On Wed, 2007-10-31 at 14:52 +1100, Nick Piggin wrote: > On Wednesday 31 October 2007 03:04, Peter Zijlstra wrote: > > Change ALLOC_NO_WATERMARK page allocation such that the reserves are system > > wide - which they are per setup_per_zone_pages_min(), when we scrape the > > barrel, do it properly. > > > > IIRC it's actually not too uncommon to have allocations coming here via > page reclaim. It's not exactly clear that you want to break mempolicies > at this point.
Hmm, the way I see it is that mempolicies are mainly for user-space allocations, reserve allocations are always kernel allocations. These already break mempolicies - for example hardirq context allocations. Also, as it stands, the reserve is spread out evenly over all zones/nodes (excluding highmem), so by restricting ourselves to a subset, we don't have access to the full reserve.
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