lkml.org 
[lkml]   [2005]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
At Mon, 25 Apr 2005 16:58:03 -0700,
Roland Dreier wrote:
> Andrew> It would be better to obtain this memory via a mmap() of
> Andrew> some special device node, so we can perform appropriate
> Andrew> permission checking and clean everything up on unclean
> Andrew> application exit.
>
> This seems to interact poorly with how applications want to use RDMA,
> ie typically through a library interface such as MPI. People doing
> HPC don't want to recode their apps to use a new allocator, they just
> want to link to a new MPI library and have the app go fast.

Such HPC users cannot use the memory hotremoval feature, and something
needs to be implemented so that the NUMA migration can handle such
memory properly, but I see your point.

If such memory were allocated by a driver, the memory could be placed
in non-hotremovable areas to avoid the above problems.

--
IWAMOTO Toshihiro
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-04-26 04:06    [W:0.113 / U:0.424 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site