* Ingo Molnar <mi...@kernel.org> wrote:
> > Michel indicated that he does not use PROT_NONE for his
> > working set estimation code, but instead checks the accessed
> > bits in the page tables.
>
> The pte_young() WSS method has a couple of fundamental
> limitations:
>
> - it doesn't work with shared memory very well, the pte is per
> mapping, not per page. The PROT_NONE method instruments the
> physical page in essence.
>
> - it does not tell us which task touched the pte, in a
> multi-threaded program
>
> So like Peter I'd too expect these new WSS methods to eventually
> be picked up for any serious WSS work.
Nevertheless lets wait and see until it actually happens - and
meanwhile the prot_none namings are confusing.
So I've applied your patch as-is, with two more (new) usage
sites converted as well. Will push it out after a bit of
testing.
Thanks,
Ingo
--
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/
