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| author | Linus Torvalds <torvalds@osdl.org> | 2006-02-17 20:38:21 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-17 13:27:06 -0800 |
| commit | 4cf808eb443ead42777a0230b73aec0cee7fb298 (patch) | |
| tree | 2d6dac429fcfcf18c9837c8c34164eff03e46fec | |
| parent | cfe91f9ce297e23e6fbdf61c02bdd8ab9af7c8a8 (diff) | |
| download | op-kernel-dev-4cf808eb443ead42777a0230b73aec0cee7fb298.zip op-kernel-dev-4cf808eb443ead42777a0230b73aec0cee7fb298.tar.gz | |
[PATCH] Handle holes in node mask in node fallback list setup
Change the find_next_best_node algorithm to correctly skip
over holes in the node online mask. Previously it would not handle
missing nodes correctly and cause crashes at boot.
[Written by Linus, tested by AK]
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | mm/page_alloc.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 62c1225..208812b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1541,29 +1541,29 @@ static int __initdata node_load[MAX_NUMNODES]; */ static int __init find_next_best_node(int node, nodemask_t *used_node_mask) { - int i, n, val; + int n, val; int min_val = INT_MAX; int best_node = -1; - for_each_online_node(i) { - cpumask_t tmp; + /* Use the local node if we haven't already */ + if (!node_isset(node, *used_node_mask)) { + node_set(node, *used_node_mask); + return node; + } - /* Start from local node */ - n = (node+i) % num_online_nodes(); + for_each_online_node(n) { + cpumask_t tmp; /* Don't want a node to appear more than once */ if (node_isset(n, *used_node_mask)) continue; - /* Use the local node if we haven't already */ - if (!node_isset(node, *used_node_mask)) { - best_node = node; - break; - } - /* Use the distance array to find the distance */ val = node_distance(node, n); + /* Penalize nodes under us ("prefer the next node") */ + val += (n < node); + /* Give preference to headless and unused nodes */ tmp = node_to_cpumask(n); if (!cpus_empty(tmp)) |
