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

[Timur Tabi]

Roland Dreier wrote:
>     Troy> How is memory pinning handled? (I haven't had time to read
>     Troy> all the code, so please excuse my ignorance of something
>     Troy> obvious).
> 
> The userspace library calls mlock() and then the kernel does
> get_user_pages().

Why do you call mlock() and get_user_pages()?  In our code, we only call mlock(), and the 
memory is pinned.  We have a test case that fails if only get_user_pages() is called, but 
it passes if only mlock() is called.

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