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KVM: MMU: Introduce a helper function for FIFO zapping
Make the code for zapping the oldest mmu page, placed at the tail of the active list, a separate function. Reviewed-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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@ -2110,6 +2110,21 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
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}
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}
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static bool prepare_zap_oldest_mmu_page(struct kvm *kvm,
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struct list_head *invalid_list)
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{
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struct kvm_mmu_page *sp;
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if (list_empty(&kvm->arch.active_mmu_pages))
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return false;
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sp = list_entry(kvm->arch.active_mmu_pages.prev,
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struct kvm_mmu_page, link);
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kvm_mmu_prepare_zap_page(kvm, sp, invalid_list);
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return true;
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}
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/*
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* Changing the number of mmu pages allocated to the vm
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* Note: if goal_nr_mmu_pages is too small, you will get dead lock
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@ -2117,23 +2132,15 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
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void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int goal_nr_mmu_pages)
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{
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LIST_HEAD(invalid_list);
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/*
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* If we set the number of mmu pages to be smaller be than the
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* number of actived pages , we must to free some mmu pages before we
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* change the value
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*/
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spin_lock(&kvm->mmu_lock);
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if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) {
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while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages &&
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!list_empty(&kvm->arch.active_mmu_pages)) {
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struct kvm_mmu_page *page;
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/* Need to free some mmu pages to achieve the goal. */
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while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages)
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if (!prepare_zap_oldest_mmu_page(kvm, &invalid_list))
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break;
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page = container_of(kvm->arch.active_mmu_pages.prev,
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struct kvm_mmu_page, link);
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kvm_mmu_prepare_zap_page(kvm, page, &invalid_list);
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}
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kvm_mmu_commit_zap_page(kvm, &invalid_list);
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goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages;
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}
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@ -4007,13 +4014,10 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
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{
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LIST_HEAD(invalid_list);
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while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES &&
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!list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
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struct kvm_mmu_page *sp;
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while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES) {
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if (!prepare_zap_oldest_mmu_page(vcpu->kvm, &invalid_list))
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break;
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sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev,
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struct kvm_mmu_page, link);
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kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list);
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++vcpu->kvm->stat.mmu_recycled;
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}
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kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
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@ -4182,19 +4186,6 @@ restart:
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spin_unlock(&kvm->mmu_lock);
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}
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static void kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm,
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struct list_head *invalid_list)
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{
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struct kvm_mmu_page *page;
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if (list_empty(&kvm->arch.active_mmu_pages))
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return;
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page = container_of(kvm->arch.active_mmu_pages.prev,
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struct kvm_mmu_page, link);
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kvm_mmu_prepare_zap_page(kvm, page, invalid_list);
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}
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static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc)
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{
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struct kvm *kvm;
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@ -4229,7 +4220,7 @@ static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc)
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idx = srcu_read_lock(&kvm->srcu);
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spin_lock(&kvm->mmu_lock);
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kvm_mmu_remove_some_alloc_mmu_pages(kvm, &invalid_list);
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prepare_zap_oldest_mmu_page(kvm, &invalid_list);
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kvm_mmu_commit_zap_page(kvm, &invalid_list);
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spin_unlock(&kvm->mmu_lock);
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