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Commit 33dd309f authored by Ricardo Cerqueira's avatar Ricardo Cerqueira
Browse files

frameworks/base: Disable fsync in selected databases. 

As an add-on to the WAL optimization, disable fsync in databases where
corruption and data consistency aren't a problem.

Change-Id: I41a85fa55ea71dc8dd3c4011102c28d2c1db8d3d
parent 03aca1be

core/jni/android_database_SQLiteDatabase.cpp

+15 −2
Original line number Diff line number Diff line
@@ -103,14 +103,23 @@ static int use_wal_mode (char const *path8) 
         "telephony.db","launcher.db","user_dict.db",\

         "downloads.db", "mmssms.db", "internal.db", \

         "EmailProvider.db","alarms.db","EmailProviderBody.db",\

         "btopp.db","picasa.db","webview.db",\

         "webviewCache.db","browser.db","quadrant.db", NULL};

         "btopp.db","picasa.db",\

         "webviewCache.db","browser.db", NULL};



    const char *wal_dbs_nosync[] = {

         "webview.db", "quadrant.db", \

         "MyDatabase.db", NULL};



    for (i = 0 ; wal_dbs[i]!= NULL ; i++) {

        if(strcmp(temp, wal_dbs[i]) == 0)

            return 1;

    }



    for (i = 0 ; wal_dbs_nosync[i]!= NULL ; i++) {

        if(strcmp(temp, wal_dbs_nosync[i]) == 0)

            return 2;

    }



    return 0;

}
@@ -171,6 +180,10 @@ static void dbopen(JNIEnv* env, jobject object, jstring pathString, jint flags) 
               LOGE("sqlite3_exec to set WAL autocheckpoint failed\n");

               throw_sqlite3_exception(env, handle);

               goto done;

            } else if (use_wal_mode(path8) == 2) {

                /* Try to disable fsyncs. We don't care if it fails */

                sqlite3_exec(handle,"PRAGMA synchronous = OFF;",

                           NULL, NULL,&zErrMsg);

            }

        }

    }