Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7cfa4b0a43286b1da3afa4f5f99d52e65a8f30fc
Commit: 7cfa4b0a43286b1da3afa4f5f99d52e65a8f30fc
Parent: 5e58cfe41c7e5902c32bb7f62993d43fb4c48ccf
Author: Avi Kivity <[EMAIL PROTECTED]>
AuthorDate: Mon Jul 23 18:33:14 2007 +0300
Committer: Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Wed Jul 25 14:30:56 2007 +0300
Revert "KVM: Avoid useless memory write when possible"
This reverts commit a3c870bdce4d34332ebdba7eb9969592c4c6b243. While it
does save useless updates, it (probably) defeats the fork detector, causing
a massive performance loss.
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
drivers/kvm/kvm_main.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 46efbe7..a8d8db8 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1070,10 +1070,8 @@ static int emulator_write_phys(struct kvm_vcpu *vcpu,
gpa_t gpa,
return 0;
mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
virt = kmap_atomic(page, KM_USER0);
- if (memcmp(virt + offset_in_page(gpa), val, bytes)) {
- kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
- memcpy(virt + offset_in_page(gpa), val, bytes);
- }
+ kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
+ memcpy(virt + offset_in_page(gpa), val, bytes);
kunmap_atomic(virt, KM_USER0);
return 1;
}
-
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