Re: sys_mlock/sys_munlock

[Petr Vandrovec]

On  6 Oct 00 at 17:45, Atul Mukker. wrote:
> Hi,
> Can i use sys_mlock and sys_munlock in my driver module to lock/unlock the
> user address pages.
> 
> Thanks
> 
> P.S.    Please mark your mail CC to [e-mail]

VMware's vmmon and in-kernel raw devices (and kiobufs) use simple
incrementing/decrementing page count - first cause pagein (vmmon uses
get_user(), kiobufs something more sophisticated), then use get_page
on that page. To release, use put_page().

But do not forget to look at my today's report about page->mapping == NULL...
If you'll do it with shared-mapped pages, and someone truncates file
they are mapped from, bad things can happen under 2.4.0 :-(
                                        Best regards,
                                            Petr Vandrovec
                                            [e-mail]