From 96852f836d69456a71beaa5263885bb88e2354aa Mon Sep 17 00:00:00 2001 From: Takuya Yoshikawa Date: Wed, 6 Mar 2013 16:06:58 +0900 Subject: [PATCH] --- yaml --- r: 372983 b: refs/heads/master c: 5da596078f915a62e39a20e582308eab91b88c9a h: refs/heads/master i: 372981: edcc44bf4c70dd1ba447666a69693e434e2f0f0b 372979: b4e613128c245898bd532ca1223a983bfc142211 372975: c46be8021c01a2fd11516f670d953e1b16ba1134 v: v3 --- [refs] | 2 +- trunk/arch/x86/kvm/mmu.c | 55 +++++++++++++++++----------------------- 2 files changed, 24 insertions(+), 33 deletions(-) diff --git a/[refs] b/[refs] index cd066541d500..1163c53b381f 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: 945315b9dbbe102bb3393a34ea4a10fb2a5ff303 +refs/heads/master: 5da596078f915a62e39a20e582308eab91b88c9a diff --git a/trunk/arch/x86/kvm/mmu.c b/trunk/arch/x86/kvm/mmu.c index 0f42645a063c..fdacabba6f62 100644 --- a/trunk/arch/x86/kvm/mmu.c +++ b/trunk/arch/x86/kvm/mmu.c @@ -2110,6 +2110,21 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm, } } +static bool prepare_zap_oldest_mmu_page(struct kvm *kvm, + struct list_head *invalid_list) +{ + struct kvm_mmu_page *sp; + + if (list_empty(&kvm->arch.active_mmu_pages)) + return false; + + sp = list_entry(kvm->arch.active_mmu_pages.prev, + struct kvm_mmu_page, link); + kvm_mmu_prepare_zap_page(kvm, sp, invalid_list); + + return true; +} + /* * Changing the number of mmu pages allocated to the vm * Note: if goal_nr_mmu_pages is too small, you will get dead lock @@ -2117,23 +2132,15 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm, void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int goal_nr_mmu_pages) { LIST_HEAD(invalid_list); - /* - * If we set the number of mmu pages to be smaller be than the - * number of actived pages , we must to free some mmu pages before we - * change the value - */ spin_lock(&kvm->mmu_lock); if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) { - while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages && - !list_empty(&kvm->arch.active_mmu_pages)) { - struct kvm_mmu_page *page; + /* Need to free some mmu pages to achieve the goal. */ + while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) + if (!prepare_zap_oldest_mmu_page(kvm, &invalid_list)) + break; - page = container_of(kvm->arch.active_mmu_pages.prev, - struct kvm_mmu_page, link); - kvm_mmu_prepare_zap_page(kvm, page, &invalid_list); - } kvm_mmu_commit_zap_page(kvm, &invalid_list); goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages; } @@ -4007,13 +4014,10 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) { LIST_HEAD(invalid_list); - while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES && - !list_empty(&vcpu->kvm->arch.active_mmu_pages)) { - struct kvm_mmu_page *sp; + while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES) { + if (!prepare_zap_oldest_mmu_page(vcpu->kvm, &invalid_list)) + break; - sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev, - struct kvm_mmu_page, link); - kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); ++vcpu->kvm->stat.mmu_recycled; } kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); @@ -4182,19 +4186,6 @@ void kvm_mmu_zap_all(struct kvm *kvm) spin_unlock(&kvm->mmu_lock); } -static void kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm, - struct list_head *invalid_list) -{ - struct kvm_mmu_page *page; - - if (list_empty(&kvm->arch.active_mmu_pages)) - return; - - page = container_of(kvm->arch.active_mmu_pages.prev, - struct kvm_mmu_page, link); - kvm_mmu_prepare_zap_page(kvm, page, invalid_list); -} - static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc) { struct kvm *kvm; @@ -4229,7 +4220,7 @@ static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc) idx = srcu_read_lock(&kvm->srcu); spin_lock(&kvm->mmu_lock); - kvm_mmu_remove_some_alloc_mmu_pages(kvm, &invalid_list); + prepare_zap_oldest_mmu_page(kvm, &invalid_list); kvm_mmu_commit_zap_page(kvm, &invalid_list); spin_unlock(&kvm->mmu_lock);