inconsistent do_gettimeofday for copy_page

[Ashwin Rao]

For calculating the time required to copy_page i tried
the do_gettimeofday for 1000 pages in a loop. But as
the number of pages changes the time required varies
non-linearly.
I also tried reading xtime and using monotonic_clock
but they didnt help either. For do_gettimeof day for a
single invocation of copy_page on a pentium 4 gave me
10 microsecs but when invoked for a 1000 pages the
time required was 750ns per page.
Is there some way of finding out the exact time
required for copying a page.

Ashwin

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