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Date: Sat, 17 Apr 2010 17:20:34 +0800 From: Lai Jiangshan <laijs@...fujitsu.com> To: Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>, LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org Subject: [PATCH 1/2] kvm: simplify kvm_vm_ioctl_set_memory_alias It's just time waste if we free a object and allocate it immediately. Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com> --- diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 24cd0ee..db8d7fe 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2479,15 +2479,8 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm, rcu_assign_pointer(kvm->arch.aliases, aliases); synchronize_srcu_expedited(&kvm->srcu); kvm_mmu_zap_all(kvm); - kfree(old_aliases); - - r = -ENOMEM; - aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL); - if (!aliases) - goto out_unlock; - - memcpy(aliases, kvm->arch.aliases, sizeof(struct kvm_mem_aliases)); + aliases = old_aliases; p = &aliases->aliases[alias->slot]; p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT; p->npages = alias->memory_size >> PAGE_SHIFT; @@ -2505,7 +2498,6 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm, kfree(old_aliases); r = 0; -out_unlock: mutex_unlock(&kvm->slots_lock); out: return r; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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