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SubjectRe: [PATCHv3 0/2] mm: map few pages around fault address if they are in page cache
On Thu, Feb 27, 2014 at 01:28:22PM -0800, Linus Torvalds wrote:
> (a) could you test this on a couple of different architectures?


Here's data from 4-socket Westmere. The advantage of faultaround is not that
obvious here.

FAULT_AROUND_ORDER baseline 2 4 6

Linux build (make -j40)
minor-faults 297,626,681 245,934,795 227,800,211 221,052,532
time, seconds 293.4322 291.4602 292.9198 295.2355

Linux rebuild (make -j40)
minor-faults 5,903,936 3,802,148 3,018,728 2,735,602
time, seconds 41.5657 41.0301 40.7621 41.1161

Git test suite
minor-faults 171,314,056 109,187,718 81,955,503 70,172,157
time, seconds 223.2327 220.2623 223.8355 231.7843

I don't have time to test on Haswell now. Probably later.

--
Kirill A. Shutemov


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