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Date: Wed, 7 Feb 2007 19:37:49 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: Andi Kleen <ak@...e.de> Cc: linux-kernel@...r.kernel.org, y-goto@...fujitsu.com, clameter@...r.sgi.com, akpm@...l.org Subject: Re: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node On Wed, 7 Feb 2007 11:19:02 +0100 Andi Kleen <ak@...e.de> wrote: > > > AFAIK, ia64 creates nodes just depends on SRAT's possible resource information. > > Then, ia64 can create cpu-memory-less-node(node with no available resource.). > > (*)I don't like this. > > > > If we don't allow memory-less-node, we may have to add several codes for cpu-hot-add. > > cpus should be moved to nearby node at hotadd . > > And node-hot-add have to care that cpus mustn't be added before memory, cpu-driven > > node-hot-add will never occur. (ACPI's 'container' device spec can't guaranntee this.) > > You can also alias node numbers to solve this: just point multiple node numbers > to the same pgdat. For a memory less node this would be a nearby one. > Hmm, interesting...the 'alias' means follwing ? == NODE_DATA(A) = pgdat_for_A NODE_DATA(B) = pgdat_for_A // B is memory-less. - NODE_DATA(B) is valid but B is not online. == looks complicated..and we have to care /sys/devices/system/node handling. -Kame - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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