Re: [BENCHMARK] 12% improvement in fork load from mm3 to mm4

From: rwhron@earthlink.net
Date: Mon Jun 09 2003 - 17:02:55 EST


> autoconf build test creates about 1.2 million processes in
> 35 minutes. On quad xeon, there was an improvement of
> ~ 12% between 2.5.70-mm3 and 2.5.70-mm4.
>
> Avg of 3 runs
> 2.5.70-mm3 829.0
> 2.5.70-mm4 737.9

profile shows the biggest change is in do_page_fault.

                    2.5.70-mm4 2.5.70-mm3
                 total 478507 521921
          default_idle 229230 231410
         do_page_fault 53727 103744
         pte_alloc_one 22227 21114
           system_call 21589 21750
         kunmap_atomic 17231 17091
               copy_mm 14913 13690
          copy_process 14514 12789
        flush_tlb_page 10946 11092
           sigprocmask 9478 9038
          release_task 7553 7243
           exit_notify 5923 5257
            copy_files 5473 5143
          do_sigaction 5249 5200
    sys_rt_sigprocmask 4831 4596
   current_kernel_time 4729 4428
           kmap_atomic 4566 4309
              schedule 4430 3903
       dup_task_struct 3741 3281
 get_signal_to_deliver 2255 2177
               do_exit 2096 1985
         schedule_tail 2002 1852
         ret_from_intr 1511 2298
      sys_rt_sigaction 1473 1367
          flush_tlb_mm 1419 1060
              old_mmap 1186 1096
             sys_wait4 1115 1332
           setup_frame 982 550
        del_timer_sync 963 968
      do_flush_tlb_all 950 879
               do_fork 912 768
             sys_mmap2 906 844
               mm_init 889 909
          syscall_exit 888 951
             __wake_up 886 814
 flush_signal_handlers 855 758
wake_up_forked_process 845 826
                 mmput 842 879
      put_files_struct 818 899
      .text.lock.fault 808 1489
      release_x86_irqs 754 505
         handle_signal 677 424
      wait_task_zombie 654 684
      setup_sigcontext 569 285
      count_open_files 525 399
           copy_thread 474 407
              mm_alloc 473 483
          syscall_call 453 524
     remove_wait_queue 449 463
            error_code 446 713
    restore_sigcontext 435 286
         sys_sigreturn 431 373
      init_new_context 424 327
        get_jiffies_64 412 344
        add_wait_queue 388 325
        eligible_child 374 378
            mm_release 369 316

-- 
Randy Hron
http://home.earthlink.net/~rwhron/kernel/bigbox.html

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