Undocumented functions of NTDLL

2OOO, 24 December

typedef struct _SYSTEM_REGISTRY_QUOTA_INFORMATION {




  ULONG                   RegistryQuotaAllowed;
  ULONG                   RegistryQuotaUsed;
  ULONG                   PagedPoolSize;



} SYSTEM_REGISTRY_QUOTA_INFORMATION, *PSYSTEM_REGISTRY_QUOTA_INFORMATION;

RegistryQuotaAllowed

Allowed size of all currently loaded hives.

RegistryQuotaUsed

Size of all currently loaded hives.

PagedPoolSize

Paged Pool size. RegistryQuotaAllowed shouldn't be grater then 80 percent of PagedPoolSize.

Remember that registry size is always sum of all loaded hives. So if you call NtSaveKey, size of registry will have the highest point at the end of saving.
SYSTEM_REGISTRY_QUOTA_INFORMATION don't need restart of system to change registry quota. 

Documented by:

Tomasz Nowak

Sven B. Schreiber

Library: ntdll.lib

Privileges: SE_INCREASE_QUOTA_PRIVILEGE

NtQuerySystemInformation

NtRestoreKey

NtSaveKey

NtSetSystemInformation

SYSTEM_INFORMATION_CLASS