(2013/05/22 15:57), Atsushi Kumagai wrote:
On Wed, 15 May 2013 13:43:59 -0500
Cliff Wickman <[email protected]> wrote:
From: Cliff Wickman <[email protected]>
Because addresses of each successive page structure are often descending
it is much faster to use read()'s, so set off info->flag_usemmap
while doing exclude_free_page().
Signed-off-by: Cliff Wickman <[email protected]>
Sounds good.
BTW, do you have a speed measurement like your another patch ?
Also how about keeping mmap mode and reducing mapping size temporarily
to 4KiB?
I find this to speed the scan of page structures for a 1TB system from
60sec to 30sec.
I don't know which this measured time indicates. Only free pages
filtering or free pages filtering plus unnecessary pages filtering?
--
Thanks.
HATAYAMA, Daisuke
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