svn propchange: r1390435 - svn:log

[st...@apache.org]

Author: stefan2
Revision: 1390435
Modified property: svn:log

Modified: svn:log at Thu Sep 27 12:55:54 2012
------------------------------------------------------------------------------
--- svn:log (original)
+++ svn:log Thu Sep 27 12:55:54 2012
@@ -1,5 +1,85 @@
 Merge first batch of changes from the 10Gb branch. These are all
 internal optimizations, i.e. no UI or public API changes.
 
-Revisions 1388394,1388636,1388639,1388643-1388644,1388654,1388720,
-1388789,1388795,1388801,1388805,1388810,1389276,1390407
+This comprises the following change sets:
+
+* Make membuffer cache keep more of the "important" objects.
+  The /trunk code has flaws and inefficiencies that prevent
+  the cache from keeping as much data as it could.
+
+  [subversion/libsvn_subr/cache-membuffer.c]
+  r1388810: improve cache retention rate in overload situations.
+  r1390407: fix a membuffer cache effectiveness issue. The 
+            lower part of the group index was always identical
+            to the cache segment index. I.e. most groups would
+            not be used at all causing the used ones to overflow
+            quickly.
+
+* Add a 1st level cache for DAG nodes that can just hand out
+  the nodes without the need to (de-)serialize, copy or sync data.
+
+  The actual implementation can be found here:
+
+  [subversion/libsvn_fs_fs/fs.h
+   subversion/libsvn_fs_fs/tree.h
+   subversion/libsvn_fs_fs/caching.c
+   subversion/libsvn_fs_fs/tree.c]
+  r1388654: Implement a 1st level cache for DAG nodes as they are
+            the most frequently accessed data object in FSFS. 
+            Also, access to them tends to have high locality.
+  r1388801: Make 1st level DAG node cache more effective. We may
+            attempt lookups with *any* non-empty path.  
+
+  Supporting changes and additions:
+
+  [subversion/tests/libsvn_fs/fs-test.c
+   subversion/include/private/svn_fs_util.h
+   subversion/libsvn_fs_util/fs-util.c
+   subversion/libsvn_fs_fs/tree.c]
+  r1388636: Fix a pool usage issue in fs-test.
+  r1388644: Introduce a new utility method that determines whether
+            svn_fs__canonicalize_abspath must be called for a given
+            path.
+  r1389276: prevent unnecessary canonicalization.
+
+* Checkout, export and update often send deltas against empty bases.
+  Provide an optimized implementation for that case and invoke it
+  from the generic window_handler().
+
+  [subversion/libsvn_delta/svndiff.c]
+  r1388394: provide optimized version of window_handler for the
+            frequent case of an empty source window.
+  r1388805: make the optimized code path for deltas against empty
+            source stream handle all headers and write them with a
+            single call to the output stream.
+
+* Speed up the reporting of properties in similar cases.
+
+  [subversion/libsvn_repos/reporter.c]
+  r1388795: When reporting changed properties against an empty
+            source or a source with no properties,  there is no
+            need for calculating a diff between both lists.
+            Also, reduce general computational overhead.
+
+* Speed up cache access by using fixed-size keys.
+
+  [subversion/libsvn_fs_fs/fs.h
+   subversion/libsvn_fs_fs/caching.c
+   subversion/libsvn_fs_fs/fs_fs.c]
+  r1388720: instead of variable length keys use fixed length structs
+            as keys for the revprop and fulltext caches.  Those keys
+            don't require intermediate strings to be constructed and
+            are faster to process on the cache side.
+
+* Introduce a node property cache (similar to any other cache
+  in FSFS).
+
+  [subversion/libsvn_fs_fs/fs.h
+   subversion/libsvn_fs_fs/caching.c
+   subversion/libsvn_fs_fs/fs_fs.c]
+  r1388789: Cache node properties in their parsed state instead
+            of just the plain full-text. temp_(de-)serialization
+            is much faster then parsing from a generic stream.
+
+* [subversion/libsvn_fs_fs/fs_fs.c]
+  r1388639: minor optimization.