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| author | Yury Norov <yury.norov@gmail.com> | 2023-08-19 16:12:33 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-09-15 13:48:09 +0200 |
| commit | b1f099b1cf51d553c510c6c8141c27d9ba7ea1fe (patch) | |
| tree | e126ab3ac7fd278ee7fb1dbd353f91d09f7d7950 /mm/mempolicy.c | |
| parent | sched: Assert for_each_thread() is properly locked (diff) | |
| download | linux-b1f099b1cf51d553c510c6c8141c27d9ba7ea1fe.tar.xz linux-b1f099b1cf51d553c510c6c8141c27d9ba7ea1fe.zip | |
numa: Generalize numa_map_to_online_node()
The function in fact searches the nearest node for a given one,
based on a N_ONLINE state. This is a common pattern to search
for a nearest node.
This patch converts numa_map_to_online_node() to numa_nearest_node()
so that others won't need to opencode the logic.
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Link: https://lore.kernel.org/r/20230819141239.287290-2-yury.norov@gmail.com
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 42b5567e3773..d4c0fff79758 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -131,22 +131,26 @@ static struct mempolicy default_policy = { static struct mempolicy preferred_node_policy[MAX_NUMNODES]; /** - * numa_map_to_online_node - Find closest online node + * numa_nearest_node - Find nearest node by state * @node: Node id to start the search + * @state: State to filter the search * - * Lookup the next closest node by distance if @nid is not online. + * Lookup the closest node by distance if @nid is not in state. * - * Return: this @node if it is online, otherwise the closest node by distance + * Return: this @node if it is in state, otherwise the closest node by distance */ -int numa_map_to_online_node(int node) +int numa_nearest_node(int node, unsigned int state) { int min_dist = INT_MAX, dist, n, min_node; - if (node == NUMA_NO_NODE || node_online(node)) + if (state >= NR_NODE_STATES) + return -EINVAL; + + if (node == NUMA_NO_NODE || node_state(node, state)) return node; min_node = node; - for_each_online_node(n) { + for_each_node_state(n, state) { dist = node_distance(node, n); if (dist < min_dist) { min_dist = dist; @@ -156,7 +160,7 @@ int numa_map_to_online_node(int node) return min_node; } -EXPORT_SYMBOL_GPL(numa_map_to_online_node); +EXPORT_SYMBOL_GPL(numa_nearest_node); struct mempolicy *get_task_policy(struct task_struct *p) { |