On Fri, 7 Feb 2014, Joonsoo Kim wrote:

quoted

This check wouild need to be something that checks for other contigencies
in the page allocator as well. A simple solution would be to actually run
a GFP_THIS_NODE alloc to see if you can grab a page from the proper node.
If that fails then fallback. See how fallback_alloc() does it in slab.

Hello, Christoph.

This !node_present_pages() ensure that allocation on this node cannot succeed.
So we can directly use numa_mem_id() here.

Yes of course we can use numa_mem_id().

But the check is only for not having any memory at all on a node. There
are other reason for allocations to fail on a certain node. The node could
have memory that cannot be reclaimed, all dirty, beyond certain
thresholds, not in the current set of allowed nodes etc etc.

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