MmTrimAllSystemPageableMemory

NTFSD
1

Hi,
whats this function (MmTrimAllSystemPageableMemory()) about? It is
called from CcCopyWrite()->CcUnpinRepinedBcb() and causes me
Pagefault on accessing data 0xFF3DD800 which are actually paged out.
(synchronous, NonPagingIO write extending filesize of compressed file
in DllCache initiated from Winlogon/SFC). My filter is encryption FS
filter loaded on boot.

Thanks in advance Ondra Sevecek.

Nov? vyhled?va? pro ?esk? internet www.WebFast.cz - prost? najde …

2

My guess is that it is related to Driver Verifier’s support for paging out all pageable memory in order to find drivers that inappropriately use paged code/data.

-----Original Message-----
From: “Ondrej?evecek” [mailto:xxxxx@centrum.cz]
Sent: Thursday, November 28, 2002 3:32 PM
To: File Systems Developers
Subject: [ntfsd] MmTrimAllSystemPageableMemory

Hi,
whats this function (MmTrimAllSystemPageableMemory()) about? It is
called from CcCopyWrite()->CcUnpinRepinedBcb() and causes me
Pagefault on accessing data 0xFF3DD800 which are actually paged out.
(synchronous, NonPagingIO write extending filesize of compressed file
in DllCache initiated from Winlogon/SFC). My filter is encryption FS
filter loaded on boot.

Thanks in advance Ondra Sevecek.

Nov? vyhled?va? pro ?esk? internet www.WebFast.cz - prost? najde …

You are currently subscribed to ntfsd as: xxxxx@inin.com
To unsubscribe send a blank email to %%email.unsub%%

3

Do you have verifier enabled? Verifier calls it when IRQL checking is turned on, and IRQL is raised to >= DISPATCH_LEVEL (such as when a spinlock is acquired) to trim all pageable data/code out. Just so that you can catch any bugs in your driver - and you may have one here -where you access pageable data/code when, for instance a spinlock is acquired.
By the way - incurring a page fault in CcCopyWrite is normal (the user’s buffer can be paged out for instance).
Did you bugcheck? What was the stack?
Ravi

-----Original Message-----
From: “Ondrej?evecek” [mailto:xxxxx@centrum.cz]
Sent: Thursday, November 28, 2002 12:32 PM
To: File Systems Developers
Subject: [ntfsd] MmTrimAllSystemPageableMemory

Hi,
whats this function (MmTrimAllSystemPageableMemory()) about? It is
called from CcCopyWrite()->CcUnpinRepinedBcb() and causes me
Pagefault on accessing data 0xFF3DD800 which are actually paged out. (synchronous, NonPagingIO write extending filesize of compressed file
in DllCache initiated from Winlogon/SFC). My filter is encryption FS
filter loaded on boot.

Thanks in advance Ondra Sevecek.

Nov? vyhled?va? pro ?esk? internet www.WebFast.cz - prost? najde …

You are currently subscribed to ntfsd as: xxxxx@windows.microsoft.com To unsubscribe send a blank email to %%email.unsub%%