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Date: Sun, 26 Jan 2014 13:01:42 -0800 From: Yinghai Lu <yinghai@...nel.org> To: Ingo Molnar <mingo@...nel.org> Cc: "H. Peter Anvin" <hpa@...or.com>, Toshi Kani <toshi.kani@...com>, Thomas Gleixner <tglx@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org>, David Rientjes <rientjes@...gle.com>, linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org> Subject: [PATCH v2] x86, mm: Avoid duplicated pxm_to_node() calling. 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 <yinghai@...nel.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]); } } -- 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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