Book3s suffered from my really bad shadow MMU implementation so far. So
I finally got around to implement a combined hash and list mechanism that
allows for much faster lookup of mapped pages.
To show that it really is faster, I tried to run simple process spawning
code inside the guest with and without these patches:
[without]
debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello > /dev/null; done
real 0m20.235s
user 0m10.418s
sys 0m9.766s
[with]
debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello > /dev/null; done
real 0m14.659s
user 0m8.967s
sys 0m5.688s
So as you can see, performance improved significantly.
v2 -> v3:
- use hlist
- use global slab cache
Alexander Graf (2):
KVM: PPC: Add generic hpte management functions
KVM: PPC: Make use of hash based Shadow MMU
arch/powerpc/include/asm/kvm_book3s.h | 9 +
arch/powerpc/include/asm/kvm_host.h | 17 ++-
arch/powerpc/kvm/Makefile | 2 +
arch/powerpc/kvm/book3s.c | 14 ++-
arch/powerpc/kvm/book3s_32_mmu_host.c | 104 ++-----------
arch/powerpc/kvm/book3s_64_mmu_host.c | 98 +-----------
arch/powerpc/kvm/book3s_mmu_hpte.c | 277 +++++++++++++++++++++++++++++++++
7 files changed, 331 insertions(+), 190 deletions(-)
create mode 100644 arch/powerpc/kvm/book3s_mmu_hpte.c
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