Re: Memory policy question for NUMA arch....
Andi Kleen <[email protected]>
| Newsgroups | org.kernel.vger.linux-numa,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
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 -- [email protected] -- Speaking for myself only.