On Wed, 20 Mar 2002, Alfred Perlstein wrote:
> >
> > Currently it means, if I can't get KVA or a page to back it, return NULL.
> > It just stops operations that would REALLY block. The old code reserved
> > the KVA up front and just found a page at interrupt time.
>
> Bottom line, will the semantics change?
>
> What it sounds like is that if things aren't "just right" (which may
> be the majority of times) we may fail earlier than the old code would,
> is this true?
>
> Basically, what changes semantically because of your change?
>
The short answer is, no we won't fail any earlier. The reason the KVA was
reserved before was so that you wouldn't have to grab a lock at interrupt
time to do allocations. Now we can grab locks, we just can't msleep.
This makes things a lot simpler.
Jeff
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