From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: [PATCH v3 8/11] KVM: MMU: introduce pte_prefetch_topup_memory_cache() Date: Wed, 30 Jun 2010 16:07:24 +0800 Message-ID: <4C2AFB3C.6000601@cn.fujitsu.com> References: <4C2AF9FA.9020601@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , LKML , KVM list To: Avi Kivity Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:61509 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753091Ab0F3ILL (ORCPT ); Wed, 30 Jun 2010 04:11:11 -0400 In-Reply-To: <4C2AF9FA.9020601@cn.fujitsu.com> Sender: kvm-owner@vger.kernel.org List-ID: Introduce this function to topup prefetch cache Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 25 +++++++++++++++++++++---- 1 files changed, 21 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index a0c5c31..6673484 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -89,6 +89,8 @@ module_param(oos_shadow, bool, 0644); } #endif +#define PTE_PREFETCH_NUM 16 + #define PT_FIRST_AVAIL_BITS_SHIFT 9 #define PT64_SECOND_AVAIL_BITS_SHIFT 52 @@ -290,15 +292,16 @@ static void __set_spte(u64 *sptep, u64 spte) #endif } -static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, - struct kmem_cache *base_cache, int min) +static int __mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, + struct kmem_cache *base_cache, int min, + int max, gfp_t flags) { void *obj; if (cache->nobjs >= min) return 0; - while (cache->nobjs < ARRAY_SIZE(cache->objects)) { - obj = kmem_cache_zalloc(base_cache, GFP_KERNEL); + while (cache->nobjs < max) { + obj = kmem_cache_zalloc(base_cache, flags); if (!obj) return -ENOMEM; cache->objects[cache->nobjs++] = obj; @@ -306,6 +309,20 @@ static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, return 0; } +static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, + struct kmem_cache *base_cache, int min) +{ + return __mmu_topup_memory_cache(cache, base_cache, min, + ARRAY_SIZE(cache->objects), GFP_KERNEL); +} + +static int pte_prefetch_topup_memory_cache(struct kvm_vcpu *vcpu) +{ + return __mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache, + rmap_desc_cache, PTE_PREFETCH_NUM, + PTE_PREFETCH_NUM, GFP_ATOMIC); +} + static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc, struct kmem_cache *cache) { -- 1.6.1.2