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Subject[RFC][PATCH 3/5] x86: Allow specifying node_distance() for numa=fake
Allows emulating more interesting NUMA configurations like a quad
socket AMD Magny-Cour:

"numa=fake=8:10,16,16,22,16,22,16,22,
16,10,22,16,22,16,22,16,
16,22,10,16,16,22,16,22,
22,16,16,10,22,16,22,16,
16,22,16,22,10,16,16,22,
22,16,22,16,16,10,22,16,
16,22,16,22,16,22,10,16,
22,16,22,16,22,16,16,10"

Which has a non-fully-connected topology.

Cc: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: x86@kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
arch/x86/mm/numa_emulation.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
Index: linux-2.6/arch/x86/mm/numa_emulation.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/numa_emulation.c
+++ linux-2.6/arch/x86/mm/numa_emulation.c
@@ -339,9 +339,11 @@ void __init numa_emulation(struct numa_m
} else {
unsigned long n;

- n = simple_strtoul(emu_cmdline, NULL, 0);
+ n = simple_strtoul(emu_cmdline, &emu_cmdline, 0);
ret = split_nodes_interleave(&ei, &pi, 0, max_addr, n);
}
+ if (*emu_cmdline == ':')
+ emu_cmdline++;

if (ret < 0)
goto no_emu;
@@ -418,7 +420,9 @@ void __init numa_emulation(struct numa_m
int physj = emu_nid_to_phys[j];
int dist;

- if (physi >= numa_dist_cnt || physj >= numa_dist_cnt)
+ if (get_option(&emu_cmdline, &dist) == 2)
+ ;
+ else if (physi >= numa_dist_cnt || physj >= numa_dist_cnt)
dist = physi == physj ?
LOCAL_DISTANCE : REMOTE_DISTANCE;
else



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