Hi,

here is a patch we use to integrate the Quadrics NICs into the Linux kernel.
The patch adds hooks to the Linux VM subsystem so that registered 'IOPROC'
devices can be informed of page table changes.
This allows the Quadrics NICs to perform user RDMAs safely, without requiring
page pinning. Looking through some of the recent IB and Ammasso discussions,
it may also prove useful to those NICs too.

This patch has been deployed in many large (1000+ CPUs) production Linux
clusters at high profile HPC sites such as LLNL and PNL. It has also been
incorporated in Linux kernel releases from HP, SGI and Bull.

I have discussed this patch with Andrew Morton and Andrea Arcangeli and they
believe now is the time to encourage further comments on whether it's
suitable to be incorporated into the mainline kernel.

Cheers,

David Addison
Quadrics Ltd