On Tue, Oct 14, 2014 at 03:57:36PM -0700, Andy Lutomirski wrote: > Context switches and TLB flushes can change individual bits of CR4. > CR4 reads take several cycles, so store a shadow copy of CR4 in a > per-cpu variable. > > To avoid wasting a cache line, I added the CR4 shadow to > cpu_tlbstate, which is already touched during context switches.
I'm a little confused. We should be more specific I suppose, context switches don't always change mm, but CR4 state is per task. >From a quick look, only switch_mm() pokes at tlb, switch_to() does not. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
