From 1952639665e92481c34c34c3e2a71bf3e66ba362 Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Mon, 4 Jun 2012 14:53:23 +0300 Subject: [PATCH] KVM: MMU: do not iterate over all VMs in mmu_shrink() mmu_shrink() needlessly iterates over all VMs even though it will not attempt to free mmu pages from more than one on them. Fix that and also check used mmu pages count outside of VM lock to skip inactive VMs faster. Signed-off-by: Gleb Natapov Signed-off-by: Avi Kivity --- arch/x86/kvm/mmu.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index d07e436b7a42..1ca7164a74f1 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -3944,7 +3944,6 @@ static void kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm, static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc) { struct kvm *kvm; - struct kvm *kvm_freed = NULL; int nr_to_scan = sc->nr_to_scan; if (nr_to_scan == 0) @@ -3956,22 +3955,30 @@ static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc) int idx; LIST_HEAD(invalid_list); + /* + * n_used_mmu_pages is accessed without holding kvm->mmu_lock + * here. We may skip a VM instance errorneosly, but we do not + * want to shrink a VM that only started to populate its MMU + * anyway. + */ + if (kvm->arch.n_used_mmu_pages > 0) { + if (!nr_to_scan--) + break; + continue; + } + idx = srcu_read_lock(&kvm->srcu); spin_lock(&kvm->mmu_lock); - if (!kvm_freed && nr_to_scan > 0 && - kvm->arch.n_used_mmu_pages > 0) { - kvm_mmu_remove_some_alloc_mmu_pages(kvm, - &invalid_list); - kvm_freed = kvm; - } - nr_to_scan--; + kvm_mmu_remove_some_alloc_mmu_pages(kvm, &invalid_list); kvm_mmu_commit_zap_page(kvm, &invalid_list); + spin_unlock(&kvm->mmu_lock); srcu_read_unlock(&kvm->srcu, idx); + + list_move_tail(&kvm->vm_list, &vm_list); + break; } - if (kvm_freed) - list_move_tail(&kvm_freed->vm_list, &vm_list); raw_spin_unlock(&kvm_lock);