SYSTEM_REGISTRY_QUOTA_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTEXAPI_H

typedef struct _SYSTEM_REGISTRY_QUOTA_INFORMATION
{
    ULONG RegistryQuotaAllowed;
    ULONG RegistryQuotaUsed;
    SIZE_T PagedPoolSize;
} SYSTEM_REGISTRY_QUOTA_INFORMATION, *PSYSTEM_REGISTRY_QUOTA_INFORMATION;

#endif

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NTinternals.net (undocumented.ntinternals.net)

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

Requirements

Privilege: SE_INCREASE_QUOTA_PRIVILEGE

See also

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