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authorDavid Rientjes <rientjes@google.com>2007-07-21 17:10:32 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-21 18:37:10 -0700
commit3484d79813707bb6045773953a809abba443dc20 (patch)
treea986c674698face8fc51132a1feeac53fa7946a2 /include/linux/acpi.h
parent3af044e0f832cfa3fcdce14dc30678b79dd36995 (diff)
x86_64: fake pxm-to-node mapping for fake numa
For NUMA emulation, our SLIT should represent the true NUMA topology of the system but our proximity domain to node ID mapping needs to reflect the emulated state. When NUMA emulation has successfully setup fake nodes on the system, a new function, acpi_fake_nodes() is called. This function determines the proximity domain (_PXM) for each true node found on the system. It then finds which emulated nodes have been allocated on this true node as determined by its starting address. The node ID to PXM mapping is changed so that each fake node ID points to the PXM of the true node that it is located on. If the machine failed to register a SLIT, then we assume there is no special requirement for emulated node affinity so we use the default LOCAL_DISTANCE, which is newly exported to this code, as our measurement if the emulated nodes appear in the same PXM. Otherwise, we use REMOTE_DISTANCE. PXM_INVAL and NID_INVAL are also exported to the ACPI header file so that we can compare node_to_pxm() results in generic code (in this case, the SRAT code). Cc: Len Brown <lenb@kernel.org> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/acpi.h')
-rw-r--r--include/linux/acpi.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index e88b62e6b3a..d5680cd7746 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -231,6 +231,9 @@ extern int acpi_paddr_to_node(u64 start_addr, u64 size);
extern int pnpacpi_disabled;
+#define PXM_INVAL (-1)
+#define NID_INVAL (-1)
+
#else /* CONFIG_ACPI */
static inline int acpi_boot_init(void)