linux-kernel - Re: [rfc] balance-on-fork NUMA placement

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Message-ID: <Pine.LNX.4.64.0708021748110.13312@schroedinger.engr.sgi.com>
Date:	Thu, 2 Aug 2007 17:52:28 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <npiggin@...e.de>
cc:	Andi Kleen <ak@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [rfc] balance-on-fork NUMA placement

On Fri, 3 Aug 2007, Nick Piggin wrote:

> > Add a (slow) kmalloc_policy? Strict Object round robin for interleave 
> > right? It probably needs its own RR counter otherwise it disturbs the per 
> > task page RR.
> 
> I guess interleave could be nice for other things, but for this, I
> just want MPOL_BIND to work. The problem is that the pagetable copying
> etc codepaths cover a lot of code and some of it (eg pagetable allocation)
> is used for other paths as well.. so I was just hoping to do something
> less intrusive for now if possible.

Ok. So MPOL_BIND on a single node. We would have to save the current 
memory policy on the stack and then restore it later. Then you would need 
a special call anyways.

Or is there some way to execute the code on the target cpu? That may be 
the easiest solution.
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