On 05/26/2010 11:49 AM, Lai Jiangshan wrote:
I think users will enable tdp when their hardwares support ept or npt. This patch can reduce about 50% kvm mmu memory usage for they. This simple patch use the fact that: When sp->role.direct is set, sp->gfns does not contain any essential information, leaf sptes reachable from this sp are for a continuate guest physical memory range(a linear range). So sp->gfns[i](if it was set) equals to sp->gfn + i. (PT_PAGE_TABLE_LEVEL) Obviously, it is not essential information, we can calculate it when need. It means we don't need sp->gfns when sp->role.direct=1, Thus we can save one page usage for every kvm_mmu_page. Note: Access to sp->gfns must be wrapped by kvm_mmu_page_get_gfn() or kvm_mmu_page_set_gfn(). It is only exposed in FNAME(sync_page).
Applied, thanks. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
