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x86-64, NUMA: Better explain numa_distance handling

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Handling of out-of-bounds distances and allocation failure can use
better documentation.  Add it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
This commit is contained in:
Tejun Heo 2011-03-02 11:32:47 +01:00
parent ce0033307f
commit eb8c1e2c83
2 changed files with 15 additions and 2 deletions
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6
arch/x86/mm/numa_emulation.c
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@ -379,7 +379,11 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt)
if (emu_nid_to_phys[i] == NUMA_NO_NODE)
emu_nid_to_phys[i] = 0;
/* transform distance table */
/*
* Transform distance table. numa_set_distance() ignores all
* out-of-bound distances. Just call it for every possible node
* combination.
*/
numa_reset_distance();
for (i = 0; i < MAX_NUMNODES; i++) {
for (j = 0; j < MAX_NUMNODES; j++) {