lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

KVM: switch to get_user_pages_fast

Browse Source 
Convert gfn_to_pfn to use get_user_pages_fast, which can do lockless
pagetable lookups on x86. Kernel compilation on 4-way guest is 3.7%
faster on VMX.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti
2008-09-16 20:54:47 -03:00
committed by Avi Kivity
parent 777b3f49d2
commit 4c2155ce81
6 changed files with 15 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/kvm/44x_tlb.c
View File

@@ -147,9 +147,7 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid,
stlbe = &vcpu->arch.shadow_tlb[victim];
/* Get reference to new page. */
down_read(&current->mm->mmap_sem);
new_page = gfn_to_page(vcpu->kvm, gfn);
up_read(&current->mm->mmap_sem);
if (is_error_page(new_page)) {
printk(KERN_ERR "Couldn't get guest page for gfn %lx!\n", gfn);
kvm_release_page_clean(new_page);