Re: [RFC PATCH 0/4]: affinity-on-next-touch

[Brice Goglin]

Andi Kleen wrote:
> Stefan Lankes <lankes@xxxxxxxxxxxxxxxxxxx> writes:
>   
>> [Patch 1/4]: Extend the system call madvise with a new parameter
>> MADV_ACCESS_LWP (the same as used in Solaris). The specified memory area
>>     
>
> Linux does NUMA memory policies in mbind(), not madvise()
> Also if there's a new NUMA policy it should be in the standard
> Linux NUMA memory policy frame work, not inventing a new one
>   

Marking a buffer as "migrate-on-next-touch" is very different from
setting a NUMA policy. Migrate-on-next-touch a temporary flag that is
cleared on the next-touch. It's cleared per page, not per area or
whatever. So marking a VMA as "migrate-on-next-touch" doesn't make much
sense since some pages could already have been migrated (and brought
back to their usual state) while some other are still marked as
migrate-on-next-touch.

Brice

--
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/