diff -r 48780e181b38 -r 578be2adaf3e Symbian3/PDK/Source/GUID-95840076-79F2-524B-BAF7-828260BDD923.dita --- a/Symbian3/PDK/Source/GUID-95840076-79F2-524B-BAF7-828260BDD923.dita Tue Jul 20 12:00:49 2010 +0100 +++ b/Symbian3/PDK/Source/GUID-95840076-79F2-524B-BAF7-828260BDD923.dita Fri Aug 13 16:47:46 2010 +0100 @@ -1,42 +1,42 @@ - - - - - -Patchable -Constants: KHeapShrinkHysRatio -EXPORT_C extern const TInt KHeapShrinkHysRatio; - - - - -

Exported from:

-

EUSER.DLL, EKERN.EXE

- - -

Defined in:

-

.../os/kernelhwsrv/kernel/eka/common/heap.cpp

- - -

Purpose:

-

This constant defines the ratio that determines the amount of hysteresis -between heap growing and heap shrinking. It is a 32-bit fixed point number -where the radix point is defined to be between bits 7 and 8 (where the LSB -is bit 0) i.e. using standard notation, a Q8 or a fx24.8 fixed point number. -For example for a ratio of 2.0 set KHeapShrinkHysRatio=0x200.

The -heap shrinking hysteresis value is calculated to be:

KHeapShrinkHysRatio*(iGrowBy>>8)

where iGrowBy is a page aligned value set by the argument, aGrowBy, -to the RHeap constructor. Default hysteresis value is iGrowBy bytes -i.e. KHeapShrinkHysRatio=2.0. Memory usage may be improved -by reducing the heap shrinking hysteresis by setting 1.0 < KHeapShrinkHysRatio < -2.0. Heap shrinking hysteresis is disabled/removed when KHeapShrinkHysRatio <= -1.0.

- - - + + + + + +Patchable +Constants: KHeapShrinkHysRatio +EXPORT_C extern const TInt KHeapShrinkHysRatio; +
+ + + +

Exported from:

+

EUSER.DLL, EKERN.EXE

+ + +

Defined in:

+

.../os/kernelhwsrv/kernel/eka/common/heap.cpp

+ + +

Purpose:

+

This constant defines the ratio that determines the amount of hysteresis +between heap growing and heap shrinking. It is a 32-bit fixed point number +where the radix point is defined to be between bits 7 and 8 (where the LSB +is bit 0) i.e. using standard notation, a Q8 or a fx24.8 fixed point number. +For example for a ratio of 2.0 set KHeapShrinkHysRatio=0x200.

The +heap shrinking hysteresis value is calculated to be:

KHeapShrinkHysRatio*(iGrowBy>>8)

where iGrowBy is a page aligned value set by the argument, aGrowBy, +to the RHeap constructor. Default hysteresis value is iGrowBy bytes +i.e. KHeapShrinkHysRatio=2.0. Memory usage may be improved +by reducing the heap shrinking hysteresis by setting 1.0 < KHeapShrinkHysRatio < +2.0. Heap shrinking hysteresis is disabled/removed when KHeapShrinkHysRatio <= +1.0.

+ + +
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