Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch

Andrew Morton
2004-07-13T09:01:55Z

Lee Revell <rlrevell@joe-job.com> wrote:
>
> > framebuffer scrolling inside lock_kernel(). Tricky. Suggest you use X or
> > vgacon. You can try removing the lock_kernel() calls from do_tty_write(),
> > but make sure you're wearing ear protection.
> >
>
> OK, I figured this was not an easy one. I can just not do that.

Why not? You can certainly try removing those [un]lock_kernel() calls.

> Here are some more. These result from using mplayer with ALSA OSS
> emulation:
>
> Jul 13 04:31:49 mindpipe kernel:
> Jul 13 04:31:49 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:169: XRUN: pcmC0D0p
> Jul 13 04:31:49 mindpipe kernel: [__crc_totalram_pages+1387264/5353478] snd_pcm_period_elapsed+0x2ca/0x410 [snd_pcm]
> Jul 13 04:31:49 mindpipe kernel: [__crc_totalram_pages+1455070/5353478] snd_emu10k1_interrupt+0x3c8/0x480 [snd_emu10k1]
> Jul 13 04:31:49 mindpipe kernel: [handle_IRQ_event+49/96] handle_IRQ_event+0x31/0x60
> Jul 13 04:31:49 mindpipe kernel: [do_IRQ+155/352] do_IRQ+0x9b/0x160
> Jul 13 04:31:49 mindpipe kernel: [common_interrupt+24/32] common_interrupt+0x18/0x20
> Jul 13 04:31:49 mindpipe kernel: [__crc_totalram_pages+1394929/5353478] snd_pcm_format_set_silence+0x4b/0x1d0 [snd_pcm]
> Jul 13 04:31:49 mindpipe kernel: [__crc_totalram_pages+2165815/5353478] snd_pcm_oss_change_params+0x5a1/0x850 [snd_pcm_oss]
> Jul 13 04:31:49 mindpipe kernel: [__crc_totalram_pages+2166620/5353478] snd_pcm_oss_get_active_substream+0x76/0x90 [snd_pcm_oss]
> Jul 13 04:31:49 mindpipe kernel: [__crc_totalram_pages+2170556/5353478] snd_pcm_oss_get_formats+0x26/0x100 [snd_pcm_oss]

Looks like those memcpys in snd_pcm_format_set_silence() are hurting.