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SubjectRe: [patch] voluntary-preempt-2.6.8.1-P4
From
Date
The following latency trace is generated each time the sound driver is opened
by an application on my box.

# lspci -s 00:06.0
00:06.0 Multimedia audio controller: nVidia Corporation nForce3 Audio (rev a2)

Audio driver:
# lsmod|grep snd
snd_seq 51856 0
snd_intel8x0 30600 0
snd_ac97_codec 66820 1 snd_intel8x0
snd_pcm 88264 1 snd_intel8x0
snd_timer 22596 2 snd_seq,snd_pcm
snd_page_alloc 9288 2 snd_intel8x0,snd_pcm
snd_mpu401_uart 6656 1 snd_intel8x0
snd_rawmidi 21156 1 snd_mpu401_uart
snd_seq_device 7176 2 snd_seq,snd_rawmidi
snd 48804 8 snd_seq,snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device
soundcore 7840 1 snd


preemption latency trace v1.0.1
-------------------------------
latency: 50752 us, entries: 267 (267)
-----------------
| task: artsd/2502, uid:500 nice:0 policy:0 rt_prio:0
-----------------
=> started at: voluntary_resched+0x31/0x60
=> ended at: sys_ioctl+0xf4/0x2b0
=======>
0.000ms (+0.000ms): touch_preempt_timing (voluntary_resched)
0.000ms (+0.000ms): snd_power_wait (snd_pcm_prepare)
0.000ms (+0.000ms): snd_pcm_action_lock_irq (snd_pcm_prepare)
0.001ms (+0.000ms): snd_pcm_action_single (snd_pcm_action_lock_irq)
0.001ms (+0.000ms): snd_pcm_pre_prepare (snd_pcm_action_single)
0.001ms (+0.000ms): snd_pcm_do_prepare (snd_pcm_action_single)
0.001ms (+0.000ms): snd_intel8x0_pcm_prepare (snd_pcm_do_prepare)
0.002ms (+0.000ms): snd_intel8x0_setup_pcm_out (snd_intel8x0_pcm_prepare)
0.002ms (+0.000ms): igetdword (snd_intel8x0_setup_pcm_out)
0.002ms (+0.000ms): iputdword (snd_intel8x0_setup_pcm_out)
0.003ms (+0.000ms): __const_udelay (snd_intel8x0_setup_pcm_out)
0.003ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
0.003ms (+0.000ms): delay_pmtmr (__delay)
0.995ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
0.995ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
0.995ms (+0.000ms): delay_pmtmr (__delay)
1.986ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
1.986ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
1.986ms (+0.000ms): delay_pmtmr (__delay)
2.978ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
2.978ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
2.978ms (+0.000ms): delay_pmtmr (__delay)
3.969ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
3.969ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
3.970ms (+0.000ms): delay_pmtmr (__delay)
4.961ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
4.961ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
4.961ms (+0.000ms): delay_pmtmr (__delay)
5.953ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
5.953ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
5.953ms (+0.000ms): delay_pmtmr (__delay)
6.944ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
6.944ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
6.944ms (+0.000ms): delay_pmtmr (__delay)
7.936ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
7.936ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
7.936ms (+0.000ms): delay_pmtmr (__delay)
8.927ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
8.927ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
8.927ms (+0.000ms): delay_pmtmr (__delay)
9.919ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
9.919ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
9.919ms (+0.000ms): delay_pmtmr (__delay)
10.910ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
10.910ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
10.911ms (+0.000ms): delay_pmtmr (__delay)
11.902ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
11.902ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
11.902ms (+0.000ms): delay_pmtmr (__delay)
12.893ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
12.894ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
12.894ms (+0.000ms): delay_pmtmr (__delay)
13.885ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
13.885ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
13.885ms (+0.000ms): delay_pmtmr (__delay)
14.877ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
14.877ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
14.877ms (+0.000ms): delay_pmtmr (__delay)
15.868ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
15.868ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
15.868ms (+0.000ms): delay_pmtmr (__delay)
16.860ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
16.860ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
16.860ms (+0.000ms): delay_pmtmr (__delay)
17.851ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
17.851ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
17.851ms (+0.000ms): delay_pmtmr (__delay)
18.843ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
18.843ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
18.843ms (+0.000ms): delay_pmtmr (__delay)
19.834ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
19.835ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
19.835ms (+0.000ms): delay_pmtmr (__delay)
20.826ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
20.826ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
20.826ms (+0.000ms): delay_pmtmr (__delay)
21.818ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
21.818ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
21.818ms (+0.000ms): delay_pmtmr (__delay)
22.809ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
22.809ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
22.809ms (+0.000ms): delay_pmtmr (__delay)
23.801ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
23.801ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
23.801ms (+0.000ms): delay_pmtmr (__delay)
24.792ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
24.792ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
24.792ms (+0.000ms): delay_pmtmr (__delay)
25.784ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
25.784ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
25.784ms (+0.000ms): delay_pmtmr (__delay)
26.775ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
26.775ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
26.776ms (+0.000ms): delay_pmtmr (__delay)
27.767ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
27.767ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
27.767ms (+0.000ms): delay_pmtmr (__delay)
28.759ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
28.759ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
28.759ms (+0.000ms): delay_pmtmr (__delay)
29.750ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
29.750ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
29.750ms (+0.000ms): delay_pmtmr (__delay)
30.742ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
30.742ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
30.742ms (+0.000ms): delay_pmtmr (__delay)
31.733ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
31.733ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
31.733ms (+0.000ms): delay_pmtmr (__delay)
32.725ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
32.725ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
32.725ms (+0.000ms): delay_pmtmr (__delay)
33.716ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
33.716ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
33.717ms (+0.000ms): delay_pmtmr (__delay)
34.708ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
34.708ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
34.708ms (+0.000ms): delay_pmtmr (__delay)
35.700ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
35.700ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
35.700ms (+0.000ms): delay_pmtmr (__delay)
36.691ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
36.691ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
36.691ms (+0.000ms): delay_pmtmr (__delay)
37.683ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
37.683ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
37.683ms (+0.000ms): delay_pmtmr (__delay)
38.674ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
38.674ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
38.674ms (+0.000ms): delay_pmtmr (__delay)
39.666ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
39.666ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
39.666ms (+0.000ms): delay_pmtmr (__delay)
40.657ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
40.657ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
40.657ms (+0.000ms): delay_pmtmr (__delay)
41.649ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
41.649ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
41.649ms (+0.000ms): delay_pmtmr (__delay)
42.640ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
42.641ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
42.641ms (+0.000ms): delay_pmtmr (__delay)
43.632ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
43.632ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
43.632ms (+0.000ms): delay_pmtmr (__delay)
44.624ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
44.624ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
44.624ms (+0.000ms): delay_pmtmr (__delay)
45.615ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
45.615ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
45.615ms (+0.000ms): delay_pmtmr (__delay)
46.607ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
46.607ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
46.607ms (+0.000ms): delay_pmtmr (__delay)
47.598ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
47.598ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
47.598ms (+0.000ms): delay_pmtmr (__delay)
48.590ms (+0.991ms): __const_udelay (snd_intel8x0_setup_pcm_out)
48.590ms (+0.000ms): __delay (snd_intel8x0_setup_pcm_out)
48.590ms (+0.000ms): delay_pmtmr (__delay)
49.581ms (+0.991ms): iputdword (snd_intel8x0_setup_pcm_out)
49.582ms (+0.000ms): snd_intel8x0_setup_periods (snd_intel8x0_pcm_prepare)
49.582ms (+0.000ms): iputdword (snd_intel8x0_setup_periods)
49.585ms (+0.002ms): iputbyte (snd_intel8x0_setup_periods)
49.585ms (+0.000ms): iputbyte (snd_intel8x0_setup_periods)
49.586ms (+0.000ms): iputbyte (snd_intel8x0_setup_periods)
49.586ms (+0.000ms): snd_pcm_do_reset (snd_pcm_action_single)
49.586ms (+0.000ms): snd_pcm_lib_ioctl (snd_pcm_do_reset)
49.586ms (+0.000ms): snd_pcm_lib_ioctl_reset (snd_pcm_do_reset)
49.587ms (+0.000ms): snd_pcm_post_prepare (snd_pcm_action_single)
49.587ms (+0.000ms): smp_apic_timer_interrupt (snd_pcm_action_lock_irq)
49.587ms (+0.000ms): profile_hook (smp_apic_timer_interrupt)
49.588ms (+0.000ms): notifier_call_chain (profile_hook)
49.588ms (+0.000ms): do_IRQ (snd_pcm_action_lock_irq)
49.589ms (+0.000ms): ack_edge_ioapic_irq (do_IRQ)
49.589ms (+0.000ms): generic_redirect_hardirq (do_IRQ)
49.589ms (+0.000ms): wake_up_process (generic_redirect_hardirq)
49.589ms (+0.000ms): try_to_wake_up (wake_up_process)
49.589ms (+0.000ms): task_rq_lock (try_to_wake_up)
49.589ms (+0.000ms): activate_task (try_to_wake_up)
49.589ms (+0.000ms): sched_clock (activate_task)
49.590ms (+0.000ms): recalc_task_prio (activate_task)
49.590ms (+0.000ms): effective_prio (recalc_task_prio)
49.590ms (+0.000ms): enqueue_task (activate_task)
49.590ms (+0.000ms): preempt_schedule (try_to_wake_up)
49.590ms (+0.000ms): preempt_schedule (do_IRQ)
49.591ms (+0.000ms): do_IRQ (snd_pcm_action_lock_irq)
49.591ms (+0.000ms): ack_edge_ioapic_irq (do_IRQ)
49.591ms (+0.000ms): generic_redirect_hardirq (do_IRQ)
49.591ms (+0.000ms): preempt_schedule (do_IRQ)
49.591ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
49.591ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event)
49.592ms (+0.000ms): mark_offset_pmtmr (timer_interrupt)
49.598ms (+0.006ms): do_timer (timer_interrupt)
49.598ms (+0.000ms): update_process_times (do_timer)
49.598ms (+0.000ms): update_one_process (update_process_times)
49.598ms (+0.000ms): run_local_timers (update_process_times)
49.598ms (+0.000ms): raise_softirq (update_process_times)
49.598ms (+0.000ms): scheduler_tick (update_process_times)
49.598ms (+0.000ms): sched_clock (scheduler_tick)
49.599ms (+0.000ms): task_timeslice (scheduler_tick)
49.599ms (+0.000ms): update_wall_time (do_timer)
49.599ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.599ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.599ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.599ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.599ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.599ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.600ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.601ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.602ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): update_wall_time_one_tick (update_wall_time)
49.603ms (+0.000ms): generic_note_interrupt (do_IRQ)
49.604ms (+0.000ms): end_edge_ioapic_irq (do_IRQ)
49.604ms (+0.000ms): preempt_schedule (do_IRQ)
49.604ms (+0.000ms): do_softirq (do_IRQ)
49.604ms (+0.000ms): __do_softirq (do_softirq)
49.604ms (+0.000ms): wake_up_process (do_softirq)
49.604ms (+0.000ms): try_to_wake_up (wake_up_process)
49.604ms (+0.000ms): task_rq_lock (try_to_wake_up)
49.604ms (+0.000ms): activate_task (try_to_wake_up)
49.604ms (+0.000ms): sched_clock (activate_task)
49.604ms (+0.000ms): recalc_task_prio (activate_task)
49.605ms (+0.000ms): effective_prio (recalc_task_prio)
49.605ms (+0.000ms): enqueue_task (activate_task)
49.605ms (+0.000ms): preempt_schedule (snd_pcm_action_lock_irq)
49.605ms (+0.000ms): sub_preempt_count (sys_ioctl)

sound/pci/intel8x0.c contains:

if (chip->device_type == DEVICE_NFORCE) {
/* reset to 2ch once to keep the 6 channel data in alignment,
* to start from Front Left always
*/
iputdword(chip, ICHREG(GLOB_CNT), (cnt & 0xcfffff));
mdelay(50); /* grrr... */
} else if (chip->device_type == DEVICE_INTEL_ICH4) {
So I guess it's that mdelay(50) which is generating these (each time the
device is opened).

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