Re: 3rd version of R/W mmap_sem patch available

[Jeff Garzik <jgarzik@mandrakesoft.com>]

Andrew Morton wrote:
> General comment: an expensive part of a pagefault
> is zeroing the new page.  It'd be nice if we could
> drop the page_table_lock while doing the clear_user_page()
> and, if possible, copy_user_page() functions.  Very nice.

People have talked before about creating zero pages in the background,
or creating them as a side effect of another operation (don't recall
details), so yeah this is definitely an area where some optimizations
could be done.  I wouldn't want to do it until 2.5 though...

-- 
Jeff Garzik       | May you have warm words on a cold evening,
Building 1024     | a full mooon on a dark night,
MandrakeSoft      | and a smooth road all the way to your door.
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