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KVM: Remove test-before-set optimization for dirty bits
authorTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Fri, 23 Apr 2010 08:48:35 +0000 (17:48 +0900)
committerAvi Kivity <avi@redhat.com>
Mon, 17 May 2010 09:19:13 +0000 (12:19 +0300)
commitd14769377a247d4e7b570592a090474c8a059938
treefd7e0de9712a29f99962b789ab3ab70a1338087ftree | snapshot (tar.gz zip)
parent039091875ce4629d83db64c055528e7b86337d50commit | diff
KVM: Remove test-before-set optimization for dirty bits

As Avi pointed out, testing bit part in mark_page_dirty() was important
in the days of shadow paging, but currently EPT and NPT has already become
common and the chance of faulting a page more that once per iteration is
small. So let's remove the test bit to avoid extra access.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
virt/kvm/kvm_main.c diff | blob | blame | history
kernel source for telekom puls (alcatel/mediatek)