Messages in this thread | | | Date | Wed, 7 Apr 2010 11:00:14 +0200 | From | Andi Kleen <> | Subject | Re: Memory policy question for NUMA arch.... |
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On Tue, Apr 06, 2010 at 01:46:44PM -0700, Rick Sherm wrote: > On a NUMA host, if a driver calls __get_free_pages() then > it will eventually invoke ->alloc_pages_current(..). The comment > above/within alloc_pages_current() says 'current->mempolicy' will be > used.So what memory policy will kick-in if the driver is trying to > allocate some memory blocks during driver load time(say from probe_one)? System-wide default policy,correct?
Actually the policy of the modprobe or the kernel boot up if built in (which is interleaving)
> > What if the driver wishes to i) stay confined to a 'cpulist' OR ii) use a different mem-policy? How > do I achieve this? > I will choose the 'cpulist' after I am successfuly able to affinitize the MSI-X vectors.
You can do that right now by running numactl ... modprobe ...
Yes there should be probably a better way, like using a policy based on the affinity of the PCI device.
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
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