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

[Libor Michalek]

On Wed, May 04, 2005 at 01:27:54PM -0500, Timur Tabi wrote:
> Libor Michalek wrote:
> 
> >   The program opens the charcter device file descriptor, pins the pages
> > and waits for a signal, before checking the pages, which is sent to the
> > process after running some other program which exercises the VM. On older
> > kernels the check fails, on my 2.6.11 kernel the check succeeds. So
> > mlock is not needed on top of get_user_pages() as it was before.
> 
> When you say "older", what exactly do you mean? I have different test 
> that normally fails with just get_user_pages(), but it works with 2.6.9
> and above.  I haven't been able to get any kernel earlier than 2.6.9 to
> compile or boot properly, so I'm having a hard time narrowing down the
> actual point when get_user_pages() started working.

  The older kernel I tried was one of the 2.4.21 RHEL 3 kernels. I hadn't
spent much time investigating the issue since this was a new kernel, so it
was a natural one for me to try.

-Libor