third_party/sqlite/patches/0003-Use-seperate-page-cache-pools-for-each-sqlite-connec.patch

   1 From 3a6d9302ff14aec82291c7e2212ce37b7453ce9f Mon Sep 17 00:00:00 2001
   2 From: rmcilroy <rmcilroy@chromium.org>
   3 Date: Thu, 20 Jun 2013 22:50:12 +0000
   4 Subject: [PATCH 03/16] Use seperate page-cache pools for each sqlite
   5  connection.
   6
   7 Due to multiple different subsystems using sqlite, the shared global page
   8 cache policy does not suite our use-cases on Chrome very well.  This CL
   9 enables a compile time flag to be set to disable shared cache pools.
  10
  11 BUG=243769
  12
  13 Original review URL: https://chromiumcodereview.appspot.com/17413004
  14 ---
  15  third_party/sqlite/src/src/pcache1.c | 6 +++++-
  16  1 file changed, 5 insertions(+), 1 deletion(-)
  17
  18 diff --git a/third_party/sqlite/src/src/pcache1.c b/third_party/sqlite/src/src/pcache1.c
  19 index a8c3217..3fcee4b 100644
  20 --- a/third_party/sqlite/src/src/pcache1.c
  21 +++ b/third_party/sqlite/src/src/pcache1.c
  22 @@ -567,6 +567,8 @@ static sqlite3_pcache *pcache1Create(int szPage, int szExtra, int bPurgeable){
  23    ** PGroup.  In other words, separateCache is true for mode (1) where no
  24    ** mutexing is required.
  25    **
  26 +  **   *  Always use separate caches (mode-1) if SQLITE_SEPARATE_CACHE_POOLS
  27 +  **
  28    **   *  Always use a unified cache (mode-2) if ENABLE_MEMORY_MANAGEMENT
  29    **
  30    **   *  Always use a unified cache in single-threaded applications
  31 @@ -574,7 +576,9 @@ static sqlite3_pcache *pcache1Create(int szPage, int szExtra, int bPurgeable){
  32    **   *  Otherwise (if multi-threaded and ENABLE_MEMORY_MANAGEMENT is off)
  33    **      use separate caches (mode-1)
  34    */
  35 -#if defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) || SQLITE_THREADSAFE==0
  36 +#ifdef SQLITE_SEPARATE_CACHE_POOLS
  37 +  const int separateCache = 1;
  38 +#elif defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) || SQLITE_THREADSAFE==0
  39    const int separateCache = 0;
  40  #else
  41    int separateCache = sqlite3GlobalConfig.bCoreMutex>0;
  42 --
  43 2.2.1
  44