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Date: Mon, 10 Feb 2014 05:32:21 -0800 From: tip-bot for Yinghai Lu <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org, yinghai@...nel.org, tglx@...utronix.de, rientjes@...gle.com, toshi.kani@...com Subject: [tip:x86/mm] x86/mm: Avoid duplicated pxm_to_node() calls Commit-ID: ba6a328f7dfc95b20df5e0eb33c698187e997190 Gitweb: http://git.kernel.org/tip/ba6a328f7dfc95b20df5e0eb33c698187e997190 Author: Yinghai Lu <yinghai@...nel.org> AuthorDate: Sun, 26 Jan 2014 13:01:42 -0800 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Sun, 9 Feb 2014 15:32:31 +0100 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@...nel.org> Cc: Toshi Kani <toshi.kani@...com> Cc: David Rientjes <rientjes@...gle.com> Link: http://lkml.kernel.org/r/1390770102-4007-1-git-send-email-yinghai@kernel.org Signed-off-by: Ingo Molnar <mingo@...nel.org> --- arch/x86/mm/srat.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c index 1953e9c..66338a6 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]); } } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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