From: dan <dan@noemail.net>
Date: Wed, 6 Jul 2016 10:12:02 +0000 (+0000)
Subject: Add the SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED sqlite3_db_status() parameter.
X-Git-Tag: version-3.14.0~77^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=272989b44d0a5d40d8e11481afc32d811b003537;p=thirdparty%2Fsqlite.git

Add the SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED sqlite3_db_status() parameter.

FossilOrigin-Name: 118321c8b9d88b8f439c952436f42838c3fc80cb
---

diff --git a/manifest b/manifest
index 2ae741da57..662bd8b161 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sa\smemory\sleak\sin\srecently\sadded\stest\scode.
-D 2016-07-06T09:19:14.702
+C Add\sthe\sSQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED\ssqlite3_db_status()\sparameter.
+D 2016-07-06T10:12:02.240
 F Makefile.in 6c20d44f72d4564f11652b26291a214c8367e5db
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc d66d0395c38571aab3804f8db0fa20707ae4609a
@@ -327,8 +327,8 @@ F src/auth.c b56c78ebe40a2110fd361379f7e8162d23f92240
 F src/backup.c 6df65fdd569c901a418887a1a76f82ec35044556
 F src/bitvec.c 3ee4c8b2c94ed3a7377256e18199e6ff5cf33f63
 F src/btmutex.c bc87dd3b062cc26edfe79918de2200ccb8d41e73
-F src/btree.c 0621247619df15790f7ed5f14926cfb3925c10b1
-F src/btree.h 2107a2630e02c8cba58bb12ce14e731e734ea29c
+F src/btree.c dc4e5f3e95fd57b610422e36e0913662ecd6814c
+F src/btree.h aee84823bb383d6ae3728b068f9130d2b36b71eb
 F src/btreeInt.h c18b7d2a3494695133e4e60ee36061d37f45d9a5
 F src/build.c d1fdfd7ab8f5447e494ef15825973bf0719527c6
 F src/callback.c 2e76147783386374bf01b227f752c81ec872d730
@@ -385,12 +385,12 @@ F src/resolve.c cca3aa77b95706df5d635a2141a4d1de60ae6598
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
 F src/select.c f3c6e9065fb34f6a23af27ec7f1f717ffbfc2ee4
 F src/shell.c 14ff7f660530a52b117d110ba3390b7b2eb719b6
-F src/sqlite.h.in 5f8113dbec74c6c093ead9930afb8c9fbd9f643d
+F src/sqlite.h.in 801a34f86508662fbfc8e014f03ccf0c8bef0b4c
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 98f72cbfe00169c39089115427d06ea05fe4b4a2
 F src/sqliteInt.h 2ac73e9fdd138f4607139d9bd6a1e6dcd01837dc
 F src/sqliteLimit.h c0373387c287c8d0932510b5547ecde31b5da247
-F src/status.c 70912d7be68e9e2dbc4010c93d344af61d4c59ba
+F src/status.c d92daea3bb48023da57931719f2a2784f5487c0b
 F src/table.c 5226df15ab9179b9ed558d89575ea0ce37b03fc9
 F src/tclsqlite.c 25fbbbb97f76dbfd113153fb63f52d7ecfac5dd0
 F src/test1.c 08faa045c45b1d3f62c28c93cae955f518317f68
@@ -419,7 +419,7 @@ F src/test_intarray.c 870124b95ec4c645d4eb84f15efb7133528fb1a5
 F src/test_intarray.h 9dc57417fb65bc7835cc18548852cc08cc062202
 F src/test_journal.c d3b83f2bcb7792c709e57abddc456a2b1818643a
 F src/test_loadext.c 337056bae59f80b9eb00ba82088b39d0f4fe6dfd
-F src/test_malloc.c 94c18e88d6df6d471a0d04ddb809f833d1739950
+F src/test_malloc.c 20954ab49e09be3433c8d2fd7a8bd0a0f1c76de7
 F src/test_multiplex.c eafc567ebe162e36f17b5062285dfe90461cf8e9
 F src/test_multiplex.h c08e4e8f8651f0c5e0509b138ff4d5b43ed1f5d3
 F src/test_mutex.c dbdfaff8580071f2212a0deae3325a93a737819c
@@ -621,7 +621,7 @@ F test/ctime.test 0b995accd44a52914bd4744d5c1b6e1a56c7897c
 F test/cursorhint.test 7bc346788390475e77a345da2b92270d04d35856
 F test/cursorhint2.test 2b45341d32d1aae9991a00ef31ebca339b274255
 F test/date.test 984ac1e3e5e031386866f034006148d3972b4a65
-F test/dbstatus.test 8de104bb5606f19537d23cd553b41349b5ab1204
+F test/dbstatus.test c0c8752043074ab6479d2560341ae02f072ad3b9
 F test/dbstatus2.test e93ab03bfae6d62d4d935f20de928c19ca0ed0ab
 F test/default.test 0cb49b1c315a0d81c81d775e407f66906a2a604d
 F test/delete.test e1bcdf8926234e27aac24b346ad83d3329ec8b6f
@@ -1504,7 +1504,10 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 2683b375ad1291172fdb47d94e16fcf869c78c8a
-R bad3fed306e6177658099344318135b4
+P 724e4cdc25fc80b8face57b3398cd338994fb23c
+R 266d0a5d75bc1363b05e057e04a42c8c
+T *branch * dbstatus-prop-cache-used
+T *sym-dbstatus-prop-cache-used *
+T -sym-trunk *
 U dan
-Z b779329b8bc265169140036a21a84f9f
+Z d4bd876af7d67d4b270c7d6acc73f5f1
diff --git a/manifest.uuid b/manifest.uuid
index 457a7b2b76..412e8ccbff 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-724e4cdc25fc80b8face57b3398cd338994fb23c
\ No newline at end of file
+118321c8b9d88b8f439c952436f42838c3fc80cb
\ No newline at end of file
diff --git a/src/btree.c b/src/btree.c
index f37199276f..7fc9193dc8 100644
--- a/src/btree.c
+++ b/src/btree.c
@@ -2337,9 +2337,9 @@ int sqlite3BtreeOpen(
 #if !defined(SQLITE_OMIT_SHARED_CACHE) && !defined(SQLITE_OMIT_DISKIO)
     /* Add the new BtShared object to the linked list sharable BtShareds.
     */
+    pBt->nRef = 1;
     if( p->sharable ){
       MUTEX_LOGIC( sqlite3_mutex *mutexShared; )
-      pBt->nRef = 1;
       MUTEX_LOGIC( mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);)
       if( SQLITE_THREADSAFE && sqlite3GlobalConfig.bCoreMutex ){
         pBt->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_FAST);
@@ -2410,6 +2410,7 @@ btree_open_out:
     assert( sqlite3_mutex_held(mutexOpen) );
     sqlite3_mutex_leave(mutexOpen);
   }
+  assert( rc!=SQLITE_OK || sqlite3BtreeConnectionCount(*ppBtree)>0 );
   return rc;
 }
 
@@ -9698,4 +9699,14 @@ int sqlite3HeaderSizeBtree(void){ return ROUND8(sizeof(MemPage)); }
 int sqlite3BtreeSharable(Btree *p){
   return p->sharable;
 }
+
+/*
+** Return the number of connections to the BtShared object accessed by
+** the Btree handle passed as the only argument. For private caches 
+** this is always 1. For shared caches it may be 1 or greater.
+*/
+int sqlite3BtreeConnectionCount(Btree *p){
+  testcase( p->sharable );
+  return p->pBt->nRef;
+}
 #endif
diff --git a/src/btree.h b/src/btree.h
index 5720df90f7..c8b293ef17 100644
--- a/src/btree.h
+++ b/src/btree.h
@@ -328,11 +328,13 @@ void sqlite3BtreeCursorList(Btree*);
   void sqlite3BtreeEnterAll(sqlite3*);
   int sqlite3BtreeSharable(Btree*);
   void sqlite3BtreeEnterCursor(BtCursor*);
+  int sqlite3BtreeConnectionCount(Btree*);
 #else
 # define sqlite3BtreeEnter(X) 
 # define sqlite3BtreeEnterAll(X)
 # define sqlite3BtreeSharable(X) 0
 # define sqlite3BtreeEnterCursor(X)
+# define sqlite3BtreeConnectionCount(X) 1
 #endif
 
 #if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE
diff --git a/src/sqlite.h.in b/src/sqlite.h.in
index 4865f18132..e1d16008f9 100644
--- a/src/sqlite.h.in
+++ b/src/sqlite.h.in
@@ -6765,6 +6765,18 @@ int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int resetFlg);
 ** memory used by all pager caches associated with the database connection.)^
 ** ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_USED is always 0.
 **
+** [[SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED]] 
+** ^(<dt>SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED</dt>
+** <dd>This parameter is similar to DBSTATUS_CACHE_USED, except that if a
+** pager cache is shared between two or more connections the bytes of heap
+** memory used by that pager cache is divided evenly between the attached
+** connections.)^  In other words, if none of the pager caches associated
+** with the database connection are shared, this request returns the same
+** value as DBSTATUS_CACHE_USED. Or, if one or more or the pager caches are
+** shared, the value returned by this call will be smaller than that returned
+** by DBSTATUS_CACHE_USED. ^The highwater mark associated with
+** SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED is always 0.
+**
 ** [[SQLITE_DBSTATUS_SCHEMA_USED]] ^(<dt>SQLITE_DBSTATUS_SCHEMA_USED</dt>
 ** <dd>This parameter returns the approximate number of bytes of heap
 ** memory used to store the schema for all databases associated
@@ -6822,7 +6834,8 @@ int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int resetFlg);
 #define SQLITE_DBSTATUS_CACHE_MISS           8
 #define SQLITE_DBSTATUS_CACHE_WRITE          9
 #define SQLITE_DBSTATUS_DEFERRED_FKS        10
-#define SQLITE_DBSTATUS_MAX                 10   /* Largest defined DBSTATUS */
+#define SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED 11
+#define SQLITE_DBSTATUS_MAX                 11   /* Largest defined DBSTATUS */
 
 
 /*
diff --git a/src/status.c b/src/status.c
index 69f92ff7c6..bf336dfb46 100644
--- a/src/status.c
+++ b/src/status.c
@@ -219,6 +219,7 @@ int sqlite3_db_status(
     ** by all pagers associated with the given database connection.  The
     ** highwater mark is meaningless and is returned as zero.
     */
+    case SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED:
     case SQLITE_DBSTATUS_CACHE_USED: {
       int totalUsed = 0;
       int i;
@@ -227,7 +228,11 @@ int sqlite3_db_status(
         Btree *pBt = db->aDb[i].pBt;
         if( pBt ){
           Pager *pPager = sqlite3BtreePager(pBt);
-          totalUsed += sqlite3PagerMemUsed(pPager);
+          int nByte = sqlite3PagerMemUsed(pPager);
+          if( op==SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED ){
+            nByte = nByte / sqlite3BtreeConnectionCount(pBt);
+          }
+          totalUsed += nByte;
         }
       }
       sqlite3BtreeLeaveAll(db);
diff --git a/src/test_malloc.c b/src/test_malloc.c
index e6be663998..db34924e6b 100644
--- a/src/test_malloc.c
+++ b/src/test_malloc.c
@@ -1417,7 +1417,8 @@ static int test_db_status(
     { "CACHE_HIT",           SQLITE_DBSTATUS_CACHE_HIT           },
     { "CACHE_MISS",          SQLITE_DBSTATUS_CACHE_MISS          },
     { "CACHE_WRITE",         SQLITE_DBSTATUS_CACHE_WRITE         },
-    { "DEFERRED_FKS",        SQLITE_DBSTATUS_DEFERRED_FKS        }
+    { "DEFERRED_FKS",        SQLITE_DBSTATUS_DEFERRED_FKS        },
+    { "PROPORTIONAL_CACHE_USED", SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED },
   };
   Tcl_Obj *pResult;
   if( objc!=4 ){
diff --git a/test/dbstatus.test b/test/dbstatus.test
index 368c6b28e5..fb839b8f13 100644
--- a/test/dbstatus.test
+++ b/test/dbstatus.test
@@ -14,6 +14,7 @@
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
+set testprefix dbstatus
 
 ifcapable !compound {
   finish_test
@@ -24,6 +25,7 @@ ifcapable !compound {
 db close
 sqlite3_shutdown
 sqlite3_config_memstatus 1
+sqlite3_config_uri 1
 sqlite3_initialize
 sqlite3 db test.db
 
@@ -377,4 +379,39 @@ foreach ::lookaside_buffer_size {0 64 120} {
   }
 }
 
+#-------------------------------------------------------------------------
+# The following tests focus on DBSTATUS_PROPORTIONAL_CACHE_USED
+#
+ifcapable shared_cache {
+  proc do_cacheused_test {tn db res} {
+    set cu [sqlite3_db_status $db SQLITE_DBSTATUS_CACHE_USED 0]
+    set pcu [sqlite3_db_status $db SQLITE_DBSTATUS_PROPORTIONAL_CACHE_USED 0]
+    set cu [lindex $cu 1]
+    set pcu [lindex $pcu 1]
+    uplevel [list do_test $tn [list list $cu $pcu] [list {*}$res]]
+  }
+  reset_db
+  sqlite3 db file:test.db?cache=shared
+
+  do_execsql_test 4.0 {
+    CREATE TABLE t1(a, b, c);
+    INSERT INTO t1 VALUES(1, 2, 3);
+  }
+  do_cacheused_test 4.0.1 db { 4568 4568 }
+  do_execsql_test 4.1 {
+    CREATE TEMP TABLE tt(a, b, c);
+    INSERT INTO tt VALUES(1, 2, 3);
+  }
+  do_cacheused_test 4.1.1 db { 9000 9000 }
+
+  sqlite3 db2 file:test.db?cache=shared
+  do_cacheused_test 4.2.1 db2 { 4568 2284 }
+  do_cacheused_test 4.2.2 db { 9000 6716 }
+  db close
+  do_cacheused_test 4.2.3 db2 { 4568 4568 }
+  sqlite3 db file:test.db?cache=shared
+  do_cacheused_test 4.2.4 db2 { 4568 2284 }
+  db2 close
+}
+
 finish_test