Added count of my_sync calls (to SHOW STATUS)

tmp_table_size can now be set to 0 (to disable in memory internal temp tables)
Improved speed for internal Maria temp tables:
- Don't use packed keys, except with long text fields.
- Don't copy key all accessed pages during key search.
Some new benchmark tests to sql-bench (for group by)

BUILD/compile-pentium64-gcov:
  Update script to use same pentium_config flags as other tests
BUILD/compile-pentium64-gprof:
  Update script to use same pentium_config flags as other tests
include/my_sys.h:
  Added count of my_sync calls
mysql-test/r/variables.result:
  tmp_table_size can now be set to 0
sql-bench/test-select.sh:
  Added some new test for GROUP BY on a not key field and group by with different order by
sql/mysqld.cc:
  Added count of my_sync calls
  tmp_table_size can now be set to 0 (to disable in memory internal temp tables)
sql/sql_select.cc:
  If tmp_table_size is 0, don't use in memory temp tables (good for benchmarking MyISAM/Maria temp tables)
  Don't pack keys for Maria tables;  The 8K page size makes packed keys too slow for temp tables.
storage/maria/ma_key_recover.h:
  Moved definition to maria_def.h
storage/maria/ma_page.c:
  Moved code used to simplify comparing of identical Maria tables to own function (page_cleanup())
  Fixed that one can read a page with a read lock.
storage/maria/ma_rkey.c:
  For not exact key reads, cache the page where we found key (to speed up future read-next/read-prev calls)
storage/maria/ma_search.c:
  Moved code to cache last key page to separate function.
  Instead of copying pages, only get a link to the page. This notable speeds up key searches on bigger tables.
storage/maria/ma_write.c:
  Added comment
storage/maria/maria_def.h:
  Moved page_cleanup() to separate function.

6 files changed, 100 insertions, 44 deletions

diff --git a/storage/maria/ma_key_recover.h b/storage/maria/ma_key_recover.h
index 4b4198f3008..b580433c99a 100644
--- a/storage/maria/ma_key_recover.h
+++ b/storage/maria/ma_key_recover.h
@@ -63,7 +63,6 @@ extern my_bool write_hook_for_undo_key_insert(enum translog_record_type type,
 extern my_bool write_hook_for_undo_key_delete(enum translog_record_type type,
                                               TRN *trn, MARIA_HA *tbl_info,
                                               LSN *lsn, void *hook_arg);
-void _ma_unpin_all_pages(MARIA_HA *info, LSN undo_lsn);
 
 my_bool _ma_log_prefix(MARIA_PAGE *page, uint changed_length, int move_length);
 my_bool _ma_log_suffix(MARIA_PAGE *page, uint org_length,
diff --git a/storage/maria/ma_page.c b/storage/maria/ma_page.c
index 54361b8ee3b..acbee2a6f07 100644
--- a/storage/maria/ma_page.c
+++ b/storage/maria/ma_page.c
@@ -64,6 +64,15 @@ void _ma_page_setup(MARIA_PAGE *page, MARIA_HA *info,
                   share->base.key_reflength : 0);
 }
 
+#ifdef IDENTICAL_PAGES_AFTER_RECOVERY
+void page_cleanup(MARIA_SHARE *share, MARIA_PAGE *page)
+{
+  uint length= page->size;
+  DBUG_ASSERT(length <= block_size - KEYPAGE_CHECKSUM_SIZE);
+  bzero(page->buff + length, share->block_size - length);
+}
+#endif
+
 
 /**
   Fetch a key-page in memory
@@ -102,8 +111,10 @@ my_bool _ma_fetch_keypage(MARIA_PAGE *page, MARIA_HA *info,
 
   if (lock != PAGECACHE_LOCK_LEFT_UNLOCKED)
   {
-    DBUG_ASSERT(lock == PAGECACHE_LOCK_WRITE);
-    page_link.unlock=  PAGECACHE_LOCK_WRITE_UNLOCK;
+    DBUG_ASSERT(lock == PAGECACHE_LOCK_WRITE || PAGECACHE_LOCK_READ);
+    page_link.unlock= (lock == PAGECACHE_LOCK_WRITE ?
+                       PAGECACHE_LOCK_WRITE_UNLOCK :
+                       PAGECACHE_LOCK_READ_UNLOCK);
     page_link.changed= 0;
     push_dynamic(&info->pinned_pages, (void*) &page_link);
     page->link_offset= info->pinned_pages.elements-1;
@@ -209,14 +220,7 @@ my_bool _ma_write_keypage(MARIA_PAGE *page, enum pagecache_page_lock lock,
   }
 #endif
 
-#ifdef IDENTICAL_PAGES_AFTER_RECOVERY
-  {
-    uint length= page->size;
-    DBUG_ASSERT(length <= block_size - KEYPAGE_CHECKSUM_SIZE);
-    bzero(buff + length, block_size - length);
-  }
-#endif
-
+  page_cleanup(share, page);
   res= pagecache_write(share->pagecache,
                        &share->kfile,
                        (pgcache_page_no_t) (page->pos / block_size),
diff --git a/storage/maria/ma_rkey.c b/storage/maria/ma_rkey.c
index 9e529aca666..daf1fd5a60c 100644
--- a/storage/maria/ma_rkey.c
+++ b/storage/maria/ma_rkey.c
@@ -82,6 +82,9 @@ int maria_rkey(MARIA_HA *info, uchar *buf, int inx, const uchar *key_data,
     rw_rdlock(&keyinfo->root_lock);
 
   nextflag= maria_read_vec[search_flag] | key.flag;
+  if (search_flag != HA_READ_KEY_EXACT ||
+      ((keyinfo->flag & (HA_NOSAME | HA_NULL_PART)) != HA_NOSAME))
+    nextflag|= SEARCH_SAVE_BUFF;
 
   switch (keyinfo->key_alg) {
 #ifdef HAVE_RTREE_KEYS
diff --git a/storage/maria/ma_search.c b/storage/maria/ma_search.c
index a50f3c49a26..8df0ebc4bf4 100644
--- a/storage/maria/ma_search.c
+++ b/storage/maria/ma_search.c
@@ -18,6 +18,10 @@
 #include "ma_fulltext.h"
 #include "m_ctype.h"
 
+static int _ma_search_no_save(register MARIA_HA *info, MARIA_KEY *key,
+                              uint32 nextflag, register my_off_t pos,
+                              MARIA_PINNED_PAGE **res_page_link,
+                              uchar **res_page_buff);
 static my_bool _ma_get_prev_key(MARIA_KEY *key, MARIA_PAGE *ma_page,
                                 uchar *keypos);
 
@@ -57,7 +61,51 @@ int _ma_check_index(MARIA_HA *info, int inx)
 */
 
 int _ma_search(register MARIA_HA *info, MARIA_KEY *key, uint32 nextflag,
-               register my_off_t pos)
+               my_off_t pos)
+{
+  int error;
+  MARIA_PINNED_PAGE *page_link;
+  uchar *page_buff;
+
+  info->page_changed= 1;                        /* If page not saved */
+  if (!(error= _ma_search_no_save(info, key, nextflag, pos, &page_link,
+                                  &page_buff)))
+  {
+    if (nextflag & SEARCH_SAVE_BUFF)
+    {
+      bmove512(info->keyread_buff, page_buff, info->s->block_size);
+
+      /* Save position for a possible read next / previous */
+      info->int_keypos= info->keyread_buff + (ulonglong) info->int_keypos;
+      info->int_maxpos= info->keyread_buff + (ulonglong) info->int_maxpos;
+      info->int_keytree_version= key->keyinfo->version;
+      info->last_search_keypage= info->last_keypage;
+      info->page_changed= 0;
+      info->keyread_buff_used= 0;
+    }
+  }
+  _ma_unpin_all_pages(info, LSN_IMPOSSIBLE);
+  return (error);
+}
+
+/**
+   @breif Search after row by a key
+
+   ret_page_link	Will contain pointer to page where we found key
+
+   @note
+     Position to row is stored in info->lastpos
+
+   @return
+   @retval  0   ok (key found)
+   @retval -1   Not found
+   @retval  1   If one should continue search on higher level
+*/
+
+static int _ma_search_no_save(register MARIA_HA *info, MARIA_KEY *key,
+                              uint32 nextflag, register my_off_t pos,
+                              MARIA_PINNED_PAGE **res_page_link,
+                              uchar **res_page_buff)
 {
   my_bool last_key_not_used;
   int error,flag;
@@ -66,6 +114,7 @@ int _ma_search(register MARIA_HA *info, MARIA_KEY *key, uint32 nextflag,
   uchar lastkey[MARIA_MAX_KEY_BUFF];
   MARIA_KEYDEF *keyinfo= key->keyinfo;
   MARIA_PAGE page;
+  MARIA_PINNED_PAGE *page_link;
   DBUG_ENTER("_ma_search");
   DBUG_PRINT("enter",("pos: %lu  nextflag: %u  lastpos: %lu",
                       (ulong) pos, nextflag, (ulong) info->cur_row.lastpos));
@@ -81,10 +130,11 @@ int _ma_search(register MARIA_HA *info, MARIA_KEY *key, uint32 nextflag,
   }
 
   if (_ma_fetch_keypage(&page, info, keyinfo, pos,
-                        PAGECACHE_LOCK_LEFT_UNLOCKED,
-                        DFLT_INIT_HITS, info->keyread_buff,
-                        test(!(nextflag & SEARCH_SAVE_BUFF))))
+                        PAGECACHE_LOCK_READ, DFLT_INIT_HITS, 0, 0))
     goto err;
+  page_link= dynamic_element(&info->pinned_pages,
+                             info->pinned_pages.elements-1,
+                             MARIA_PINNED_PAGE*);
   DBUG_DUMP("page", page.buff, page.size);
 
   flag= (*keyinfo->bin_search)(key, &page, nextflag, &keypos, lastkey,
@@ -98,8 +148,9 @@ int _ma_search(register MARIA_HA *info, MARIA_KEY *key, uint32 nextflag,
 
   if (flag)
   {
-    if ((error= _ma_search(info, key, nextflag,
-                          _ma_kpos(nod_flag,keypos))) <= 0)
+    if ((error= _ma_search_no_save(info, key, nextflag,
+                                   _ma_kpos(nod_flag,keypos),
+                                   res_page_link, res_page_buff)) <= 0)
       DBUG_RETURN(error);
 
     if (flag >0)
@@ -118,26 +169,15 @@ int _ma_search(register MARIA_HA *info, MARIA_KEY *key, uint32 nextflag,
 	((keyinfo->flag & (HA_NOSAME | HA_NULL_PART)) != HA_NOSAME ||
 	 (key->flag & SEARCH_PART_KEY) || info->s->base.born_transactional))
     {
-      if ((error= _ma_search(info, key, (nextflag | SEARCH_FIND) &
-                             ~(SEARCH_BIGGER | SEARCH_SMALLER | SEARCH_LAST),
-                             _ma_kpos(nod_flag,keypos))) >= 0 ||
+      if ((error= _ma_search_no_save(info, key, (nextflag | SEARCH_FIND) &
+                                     ~(SEARCH_BIGGER | SEARCH_SMALLER |
+                                       SEARCH_LAST),
+                                     _ma_kpos(nod_flag,keypos),
+                                     res_page_link, res_page_buff)) >= 0 ||
           my_errno != HA_ERR_KEY_NOT_FOUND)
         DBUG_RETURN(error);
-      info->last_keypage= HA_OFFSET_ERROR;              /* Buffer not in mem */
     }
   }
-  if (pos != info->last_keypage)
-  {
-    uchar *old_buff= page.buff;
-    if (_ma_fetch_keypage(&page, info, keyinfo, pos,
-                          PAGECACHE_LOCK_LEFT_UNLOCKED,DFLT_INIT_HITS,
-                          info->keyread_buff,
-                          test(!(nextflag & SEARCH_SAVE_BUFF))))
-      goto err;
-    /* Restore position if page buffer moved */
-    keypos= page.buff + (keypos - old_buff);
-    maxpos= page.buff + (maxpos - old_buff);
-  }
 
   info->last_key.keyinfo= keyinfo;
   if ((nextflag & (SEARCH_SMALLER | SEARCH_LAST)) && flag != 0)
@@ -172,16 +212,15 @@ int _ma_search(register MARIA_HA *info, MARIA_KEY *key, uint32 nextflag,
   }
   info->cur_row.lastpos= _ma_row_pos_from_key(&info->last_key);
   info->cur_row.trid=    _ma_trid_from_key(&info->last_key);
-  /* Save position for a possible read next / previous */
-  info->int_keypos= info->keyread_buff + (keypos - page.buff);
-  info->int_maxpos= info->keyread_buff + (maxpos - page.buff);
-  info->int_nod_flag=nod_flag;
-  info->int_keytree_version=keyinfo->version;
-  info->last_search_keypage=info->last_keypage;
-  info->page_changed=0;
-  /* Set marker that buffer was used (Marker for mi_search_next()) */
-  info->keyread_buff_used= (info->keyread_buff != page.buff);
 
+  /* Store offset to key */
+  info->int_keypos= (uchar*) (keypos - page.buff);
+  info->int_maxpos= (uchar*) (maxpos - page.buff);
+  info->int_nod_flag= nod_flag;
+  info->last_keypage= pos;
+  *res_page_link= page_link;
+  *res_page_buff= page.buff;
+  
   DBUG_PRINT("exit",("found key at %lu",(ulong) info->cur_row.lastpos));
   DBUG_RETURN(0);
 
@@ -190,7 +229,7 @@ err:
   info->cur_row.lastpos= HA_OFFSET_ERROR;
   info->page_changed=1;
   DBUG_RETURN (-1);
-} /* _ma_search */
+}
 
 
 /*
diff --git a/storage/maria/ma_write.c b/storage/maria/ma_write.c
index 20304618229..3b9ca46899f 100644
--- a/storage/maria/ma_write.c
+++ b/storage/maria/ma_write.c
@@ -587,6 +587,12 @@ my_bool _ma_enlarge_root(MARIA_HA *info, MARIA_KEY *key, my_off_t *root)
 /*
   Search after a position for a key and store it there
 
+  TODO:
+  Change this to use pagecache directly instead of creating a copy
+  of the page. To do this, we must however change write-key-on-page
+  algorithm to not overwrite the buffer but instead store any overflow
+  key in a separate buffer.
+
   @return
   @retval -1   error
   @retval 0    ok
diff --git a/storage/maria/maria_def.h b/storage/maria/maria_def.h
index 1d60beece6b..29eb32a4fb2 100644
--- a/storage/maria/maria_def.h
+++ b/storage/maria/maria_def.h
@@ -979,6 +979,11 @@ extern ulonglong transid_get_packed(MARIA_SHARE *share, const uchar *from);
 #define page_store_info(share, page)                           \
   _ma_store_keypage_flag((share), (page)->buff, (page)->flag); \
   _ma_store_page_used((share), (page)->buff, (page)->size);
+#ifdef IDENTICAL_PAGES_AFTER_RECOVERY
+void page_cleanup(MARIA_SHARE *share, MARIA_PAGE *page)
+#else
+#define page_cleanup(A,B) while (0)
+#endif
 
 extern MARIA_KEY *_ma_make_key(MARIA_HA *info, MARIA_KEY *int_key, uint keynr,
                                uchar *key, const uchar *record,
@@ -1197,7 +1202,7 @@ void _ma_tmp_disable_logging_for_table(MARIA_HA *info,
                                        my_bool log_incomplete);
 my_bool _ma_reenable_logging_for_table(MARIA_HA *info, my_bool flush_pages);
 my_bool write_log_record_for_bulk_insert(MARIA_HA *info);
-
+void _ma_unpin_all_pages(MARIA_HA *info, LSN undo_lsn);
 
 #define MARIA_NO_CRC_NORMAL_PAGE 0xffffffff
 #define MARIA_NO_CRC_BITMAP_PAGE 0xfffffffe