[openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation

[Timur Tabi]

Roland Dreier wrote:
>     Timur> Why do you call mlock() and get_user_pages()?  In our code,
>     Timur> we only call mlock(), and the memory is pinned.  We have a
>     Timur> test case that fails if only get_user_pages() is called,
>     Timur> but it passes if only mlock() is called.
> 
> What if a buggy/malicious userspace program doesn't call mlock()?

Our library calls mlock() when the apps requests memory to be "registered".  We then call 
munlock() when the app requests the memory to be unregistered.  All apps talk to our 
library for all services.  No apps talk to the driver directly.

-- 
Timur Tabi
Staff Software Engineer
timur.tabi at ammasso.com