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KVM: PPC: Enable use of secondary htab bucket

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We had code to make use of the secondary htab buckets, but kept that
disabled because it was unstable when I put it in.

I checked again if that's still the case and apparently it was only
exposing some instability that was there anyways before. I haven't
seen any badness related to usage of secondary htab entries so far.

This should speed up guest memory allocations by quite a bit, because
we now have more space to put PTEs in.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2010-02-19 11:00:46 +01:00 • committed by Avi Kivity
parent c10207fe86
commit 20a340abd3
1 changed files with 1 additions and 8 deletions
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9
arch/powerpc/kvm/book3s_64_mmu_host.c
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@ -257,16 +257,9 @@ int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
if (ret < 0) {
/* If we couldn't map a primary PTE, try a secondary */
#ifdef USE_SECONDARY
hash = ~hash;
vflags ^= HPTE_V_SECONDARY;
attempt++;
if (attempt % 2)
vflags = HPTE_V_SECONDARY;
else
vflags = 0;
#else
attempt = 2;
#endif
goto map_again;
} else {
int hpte_id = kvmppc_mmu_hpte_cache_next(vcpu);