Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5

From: Ingo Molnar (mingo_at_elte.hu)
Date: 08/31/04

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    Date:	Tue, 31 Aug 2004 22:39:00 +0200
To: Lee Revell <rlrevell@joe-job.com>

    * Lee Revell <rlrevell@joe-job.com> wrote:

    > On Tue, 2004-08-31 at 16:20, Ingo Molnar wrote:
    > > so ... could you try the patch below - does it work and how does the
    > > latency look like now? (ontop of an unmodified generic.c)
    > >
    >
    > Now it looks like this:
    >
    > preemption latency trace v1.0.2
    > -------------------------------
    > latency: 574 us, entries: 19 (19)
    > -----------------
    > | task: X/1391, uid:0 nice:0 policy:0 rt_prio:0
    > -----------------
    > => started at: cond_resched+0xd/0x40
    > => ended at: sys_ioctl+0xdf/0x290
    > =======>
    > 00000001 0.000ms (+0.000ms): touch_preempt_timing (cond_resched)
    > 00000001 0.000ms (+0.000ms): do_blank_screen (vt_ioctl)
    > 00000001 0.000ms (+0.000ms): is_console_locked (do_blank_screen)
    > 00000001 0.001ms (+0.000ms): hide_cursor (do_blank_screen)
    > 00000001 0.002ms (+0.000ms): vgacon_cursor (hide_cursor)
    > 00000001 0.004ms (+0.001ms): hide_softcursor (do_blank_screen)
    > 00000001 0.004ms (+0.000ms): is_console_locked (do_blank_screen)
    > 00000001 0.004ms (+0.000ms): vgacon_save_screen (do_blank_screen)
    > 00000001 0.005ms (+0.000ms): _mmx_memcpy (vgacon_save_screen)
    > 00000001 0.006ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy)
    > 00000001 0.481ms (+0.475ms): vgacon_blank (do_blank_screen)
    > 00000001 0.481ms (+0.000ms): vgacon_set_origin (vgacon_blank)
    > 00000001 0.573ms (+0.091ms): set_origin (vt_ioctl)
    > 00000001 0.573ms (+0.000ms): is_console_locked (set_origin)
    > 00000001 0.573ms (+0.000ms): vgacon_set_origin (set_origin)
    > 00000001 0.574ms (+0.000ms): release_console_sem (vt_ioctl)
    > 00000001 0.575ms (+0.000ms): sub_preempt_count (sys_ioctl)
    > 00000001 0.575ms (+0.000ms): _mmx_memcpy (check_preempt_timing)
    > 00000001 0.575ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy)

    hm, this doesnt seem to be an mtrr latency - this is a text-console
    blanking operation apparently running with the BKL enabled.

            Ingo
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