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    SubjectRe: [PATCH 6/8] Add __GFP_OTHER_NODE flag
    On 2/22/2011 1:42 PM, David Rientjes wrote:
    > This makes the accounting worse, NUMA_LOCAL is defined as "allocation from
    > local node," meaning it's local to the allocating cpu, not local to the
    > node being targeted.

    Local to the process really (and I defined it originally ...) That is
    what I'm implementing

    I don't think "local to some random kernel daemon which changes mappings
    on behalf of others"
    makes any sense as semantics.

    > Further, preferred_zone has taken on a much more significant meaning other
    > than just statistics: it impacts the behavior of memory compaction and how
    > long congestion timeouts are, if a timeout is taken at all, depending on
    > the I/O being done on behalf of the zone.
    > A better way to address the issue is by making sure preferred_zone is
    > actually correct by using the appropriate zonelist to be passed into the
    > allocator in the first place

    That is what is done already (well for THP together with my other patches)
    The problem is just that local_hit/miss still uses numa_node_id() and
    not the preferred zone
    to do the accounting. In most cases that's fine and intended, just not
    for these
    special daemons.


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      Last update: 2011-02-22 22:49    [W:0.019 / U:13.800 seconds]
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