On Wed, Aug 21, 2013 at 04:42:53PM -0700, Andi Kleen wrote: > Cyrill Gorcunov <gorcu...@gmail.com> writes: > > > > Hi all, I worked on patch which would not touch PSE bit for dirty page > > tracking and the result is not that good: > > > > - 2level pages now always page dirty if page is swapped in and out, because > > there is no space left in PTE (other than PSE bit) > > Maybe just don't support soft dirty for 2 level page tables? > > 2 level page tables should be really on the way out anyways, as they > have severe limits and do not support NX. With 3 levels there is enough > space.
Look, good thing is that 7th bit also available on the 4level pages (ie x86-64) without additional code modification, that's why I picked it in first place. I prepared the patch locally which doesn't use pse bit for tracking but it only makes code more complex. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
