On Fri, 26 Jan 2007 07:44:42 -0800 (PST) Christoph Lameter <[EMAIL PROTECTED]> wrote:
> On Fri, 26 Jan 2007, Andrew Morton wrote: > > > > > > Track mlocked pages via a ZVC > > > > Why? > > Large amounts of mlocked pages may be a problem for > > 1. Reclaim behavior. > > 2. Defragmentation > We know that. What has that to do with this patch? > > > You could perhaps go for a walk across all the other vmas which presently > > map this page. If any of them have VM_LOCKED, don't increment the counter. > > Similar on removal: only decrement the counter when the final mlocked VMA > > is dropping the pte. > > For that we would need an additional refcount for vmlocked maps in the > page struct. No you don't. The refcount is already there. It is "the sum of the VM_LOCKED VMAs which map this page". It might be impractical or expensive to calculate it, but it's there. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
