[Bionic][PATCH 0/1] KVM: PPC: Book3S HV: Fix handling of large pages in radix page fault handler
Joseph Salisbury
joseph.salisbury at canonical.com
Tue Mar 13 15:15:44 UTC 2018
BugLink: http://bugs.launchpad.net/bugs/1752236
== Bionic Justification ==
A patch has been posted to fix a Radix page fault handler bug in KVM:
http://patchwork.ozlabs.org/patch/877033/
" KVM: PPC: Book3S HV: Fix handling of large pages in radix page fault handler "
This is critical for P9 KVM performance. Using an open source database
workload, IBM saw an 11% throughput improvement with this patch when the
guest was backed w/ 2MB hugepages. Without this patch, hugepage backing
does not help performance compared to base page size.
This patch is in mainline as of v4.16-rc5.
== Fix ==
c3856aeb2940 ("KVM: PPC: Book3S HV: Fix handling of large pages in radix page fault handler")
== Regression Potential ==
Low. Limited to powerpc.
Paul Mackerras (1):
KVM: PPC: Book3S HV: Fix handling of large pages in radix page fault
handler
arch/powerpc/kvm/book3s_64_mmu_radix.c | 69 +++++++++++++++++++++-------------
1 file changed, 43 insertions(+), 26 deletions(-)
--
2.7.4
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