Re: [PATCH UPDATE] x86: ignore spurious faults

[Jeremy Fitzhardinge]

Ingo Molnar wrote:
> thanks, applied.
>
> it would be nice to expose this ability of the architecture to the core 
> Linux kernel mprotect code as well, and let it skip on a TLB flush when 
> doing a RO->RW transition.

The usermode fault handler already effectively does this; this patch 
just does it for kernel mode as well.  I don't know if mprotect takes 
advantage of this.

>  It could speed up valgrind and the other 
> mprotect() users i guess? [and UML too perhaps]
>   

Not valgrind (it doesn't rely on mmap protections), but electric fence 
perhaps.

   J

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/