Hi,

quoted

quoted

I want to copy a page from one physical location

to

quoted

another (taking the appr. locks).

At the risk of sounding stupid, what problem are you
trying to solve by copying
a page? Not only (as you note) could the page be
referenced by multiple
processes, it could (conceivably) belong to a kernel
slab or something, or be a
buffer for an in-flight I/O request, or any number
of other possibly-racy
situations.

The problem is the memory fragmentation. The code i am
writing is for the memory defragmentation as proposed
by Daniel Phillips, my project partner Alok mooley has
given mailed a simple prototype in the mid of feb.

If you only care about anonymous memory, how do you think
about expanding the COW mechanism?

  1. make all pages COW in a process space.
  2. force to cause COW fault on the each page.
  3. copy from the page to a new allocated page, and discard the old page.

You may preallocate new pages.


Thank you,
Hirokazu Takahashi.
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