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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-9
    On Tue, 23 Nov 2004 18:58:23 +0100
    Ingo Molnar <mingo@elte.hu> wrote:

    >
    > - added user-triggerable ALSA xrun tracing to the patch: if a
    > sound IO channel has xrun_debug enabled in /proc then
    > user_trace_stop() will be called before printing the xrun message,
    > and the current trace will be saved to /proc/latency_trace. This is a
    > 'one-shot' tracing method for now. I can be activated via:
    >
    > echo 1 > /proc/asound/card0/pcm0p/xrun_debug
    >
    > echo 1 > /proc/sys/kernel/trace_user_triggered
    > echo 1 > /proc/sys/kernel/trace_freerunning
    > echo 0 > /proc/sys/kernel/preempt_max_latency
    > echo 0 > /proc/sys/kernel/preempt_thresh
    > echo 0 > /proc/sys/kernel/preempt_wakeup_timing
    >
    > ./gettimeofday 0 1
    >
    > gettimeofday.c is attached below. The JACK fifo xrun source was found
    > via this tracing facility.

    Hi, i have some problem with unresolved symbols loading my alsa sound
    card driver with this kernel version. At first i suspected an unclean
    build, but then i did make clean bzImage modules and the unresolved
    symbols persist (i have wakeup/nonpreemptible/interrupts-off tracing
    enabled (see .config)):

    snd_pcm: Unknown symbol user_trace_stop
    snd_ac97_codec: Unknown symbol snd_interval_refine
    snd_ac97_codec: Unknown symbol snd_pcm_hw_rule_add
    snd_cs46xx: Unknown symbol snd_ac97_write_cache
    snd_cs46xx: Unknown symbol snd_pcm_new
    snd_cs46xx: Unknown symbol snd_pcm_lib_preallocate_pages_for_all
    snd_cs46xx: Unknown symbol snd_pcm_format_unsigned
    snd_cs46xx: Unknown symbol snd_pcm_format_physical_width
    snd_cs46xx: Unknown symbol snd_ac97_mixer
    snd_cs46xx: Unknown symbol snd_ac97_bus
    snd_cs46xx: Unknown symbol snd_pcm_lib_malloc_pages
    snd_cs46xx: Unknown symbol snd_pcm_lib_ioctl
    snd_cs46xx: Unknown symbol snd_pcm_lib_free_pages
    snd_cs46xx: Unknown symbol snd_pcm_set_ops
    snd_cs46xx: Unknown symbol snd_pcm_hw_constraint_list
    snd_cs46xx: Unknown symbol snd_pcm_format_big_endian
    snd_cs46xx: Unknown symbol snd_pcm_lib_preallocate_free_for_all
    snd_cs46xx: Unknown symbol snd_pcm_period_elapsed
    snd_cs46xx: Unknown symbol snd_ac97_write
    snd_cs46xx: Unknown symbol snd_ac97_read
    snd_cs46xx: Unknown symbol snd_pcm_format_width


    .config attached

    flo
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