From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20080208233738.108449000@polaris-admin.engr.sgi.com> Date: Fri, 08 Feb 2008 15:37:38 -0800 From: Mike Travis Subject: [PATCH 0/4] NR_CPUS: non-x86 arch specific reduction of NR_CPUS usage Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton , Ingo Molnar , Thomas Gleixner , Andi Kleen Cc: Christoph Lameter , Jack Steiner , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: Here's another round of removing static allocations of arrays using NR_CPUS to size the length. The change is to use PER_CPU variables in place of the static tables. Based on linux-2.6.git + x86.git Cc: Dave Jones Cc: cpufreq@lists.linux.org.uk Cc: Len Brown Cc: linux-acpi@vger.kernel.org Cc: Philippe Elie Cc: oprofile-list@lists.sf.net Signed-off-by: Mike Travis --- (1 - if modules enabled, does not complete boot even without this patch) x86_64 configs built and booted: ingo-stress-test(1) defconfi nonuma nosmp bigsmp (NR_CPUS=1024, 1024 possible, 8 real) Other configs built: arm-default i386-default i386-single i386-smp ppc-pmac32 ppc-smp sparc64-default sparc64-smp x86_64-8psmp x86_64-debug x86_64-default x86_64-numa x86_64-single x86_64-allmodconfig x86_64-allyesconfig x86_64-maxsmp (NR_CPUS=4096 MAXNODES=512) Configs not built due to prior errors: ia64-sn2 ia64-default ia64-nosmp ia64-zx1 s390-default sparc-default Memory effects using x86_64-maxsmp Removes 1MB from permanant data adding 440 bytes to percpu area. 4k-cpus-before 4k-cpus-after 3463036 .bss -98304 -2% 6067456 .data.cacheline_alig -1048576 -17% 48712 .data.percpu +440 +0% 14275505 .text +336 +0% 14275505 Text +336 +0% 8521495 Data -336 +0% 3463036 Bss -98304 -2% 10974520 OtherData -1048576 -9% 48712 PerCpu +440 +0% 39275796 Total -1146104 -2% -- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org