On 09/23/2010 05:05 AM, Xiao Guangrong wrote:
> > How can you drop an active unsync page? > > I'm missing something here. > Umm, this feature is used like this: hold mmu_lock increase sp->active_count release mmu_lock ...... hold mmu_lock increase sp->active_count if (!sp->active_count&& sp->invalid) kvm_mmu_free_page(sp); ...... release mmu_lock
Well, the implementation is confusing. Maybe we should have mmu_ref_sp() and mmu_drop_sp() wrappers to manage the reference counts and call mmu_free_page() automatically.
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