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| author |   Yinghai Lu <yinghai@kernel.org> | 2014-01-26 13:01:42 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2014-02-09 15:32:31 +0100 |
| commit | ba6a328f7dfc95b20df5e0eb33c698187e997190 (patch) | |
| tree | c881a44f413b591ada817e44b1d6374adbd8e643 /arch/x86/mm | |
| parent | Merge tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl (diff) | |
| download | linux-dev-ba6a328f7dfc95b20df5e0eb33c698187e997190.tar.xz linux-dev-ba6a328f7dfc95b20df5e0eb33c698187e997190.zip | |
x86/mm: Avoid duplicated pxm_to_node() calls
In slit init code, too many pxm_to_node() function calls are done.
We can store from_node/to_node instead of keep calling
pxm_to_node().
- Before this patch: pxm_to_node() is called n*(1+n*3) times.
- After this patch: pxm_to_node() is called n*(1+n) times.
for 8 sockets, it will be 72 instead of 200.
for 32 sockets, it will be 1056 instead of 3104.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: David Rientjes <rientjes@google.com>
Link: http://lkml.kernel.org/r/1390770102-4007-1-git-send-email-yinghai@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/srat.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c index 1953e9c9391a..66338a60aa6e 100644 --- a/arch/x86/mm/srat.c +++ b/arch/x86/mm/srat.c @@ -52,12 +52,18 @@ void __init acpi_numa_slit_init(struct acpi_table_slit *slit) 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]); } } |