Re: [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbsimplementation
From: Timur Tabi
Date: Tue Apr 26 2005 - 15:24:26 EST
Roland Dreier wrote:
Yes, I agree. If an app wants to register half a page and pass the
other half to a child process, I think the only answer is "don't do
How can the app know that, though? It would have to allocate I/O buffers with knowledge
of page boundaries. Today, the apps just malloc() a bunch of memory and pay no attention
to whether the beginning or the end of the buffer shares a page with some other, unrelated
object. We may as well tell the app that it needs to page-align all I/O buffers.
My point is that we can't just simply say, "Don't do that". Some entity (the kernel,
libraries, whatever) should be able to tell the app that its usage of memory is going to
break in some unpredictable way.
Staff Software Engineer
One thing a Southern boy will never say is,
"I don't think duct tape will fix it."
-- Ed Smylie, NASA engineer for Apollo 13
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