From: Gui Jianfeng Date: Tue, 27 Apr 2010 02:39:49 +0000 (+0800) Subject: KVM: Fix mmu shrinker error X-Git-Tag: v2.6.35-rc1~436^2~31 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d35b8dd9355805f17225fdbfee4bc704d7bf7547;p=karo-tx-linux.git KVM: Fix mmu shrinker error kvm_mmu_remove_one_alloc_mmu_page() assumes kvm_mmu_zap_page() only reclaims only one sp, but that's not the case. This will cause mmu shrinker returns a wrong number. This patch fix the counting error. Signed-off-by: Gui Jianfeng Signed-off-by: Marcelo Tosatti --- diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 9696d654b01f..18d2f584945b 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2902,13 +2902,13 @@ restart: kvm_flush_remote_tlbs(kvm); } -static void kvm_mmu_remove_one_alloc_mmu_page(struct kvm *kvm) +static int kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm) { struct kvm_mmu_page *page; page = container_of(kvm->arch.active_mmu_pages.prev, struct kvm_mmu_page, link); - kvm_mmu_zap_page(kvm, page); + return kvm_mmu_zap_page(kvm, page) + 1; } static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask) @@ -2920,7 +2920,7 @@ static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask) spin_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) { - int npages, idx; + int npages, idx, freed_pages; idx = srcu_read_lock(&kvm->srcu); spin_lock(&kvm->mmu_lock); @@ -2928,8 +2928,8 @@ static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask) kvm->arch.n_free_mmu_pages; cache_count += npages; if (!kvm_freed && nr_to_scan > 0 && npages > 0) { - kvm_mmu_remove_one_alloc_mmu_page(kvm); - cache_count--; + freed_pages = kvm_mmu_remove_some_alloc_mmu_pages(kvm); + cache_count -= freed_pages; kvm_freed = kvm; } nr_to_scan--;