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KVM: MMU: improve write flooding detected

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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: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong
2011-09-22 16:58:36 +08:00
committed by Avi Kivity
parent 5d9ca30e96
commit a30f47cb15
3 changed files with 32 additions and 48 deletions
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6
arch/x86/include/asm/kvm_host.h
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@@ -239,6 +239,8 @@ struct kvm_mmu_page {
int clear_spte_count;
#endif
int write_flooding_count;
struct rcu_head rcu;
};
@@ -353,10 +355,6 @@ struct kvm_vcpu_arch {
struct kvm_mmu_memory_cache mmu_page_cache;
struct kvm_mmu_memory_cache mmu_page_header_cache;
gfn_t last_pt_write_gfn;
int last_pt_write_count;
u64 *last_pte_updated;
struct fpu guest_fpu;
u64 xcr0;