In slit init code, more pxm_to_node() calling are added.
We can store from_node/to_node instead of keep calling pxm_to_node().
After this patch: pxm_to_node() is called n*(1+n)
Before this patch: pxm_to_node() is called n*(1+n*3)
for 8 socket, it will be 72 instead of 200.
for 32 socket, it will be 1056 instead of 3104.
-v2: update title and change log according to Ingo.
move from_node/to_node in loop and change to const according to
David Rientjes.
Signed-off-by: Yinghai Lu <ying...@kernel.org>
---
arch/x86/mm/srat.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
Index: linux-2.6/arch/x86/mm/srat.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/srat.c
+++ linux-2.6/arch/x86/mm/srat.c
@@ -52,12 +52,18 @@ void __init acpi_numa_slit_init(struct a
int i, j;
for (i = 0; i < slit->locality_count; i++) {
- if (pxm_to_node(i) == NUMA_NO_NODE)
+ const int from_node = pxm_to_node(i);
+
+ if (from_node == NUMA_NO_NODE)
continue;
+
for (j = 0; j < slit->locality_count; j++) {
- if (pxm_to_node(j) == NUMA_NO_NODE)
+ const int to_node = pxm_to_node(j);
+
+ if (to_node == NUMA_NO_NODE)
continue;
- numa_set_distance(pxm_to_node(i), pxm_to_node(j),
+
+ numa_set_distance(from_node, to_node,
slit->entry[slit->locality_count * i + j]);
}
}
--
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