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x86/numa: Allow specifying node_distance() for numa=fake

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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.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/n/tip-e1136ef7kdffj7yf9tjhydln@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2012-04-18 19:04:17 +02:00 committed by Ingo Molnar
parent 19209bbb86
commit 94c0dd3278
1 changed files with 6 additions and 2 deletions
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8
arch/x86/mm/numa_emulation.c
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@ -339,9 +339,11 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt)
} 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_meminfo *numa_meminfo, int numa_dist_cnt)
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