• Xiao Guangrong's avatar
    KVM: MMU: improve write flooding detected · a30f47cb
    Xiao Guangrong authored
    Detecting write-flooding does not work well, when we handle page written, if
    the last speculative spte is not accessed, we treat the page is
    write-flooding, however, we can speculative spte on many path, such as pte
    prefetch, page synced, that means the last speculative spte may be not point
    to the written page and the written page can be accessed via other sptes, so
    depends on the Accessed bit of the last speculative spte is not enough
    
    Instead of detected page accessed, we can detect whether the spte is accessed
    after it is written, if the spte is not accessed but it is written frequently,
    we treat is not a page table or it not used for a long time
    Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
    Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
    a30f47cb
mmu.c 99.1 KB