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Date: Tue, 13 Jul 2004 17:58:33 -0700
From: Andrew Morton <akpm@osdl.org>
To: Lee Revell <rlrevell@joe-job.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Ext3 vs. ReiserFS results (was Re: XRUN traces)
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Lee Revell <rlrevell@joe-job.com> wrote:
>
> Jul 13 19:51:45 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:169: XRUN: pcmC0D0p
>  Jul 13 19:51:45 mindpipe kernel:  [dump_stack+23/32] dump_stack+0x17/0x20
>  Jul 13 19:51:45 mindpipe kernel:  [__crc_totalram_pages+562733/3558647] snd_pcm_period_elapsed+0x2c7/0x400 [snd_pcm]
>  Jul 13 19:51:45 mindpipe kernel:  [__crc_totalram_pages+631725/3558647] snd_emu10k1_interrupt+0x377/0x400 [snd_emu10k1]
>  Jul 13 19:51:45 mindpipe kernel:  [handle_IRQ_event+51/96] handle_IRQ_event+0x33/0x60
>  Jul 13 19:51:45 mindpipe kernel:  [do_IRQ+165/368] do_IRQ+0xa5/0x170
>  Jul 13 19:51:45 mindpipe kernel:  [common_interrupt+24/32] common_interrupt+0x18/0x20
>  Jul 13 19:51:45 mindpipe kernel:  [d_callback+29/64] d_callback+0x1d/0x40
>  Jul 13 19:51:45 mindpipe kernel:  [rcu_do_batch+62/80] rcu_do_batch+0x3e/0x50
>  Jul 13 19:51:45 mindpipe kernel:  [rcu_process_callbacks+150/256] rcu_process_callbacks+0x96/0x100
>  Jul 13 19:51:45 mindpipe kernel:  [tasklet_action+68/112] tasklet_action+0x44/0x70
>  Jul 13 19:51:45 mindpipe kernel:  [__do_softirq+131/144] __do_softirq+0x83/0x90
>  Jul 13 19:51:45 mindpipe kernel:  [do_softirq+53/64] do_softirq+0x35/0x40
>  Jul 13 19:51:45 mindpipe kernel:  [do_IRQ+277/368] do_IRQ+0x115/0x170
>  Jul 13 19:51:45 mindpipe kernel:  [common_interrupt+24/32] common_interrupt+0x18/0x20
>  Jul 13 19:51:45 mindpipe kernel:  [poll_freewait+46/80] poll_freewait+0x2e/0x50
>  Jul 13 19:51:45 mindpipe kernel:  [sys_poll+472/544] sys_poll+0x1d8/0x220

This one's going to be a problem.  It's due to RCU freeing a large number
of dentries in one hit.