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[Bug 1357014] Re: Add THP fixes in 14.10 kernel


Thanks Tim. We would like to have this fix also available on 14.04
(before 14.04.02). Do you think it is feasible? If so, we can work on
the backport of the patches.

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  Add THP fixes in 14.10 kernel

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux” source package in Utopic:
  Fix Committed

Bug description:
  Hi Canonical,

  We would like to include 8 patches regarding Transparent Huge Page for
  powerpc. The patches are already upstream on Ben powerpc-next tree and
  should be sent to Linus' tree today, which mean that they are expected
  to make 3.17.

  Here are the patches

  9e813308a5c18c58f9ccae1ec72ed4e14eaf9025 powerpc/thp: Add tracepoints to track hugepage invalidate
  85c1fafd7262e68ad821ee1808686b1392b1167d powerpc/mm: Use read barrier when creating real_pte
  7e467245bf5226db34c4b12d3cbacfa2f7a15a8b powerpc/thp: Use ACCESS_ONCE when loading pmdp
  969b7b208f7408712a3526856e4ae60ad13f6928 powerpc/thp: Invalidate with vpn in loop
  fc0479557572375100ef16c71170b29a98e0d69a powerpc/thp: Handle combo pages in invalidate
  629149fae478f0ac6bf705a535708b192e9c6b59 powerpc/thp: Invalidate old 64K based hash page mapping before insert of 4k pte
  fa1f8ae80f8bb996594167ff4750a0b0a5a5bb5d powerpc/thp: Don't recompute vsid and ssize in loop on invalidate
  b0aa44a3dfae3d8f45bd1264349aa87f87b7774f powerpc/thp: Add write barrier after updating the valid bit

  I am also adding the patches here for reference.

  Thank you,

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