From 12e04b45afea459a3dca841a7504ede5d1df8200 Mon Sep 17 00:00:00 2001
From: Erik Zandvliet <erik.zandvliet@ddvtech.com>
Date: Thu, 10 Mar 2016 14:22:30 +0100
Subject: [PATCH] Made the default page size a compile flag

---
 CMakeLists.txt | 3 +++
 lib/defines.h  | 7 ++++++-
 src/io.cpp     | 6 +++---
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 478f1bfb..9a214c5d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,6 +79,9 @@ endif()
 if (DEFINED BIGMETA )
   add_definitions(-DBIGMETA=1)
 endif()
+if (DEFINED DATASIZE )
+  add_definitions(-DSHM_DATASIZE=${DATASIZE})
+endif()
 if (NOT DEFINED NOUPDATE )
   add_definitions(-DUPDATER=1)
 endif()
diff --git a/lib/defines.h b/lib/defines.h
index 6322dccc..0c561630 100644
--- a/lib/defines.h
+++ b/lib/defines.h
@@ -57,11 +57,16 @@ static const char * DBG_LVL_LIST[] = {"NONE", "FAIL", "ERROR", "WARN", "INFO", "
 
 #endif
 
+
+#ifndef SHM_DATASIZE
+#define SHM_DATASIZE 25
+#endif
+
 /// The size used for stream header pages under Windows, where they cannot be size-detected.
 #define DEFAULT_META_PAGE_SIZE 16 * 1024 * 1024
 
 /// The size used for stream data pages under Windows, where they cannot be size-detected.
-#define DEFAULT_DATA_PAGE_SIZE 25 * 1024 * 1024
+#define DEFAULT_DATA_PAGE_SIZE SHM_DATASIZE * 1024 * 1024
 
 /// The size used for server configuration pages.
 #define DEFAULT_CONF_PAGE_SIZE 4 * 1024 * 1024
diff --git a/src/io.cpp b/src/io.cpp
index 078f5120..19c1cc24 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -490,17 +490,17 @@ namespace Mist {
       //If there is no page, create it
       if (!pagesByTrack.count(tid) || pagesByTrack[tid].size() == 0) {
         nextPageNum = 1;
-        pagesByTrack[tid][1].dataSize = (25 * 1024 * 1024);//Initialize op 25mb
+        pagesByTrack[tid][1].dataSize = DEFAULT_DATA_PAGE_SIZE;//Initialize op 25mb
         pagesByTrack[tid][1].pageNum = 1;
       }
       //Take the last allocated page
       std::map<unsigned long, DTSCPageData>::reverse_iterator tmpIt = pagesByTrack[tid].rbegin();
       //Compare on 8 mb boundary
-      if (tmpIt->second.curOffset > (8 * 1024 * 1024)) { 
+      if (tmpIt->second.curOffset > FLIP_DATA_PAGE_SIZE) { 
         //Create the book keeping data for the new page
         nextPageNum = tmpIt->second.pageNum + tmpIt->second.keyNum;
         INFO_MSG("We should go to next page now, transition from %lu to %d", tmpIt->second.pageNum, nextPageNum);
-        pagesByTrack[tid][nextPageNum].dataSize = (25 * 1024 * 1024);
+        pagesByTrack[tid][nextPageNum].dataSize = DEFAULT_DATA_PAGE_SIZE;
         pagesByTrack[tid][nextPageNum].pageNum = nextPageNum;
       }
       pagesByTrack[tid].rbegin()->second.lastKeyTime = packet.getTime();