Description

Specifies the priority of a pool memory allocation request.

Constants

LowPoolPriority

This setting indicates that it is acceptable to the driver for the mapping request to fail if the system is low on resources. For example, this could be for a non-critical network connection where the driver can handle the failure case when system resources are close to being depleted.

LowPoolPrioritySpecialPoolOverrun

LowPoolPrioritySpecialPoolUnderrun

NormalPoolPriority

Indicates that it is acceptable to the driver for the mapping request to fail if the system is very low on resources. For example, this could be for a non-critical local filesystem request.

NormalPoolPrioritySpecialPoolOverrun

NormalPoolPrioritySpecialPoolUnderrun

HighPoolPriority

Should be used when it is unacceptable to the driver for the mapping request to fail unless the system is out of resources. An example of this would be the paging file path in a driver.

HighPoolPrioritySpecialPoolOverrun

HighPoolPrioritySpecialPoolUnderrun

Syntax

typedef _Enum_is_bitflag_ enum _EX_POOL_PRIORITY {
    LowPoolPriority,
    LowPoolPrioritySpecialPoolOverrun = 8,
    LowPoolPrioritySpecialPoolUnderrun = 9,
    NormalPoolPriority = 16,
    NormalPoolPrioritySpecialPoolOverrun = 24,
    NormalPoolPrioritySpecialPoolUnderrun = 25,
    HighPoolPriority = 32,
    HighPoolPrioritySpecialPoolOverrun = 40,
    HighPoolPrioritySpecialPoolUnderrun = 41
} EX_POOL_PRIORITY;

Remarks

The SpecialPool settings can be used to bound the allocation at a page beginning or end.Use this option only on systems being debugged as the memory cost is expensive.

See also

ExAllocatePoolPriorityZero