Re: MPOL_INTERLEAVE page-wise binding dump

[Ananya Muddukrishna <ananya@kth.se>]

> > Is there an inexpensive way to determine 
> > which pages (virtual addresses) 
> > are bound to which NUMA nodes when 
> > using MPOL_INTERLEAVE or MPOL_BIND 
> > with a given set of nodes?   
> 
> 
> get_mempolicy MPOL_F_ADDR|MPOL_F_NODE
>   

Thanks! I will check this out and get back. I hope this returns the
affinity as a page-to-node map.

> > 
> > I want to implement a strict 
> > round-robin based interleaving 
> > policy based on MPOL_INTERLEAVE.   
> 
> What's the rationale?  

The rationale relates to scheduling tasks (OpenMP and the like) with
page affinity in a user-level runtime system (work-crew threading
model).

The runtime system allocates memory pages in a deterministic way using
mbind and from then on, schedules tasks such that accesses to task
operated pages (affinity) do not incur large NUMA overheads. I am
thinking of using mlock so that swapin_readahead does not affect the
affinity of runtime-allocated pages. The first-touch policy is not of
much help since the allocated memory is initialized before tasks are
scheduled. 

-- Ananya