On Tue, 20 May 2014, Rusty Russell wrote:

Hugh Dickins [off-list ref] writes:

quoted

quoted

On Monday 19 May 2014 05:42 AM, Rusty Russell wrote:

quoted

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