On Mon, May 14, 2012 at 03:44:06PM +0300, Avi Kivity wrote: > Using RCU for lockless shadow walking can increase the amount of memory > in use by the system, since RCU grace periods are unpredictable. We also > have an unconditional write to a shared variable (reader_counter), which > isn't good for scaling. > > Replace that with a scheme similar to x86's get_user_pages_fast(): disable > interrupts during lockless shadow walk to force the freer > (kvm_mmu_commit_zap_page()) to wait for the TLB flush IPI to find the > processor with interrupts enabled. > > We also add a new vcpu->mode, READING_SHADOW_PAGE_TABLES, to prevent > kvm_flush_remote_tlbs() from avoiding the IPI. > > Signed-off-by: Avi Kivity <[email protected]>
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