Add indirection counting to speed up Fkill_buffer.

* buffer.h (struct buffer): New member.
* buffer.c (Fget_buffer_create): Set indirection counter to 0.
(Fmake_indirect_buffer): Set indirection counter to -1, increment
base buffer indirection counter.
(compact_buffer): If ENABLE_CHECKING, verify indirection counters.
(Fkill_buffer): Adjust indirection counters as needed, don't walk
through buffer list if indirection counter is 0.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index d7d02a2262a..e90e48ee9dc 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,16 @@
 2012-07-20  Dmitry Antipov  <dmantipov@yandex.ru>
 
+        Add indirection counting to speed up Fkill_buffer.
+        * buffer.h (struct buffer): New member.
+        * buffer.c (Fget_buffer_create): Set indirection counter to 0.
+        (Fmake_indirect_buffer): Set indirection counter to -1, increment
+        base buffer indirection counter.
+        (compact_buffer): If ENABLE_CHECKING, verify indirection counters.
+        (Fkill_buffer): Adjust indirection counters as needed, don't walk
+        through buffer list if indirection counter is 0.
+
+2012-07-20  Dmitry Antipov  <dmantipov@yandex.ru>
+
         Extend the value returned by Fgarbage_collect with heap statistics.
         * alloc.c (Qheap): New symbol.
         (syms_of_alloc): DEFSYM it.