Re: question on page-migration code

[Ray Bryant <raybry@engr.sgi.com>]

Marcello,

Checking /proc/vmstat/pgpgout appears to indicate that the pages I am
migrating are being swapped out when I see the migration slow down,
although something is fishy with pgpgout.  pgpgout is supposed to be
KB of page I/O, but I know that I am migrating 8685 pages, at 16KB/page,
or 138960 KB.  pgpgout gets incremented by roughly twice this.
So it looks like either:

(1)  pgpgout is really sectors written, or
(2)  pages are being paged out twice as part of memory migration.

I still don't understand why this pageout process doesn't happen
every time I do a migration (e. g. never on the first time),
and why it is taking 210 s to page out 138960 K.  That's around 600 KB/s
of I/O to the paging disk.
-- 
Best Regards,
Ray
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                   Ray Bryant
512-453-9679 (work)         512-507-7807 (cell)
raybry@sgi.com             raybry@austin.rr.com
The box said: "Requires Windows 98 or better",
            so I installed Linux.
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