191 const TInt KControlIoGlobalCacheConfig=KMaxTInt-24;

   192 const TInt KControlIoGlobalCacheInfo=KMaxTInt-25;

   193 const TInt KControlIoDirCacheConfig=KMaxTInt-26;

   194 const TInt KControlIoDirCacheInfo=KMaxTInt-27;

   195 const TInt KControlIoSimulateMemoryLow=KMaxTInt-28;

   196 const TInt KControlIoStopSimulateMemoryLow=KMaxTInt-29;

   265 class TGlobalCacheConfig

   266     {

   267 public:

   268     TInt32 iGlobalCacheSizeInBytes;      		// in bytes 

   269     TInt32 iGlobalLowMemoryThreshold;         	// in percentage

   270     };

   271 

   272 class TGlobalCacheInfo

   273     {

   274 public:

   275     TInt32 iGlobalCacheSizeInBytes;     		// in bytes 

   276     TInt32 iGlobalLowMemoryThreshold;   		// in percentage

   277     };

   278 

   279 class TDirCacheConfig

   280     {

   281 public:

   282     TInt iDrive;

   283 

   284     TInt32 iLeafDirCacheSize;           // in number of most recently visited leaf directories

   285     TInt32 iDirCacheSizeMin;            // in bytes

   286     TInt32 iDirCacheSizeMax;            // in bytes

   287     };

   288 

   289 class TDirCacheInfo

   290     {

   291 public:

   292     TInt iDrive;

   293 

   294     /**

   295     Segment size in bytes. A memory segment is the smallest memory unit that Kernel manages through RChunk.

   296     */

   297     TInt32 iMemorySegmentSize;

   298 

   299     /**

   300     Size of memory a page occupies, in bytes.

   301     Note: following restrictions may result a difference between page size in memory & page size in data:

   302         1. page size can not be smaller than segment size

   303         2. one page can not contain data from two different clusters

   304     */

   305     TInt32 iPageSizeInMemory;

   306 

   307     /**

   308     Size of actual data a page contains, in bytes.

   309     Note: following restrictions may result a difference between page size in memory & page size in data:

   310         1. page size can not be smaller than segment size

   311         2. one page can not contain data from two different clusters

   312     */

   313     TInt32 iPageSizeInData;

   314     

   315     /**

   316     The minimum number of pages that the cache can contain, even under low memory conditions.

   317     */

   318     TInt32 iMinCacheSizeInPages;

   319 

   320     /**

   321     The maximum number of pages that the cache can contain, when there is enough free memory in the system.

   322     */

   323     TInt32 iMaxCacheSizeInPages;

   324     

   325     /**

   326     The minimum cache size in memory. In bytes.

   327     */

   328     TInt32 iMinCacheSizeInMemory;

   329 

   330     /**

   331     The maximum cache size in memroy. In bytes.

   332     */

   333     TInt32 iMaxCacheSizeInMemory;

   334     

   335     /**

   336     Current count of the locked pages.

   337     */

   338     TInt32 iLockedPageNumber;

   339 

   340     /**

   341     Current count of the unlocked pages.

   342     */

   343     TInt32 iUnlockedPageNumber;

   344     

   345     };

   346