Messages in this thread | | | Date | Mon, 19 May 2014 19:34:27 -0700 (PDT) | From | Hugh Dickins <> | Subject | Re: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc |
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On Tue, 20 May 2014, Rusty Russell wrote: > Hugh Dickins <hughd@google.com> writes: > >> On Monday 19 May 2014 05:42 AM, Rusty Russell wrote: > >> > > >> > Perhaps we try to generalize from two data points (a slight improvement > >> > over doing it from 1!), eg: > >> > > >> > /* 4 seems good for 4k-page x86, 0 seems good for 64k page ppc64, so: */ > >> > unsigned int fault_around_order __read_mostly = > >> > (16 - PAGE_SHIFT < 0 ? 0 : 16 - PAGE_SHIFT); > > > > Rusty's bimodal answer doesn't seem the right starting point to me. > > ? It's not bimodal, it's graded. I think you misread?
Yikes, worse than misread, more like I was too rude even to read: sorry!
Hugh
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