On Tue, 18 Sep 2007, Andi Kleen wrote:
> > The patch does require concurrent increments and decrements in the main
> > fault patch. The potential is to create another bouncing cacheline for
> > concurrent faults. This looks like it would cause a performance issue.
>
> While may be true correctn
> Handling policy ref counts for hugepages is a bit trickier.
> huge_zonelist() returns a zone list that might come from a
> shared or vma 'BIND policy. In this case, we should hold the
> reference until after the huge page allocation in
> dequeue_hugepage(). The patch modifies huge_zonelist()
> The patch does require concurrent increments and decrements in the main
> fault patch. The potential is to create another bouncing cacheline for
> concurrent faults. This looks like it would cause a performance issue.
While may be true correctness is always more important than performance.
So
On Mon, 17 Sep 2007, Lee Schermerhorn wrote:
> Only for vma policy, right? show_numa_maps() isn't a performance path,
> and shared policies are already reference counted--just not unref'd!
Right.
> I do have some ideas for enhancements to memtoy to test vma policies in
> a multi-threaded task.
On Mon, 2007-09-17 at 12:37 -0700, Christoph Lameter wrote:
> On Mon, 17 Sep 2007, Lee Schermerhorn wrote:
>
> > Here is the 23-rc6 verison of the patch. Andi considers it a high
> > priority bug fix for .23. I'm a bit uncomfortable with this, this late
> > in the 23 cycle. I've not heard of pr
On Mon, 17 Sep 2007, Lee Schermerhorn wrote:
> Here is the 23-rc6 verison of the patch. Andi considers it a high
> priority bug fix for .23. I'm a bit uncomfortable with this, this late
> in the 23 cycle. I've not heard of problems w/o this patch, but then,
> maybe no one notices if they leak a
Here is the 23-rc6 verison of the patch. Andi considers it a high
priority bug fix for .23. I'm a bit uncomfortable with this, this late
in the 23 cycle. I've not heard of problems w/o this patch, but then,
maybe no one notices if they leak a memory policy struct now and then,
or occasionally al
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