Messages in this thread Patch in this message | | | From | Xiao Guangrong <> | Subject | [PATCH v5 8/8] KVM: MMU: zap pages in batch | Date | Thu, 16 May 2013 20:17:53 +0800 |
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Zap at lease 10 pages before releasing mmu-lock to reduce the overload caused by requiring lock
[ It improves kernel building 0.6% ~ 1% ]
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> --- arch/x86/kvm/mmu.c | 11 ++++++++--- 1 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index e12f431..9c27fda 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4216,10 +4216,12 @@ restart: spin_unlock(&kvm->mmu_lock); } +#define BATCH_ZAP_PAGES 10 static void zap_invalid_pages(struct kvm *kvm) { struct kvm_mmu_page *sp, *node; LIST_HEAD(invalid_list); + int batch = 0; restart: list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) { @@ -4256,11 +4258,14 @@ restart: * Need not flush tlb since we only zap the sp with invalid * generation number. */ - if (cond_resched_lock(&kvm->mmu_lock)) + if ((batch >= BATCH_ZAP_PAGES) && + cond_resched_lock(&kvm->mmu_lock)) { + batch = 0; goto restart; + } - if (kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list)) - goto restart; + batch += kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); + goto restart; } /* -- 1.7.7.6
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