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| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-02-25 12:47:38 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-08 14:33:33 +0300 |
| commit | 50c9e6f3a69dfa458ecb671bcbd11e2eea6db0c1 (patch) | |
| tree | 7f5822d1a0a1399cabb440c130307907e7c19eaa /arch/x86/kvm/mmu.c | |
| parent | 2a74003ae818cfaf129ed4df89499a1c2b796129 (diff) | |
| download | linux-50c9e6f3a69dfa458ecb671bcbd11e2eea6db0c1.tar.xz | |
KVM: MMU: coalesce more page zapping in mmu_sync_children
mmu_sync_children can only process up to 16 pages at a time. Check
if we need to reschedule, and do not bother zapping the pages until
that happens.
Reviewed-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index fecc9c51d924..754d2c4f6f99 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2059,24 +2059,31 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu, struct mmu_page_path parents; struct kvm_mmu_pages pages; LIST_HEAD(invalid_list); + bool flush = false; while (mmu_unsync_walk(parent, &pages)) { bool protected = false; - bool flush = false; for_each_sp(pages, sp, parents, i) protected |= rmap_write_protect(vcpu, sp->gfn); - if (protected) + if (protected) { kvm_flush_remote_tlbs(vcpu->kvm); + flush = false; + } for_each_sp(pages, sp, parents, i) { flush |= kvm_sync_page(vcpu, sp, &invalid_list); mmu_pages_clear_parents(&parents); } - kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush); - cond_resched_lock(&vcpu->kvm->mmu_lock); + if (need_resched() || spin_needbreak(&vcpu->kvm->mmu_lock)) { + kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush); + cond_resched_lock(&vcpu->kvm->mmu_lock); + flush = false; + } } + + kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush); } static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp) |