (start < stop)
+ {
+ if (!CONS_MARKED_P (&cblk->conses[start]))
+ {
+ this_free++;
+ cblk->conses[start].u.chain = cons_free_list;
+ cons_free_list = &cblk->conses[start];
#if GC_MARK_STACK
- cons_free_list->car = Vdead;
+ cons_free_list->car = Vdead;
#endif
- }
- else
- {
- num_used++;
- CONS_UNMARK (&cblk->conses[i]);
- }
+ }
+ else
+ {
+ num_used++;
+ CONS_UNMARK (&cblk->conses[start]);
+ }
+ start++;
+ }
+ if (stop < (++i) * BITS_PER_INT)
+ /* Whole bitmap is scanned or LIM is reached. */
+ break;
+ }
+ }
+
lim = CONS_BLOCK_SIZE;
/* If this block contains only free conses and we have already
seen more than two blocks worth of free conses then deallocate
- Re: Your Emacs changes,
Dmitry Antipov <=