On Thu, 1 Mar 2007 16:09:15 -0800 Andrew Morton <[EMAIL PROTECTED]> wrote:
> On Thu, 1 Mar 2007 10:12:50 +0000 > [EMAIL PROTECTED] (Mel Gorman) wrote: > > > Any opinion on merging these patches into -mm > > for wider testing? > > I'm a little reluctant to make changes to -mm's core mm unless those > changes are reasonably certain to be on track for mainline, so let's talk > about that. > > What worries me is memory hot-unplug and per-container RSS limits. We > don't know how we're going to do either of these yet, and it could well be > that the anti-frag work significantly complexicates whatever we end up > doing there. > > For prioritisation purposes I'd judge that memory hot-unplug is of similar > value to the antifrag work (because memory hot-unplug permits DIMM > poweroff). About memory-hot-unplug, I'm now writing a new patch-set for memory-unplug for showing my overview and roadmap. I'm now debugging it. I think I will be able to post them as RFC in a week. At least, ZONE_MOVABLE(or something partitioning memory) is necessary for memory-hot-unplug like DIMM-poweroff. (I'm now using my own ZONE_MOVABLE patch, but It is O.K. to migrate to Mel's one if it's ready to be merged.) > Our basic unit of memory management is the zone. Right now, a zone maps > onto some hardware-imposed thing. But the zone-based MM works *well*. I > suspect that a good way to solve both per-container RSS and mem hotunplug > is to split the zone concept away from its hardware limitations: create a > "software zone" and a "hardware zone". All the existing page allocator and > reclaim code remains basically unchanged, and it operates on "software > zones". Each software zones always lies within a single hardware zone. > The software zones are resizeable. For per-container RSS we give each > container one (or perhaps multiple) resizeable software zones. > > For memory hotunplug, some of the hardware zone's software zones are marked > reclaimable and some are not; DIMMs which are wholly within reclaimable > zones can be depopulated and powered off or removed. > Hmm...software-zone seems attractive. I remember someone posted pesuedo-zone(pzone) patch in past. -Kame - 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/
