On Tue, 23 Nov 2004 18:58:23 +0100 Ingo Molnar 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