Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 21 Sep 2002 16:05:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 21 Sep 2002 16:05:42 -0400 Received: from franka.aracnet.com ([216.99.193.44]:61674 "EHLO franka.aracnet.com") by vger.kernel.org with ESMTP id ; Sat, 21 Sep 2002 16:05:41 -0400 Date: Sat, 21 Sep 2002 13:09:12 -0700 From: "Martin J. Bligh" To: linux-kernel cc: Dipankar Sarma , LSE Subject: dcache RCU reduces system time for kernel compile by 10% Message-ID: <2441951.1032613752@[10.10.2.3]> X-Mailer: Mulberry/2.1.2 (Win32) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2935 Lines: 67 Installing dcache rcu drops system time for a kernel compile from 52.7s to 47.3s - a little better than 10% reduction. Total elapsed time doesn't change much, but I think this is due to the lack of parallelism in the benchmark ... I need to start running 32 parallel kernel compiles ;-) Results were from a 16 cpu NUMA-Q. Comparison done on 2.5.36-mm1 Profile head before RCU: 6964 do_anonymous_page 4297 .text.lock.namei 4189 page_remove_rmap 2261 page_add_rmap 2245 __generic_copy_from_user 2217 .text.lock.dec_and_lock 1685 vm_enough_memory 1539 zap_pte_range 1503 file_read_actor 1389 rmqueue 1139 find_get_page 1074 get_empty_filp 1063 do_no_page 975 link_path_walk 863 __fput 838 path_lookup 833 __free_pages_ok 810 atomic_dec_and_lock 793 __d_lookup 737 do_page_fault 670 .text.lock.file_table 593 dput 577 pte_alloc_one 554 __generic_copy_to_user profile head after RCU: 6841 do_anonymous_page 4171 page_remove_rmap 2423 __generic_copy_from_user 2321 page_add_rmap 2247 d_lookup 1773 vm_enough_memory 1566 zap_pte_range 1527 file_read_actor 1342 rmqueue 1281 .text.lock.file_table 1153 find_get_page 1149 get_empty_filp 1049 do_no_page 891 atomic_dec_and_lock 775 do_page_fault 752 __free_pages_ok 667 follow_mount 549 __fput 535 pte_alloc_one 529 do_generic_file_read 521 path_lookup 517 schedule 509 release_pages 504 do_softirq - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/