(2013/05/22 15:57), Atsushi Kumagai wrote: > On Wed, 15 May 2013 13:43:59 -0500 > Cliff Wickman <cpw at sgi.com> wrote: > >> From: Cliff Wickman <cpw at sgi.com> >> >> 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 <cpw at sgi.com> > > 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
