Hi Sebastian,
First of all, thanks for your work!
On 2013/6/8 4:59, Sebastian Andrzej Siewior wrote:
> * Sebastian Andrzej Siewior | 2013-06-07 22:50:48 [+0200]:
>
>> * Qiang Huang | 2013-04-25 17:01:18 [+0800]:
>>
>>> select_fallback_rq() is called and PF_THREAD_BOUND is cleared. In my
>>> box, 1/3 bounded kernel threads will clear that flag after boot.
>>
>> Please tell me _which_ threads lose this flag. I don't see this…
>
> The only way I lose this flag is by starting a workqueue on a CPU which
> if offline. Now that is wrong. I am not sure if the workqueue re-uses
How do you judge a thread lost PF_THREAD_BOUND flag or not?
My way is:
# for pid in `ps -e -o pid`; do taskset -p -c 0-15 $pid; done
taskset: failed to parse pid: 'PID'
pid 1's current affinity list: 0-7
pid 1's new affinity list: 0-7
pid 2's current affinity list: 0-7
pid 2's new affinity list: 0-7
pid 3's current affinity list: 0
taskset: failed to set pid 3's affinity: Invalid argument
pid 4's current affinity list: 0
taskset: failed to set pid 4's affinity: Invalid argument
pid 6's current affinity list: 0
taskset: failed to set pid 6's affinity: Invalid argument
pid 7's current affinity list: 1
taskset: failed to set pid 7's affinity: Invalid argument
pid 8's current affinity list: 1
taskset: failed to set pid 8's affinity: Invalid argument
pid 9's current affinity list: 1
taskset: failed to set pid 9's affinity: Invalid argument
pid 11's current affinity list: 2
taskset: failed to set pid 11's affinity: Invalid argument
pid 13's current affinity list: 2
taskset: failed to set pid 13's affinity: Invalid argument
pid 14's current affinity list: 3
taskset: failed to set pid 14's affinity: Invalid argument
pid 16's current affinity list: 3
taskset: failed to set pid 16's affinity: Invalid argument
pid 17's current affinity list: 4
pid 17's new affinity list: 0-7 // [migration/4]
pid 18's current affinity list: 4
pid 18's new affinity list: 0-7 // [kworker/4:0]
pid 19's current affinity list: 4
pid 19's new affinity list: 0-7 // [ksoftirqd/4]
pid 20's current affinity list: 5
pid 20's new affinity list: 0-7 // [migration/5]
pid 21's current affinity list: 5
pid 21's new affinity list: 0-7 // [kworker/5:0]
pid 22's current affinity list: 5
pid 22's new affinity list: 0-7 // [ksoftirqd/5]
pid 23's current affinity list: 6
pid 23's new affinity list: 0-7 // [migration/6]
pid 25's current affinity list: 6
pid 25's new affinity list: 0-7 // [ksoftirqd/6]
pid 26's current affinity list: 7
pid 26's new affinity list: 0-7 // [migration/7]
pid 27's current affinity list: 7
pid 27's new affinity list: 0-7 // [kworker/7:0]
pid 28's current affinity list: 7
pid 28's new affinity list: 0-7 // [ksoftirqd/7]
pid 29's current affinity list: 0-7
taskset: failed to set pid 29's affinity: Invalid argument
pid 30's current affinity list: 0-7
taskset: failed to set pid 30's affinity: Invalid argument
pid 31's current affinity list: 0-7
pid 31's new affinity list: 0-7
pid 32's current affinity list: 0-7
taskset: failed to set pid 32's affinity: Invalid argument
pid 33's current affinity list: 0-7
pid 33's new affinity list: 0-7
pid 34's current affinity list: 0-7
pid 34's new affinity list: 0-7
pid 35's current affinity list: 0-7
taskset: failed to set pid 35's affinity: Invalid argument
pid 36's current affinity list: 0-7
taskset: failed to set pid 36's affinity: Invalid argument
pid 37's current affinity list: 0-7
taskset: failed to set pid 37's affinity: Invalid argument
pid 39's current affinity list: 0-7
pid 39's new affinity list: 0-7
pid 40's current affinity list: 4-7
pid 40's new affinity list: 0-7
pid 41's current affinity list: 0-3
pid 41's new affinity list: 0-7
pid 42's current affinity list: 0-7
pid 42's new affinity list: 0-7
pid 43's current affinity list: 0-7
pid 43's new affinity list: 0-7
pid 44's current affinity list: 0-7
taskset: failed to set pid 44's affinity: Invalid argument
pid 47's current affinity list: 0-7
taskset: failed to set pid 47's affinity: Invalid argument
pid 48's current affinity list: 6
pid 48's new affinity list: 0-7 // [kworker/6:1]
pid 49's current affinity list: 0-7
taskset: failed to set pid 49's affinity: Invalid argument
pid 95's current affinity list: 0-7
pid 95's new affinity list: 0-7
pid 103's current affinity list: 0-7
taskset: failed to set pid 103's affinity: Invalid argument
pid 108's current affinity list: 0-7
pid 108's new affinity list: 0-7
pid 109's current affinity list: 0-7
pid 109's new affinity list: 0-7
pid 110's current affinity list: 0-7
taskset: failed to set pid 110's affinity: Invalid argument
pid 111's current affinity list: 0-7
taskset: failed to set pid 111's affinity: Invalid argument
pid 112's current affinity list: 0-7
pid 112's new affinity list: 0-7
pid 113's current affinity list: 0-7
pid 113's new affinity list: 0-7
pid 114's current affinity list: 3
taskset: failed to set pid 114's affinity: Invalid argument
pid 115's current affinity list: 2
pid 115's new affinity list: 0-7 // [kworker/2:1]
pid 116's current affinity list: 1
pid 116's new affinity list: 0-7 // [kworker/1:1]
pid 135's current affinity list: 0-7
taskset: failed to set pid 135's affinity: Invalid argument
pid 322's current affinity list: 0-7
pid 322's new affinity list: 0-7
pid 394's current affinity list: 6
pid 394's new affinity list: 0-7 // [kworker/6:2]
pid 395's current affinity list: 5
pid 395's new affinity list: 0-7 // [kworker/5:2]
pid 409's current affinity list: 4
pid 409's new affinity list: 0-7 // [kworker/4:2]
pid 479's current affinity list: 7
pid 479's new affinity list: 0-7 // [kworker/7:2]
pid 486's current affinity list: 0
taskset: failed to set pid 486's affinity: Invalid argument
pid 506's current affinity list: 0-7
pid 506's new affinity list: 0-7
pid 512's current affinity list: 0-7
pid 512's new affinity list: 0-7
pid 577's current affinity list: 0-7
pid 577's new affinity list: 0-7
pid 1162's current affinity list: 0-7
pid 1162's new affinity list: 0-7
pid 1715's current affinity list: 0-7
pid 1715's new affinity list: 0-7
pid 1728's current affinity list: 0-7
pid 1728's new affinity list: 0-7
pid 1744's current affinity list: 0-7
pid 1744's new affinity list: 0-7
pid 1747's current affinity list: 0-7
pid 1747's new affinity list: 0-7
pid 1810's current affinity list: 0-7
pid 1810's new affinity list: 0-7
pid 1813's current affinity list: 0-7
pid 1813's new affinity list: 0-7
pid 1814's current affinity list: 0-7
pid 1814's new affinity list: 0-7
pid 1909's current affinity list: 0-7
pid 1909's new affinity list: 0-7
pid 1926's current affinity list: 0-7
pid 1926's new affinity list: 0-7
pid 1927's current affinity list: 0-7
pid 1927's new affinity list: 0-7
pid 1928's current affinity list: 3
pid 1928's new affinity list: 0-7 // [kworker/3:2]
pid 2575's current affinity list: 0-7
pid 2575's new affinity list: 0-7
pid 2580's current affinity list: 0-7
pid 2580's new affinity list: 0-7
pid 2582's current affinity list: 2
pid 2582's new affinity list: 0-7 // [kworker/2:2]
pid 2803's current affinity list: 0-7
pid 2803's new affinity list: 0-7
pid 2805's current affinity list: 0-7
pid 2805's new affinity list: 0-7
pid 2825's current affinity list: 0-7
pid 2825's new affinity list: 0-7
pid 2834's current affinity list: 0-7
pid 2834's new affinity list: 0-7
pid 2950's current affinity list: 0-7
pid 2950's new affinity list: 0-7
pid 2963's current affinity list: 0-7
pid 2963's new affinity list: 0-7
pid 3378's current affinity list: 0-7
pid 3378's new affinity list: 0-7
pid 3383's current affinity list: 0-7
pid 3383's new affinity list: 0-7
pid 3385's current affinity list: 0-7
pid 3385's new affinity list: 0-7
pid 3451's current affinity list: 0-7
pid 3451's new affinity list: 0-7
pid 3476's current affinity list: 0-7
pid 3476's new affinity list: 0-7
pid 3477's current affinity list: 0-7
pid 3477's new affinity list: 0-7
pid 3511's current affinity list: 0-7
pid 3511's new affinity list: 0-7
pid 3529's current affinity list: 0-7
pid 3529's new affinity list: 0-7
pid 3542's current affinity list: 0-7
pid 3542's new affinity list: 0-7
pid 3551's current affinity list: 0-7
pid 3551's new affinity list: 0-7
pid 3563's current affinity list: 0-7
pid 3563's new affinity list: 0-7
pid 3564's current affinity list: 0-7
pid 3564's new affinity list: 0-7
pid 3593's current affinity list: 0-7
pid 3593's new affinity list: 0-7
pid 3594's current affinity list: 0-7
pid 3594's new affinity list: 0-7
pid 3595's current affinity list: 0-7
pid 3595's new affinity list: 0-7
pid 3596's current affinity list: 0-7
pid 3596's new affinity list: 0-7
pid 3597's current affinity list: 0-7
pid 3597's new affinity list: 0-7
pid 3598's current affinity list: 0-7
pid 3598's new affinity list: 0-7
pid 3731's current affinity list: 0-7
pid 3731's new affinity list: 0-7
pid 3732's current affinity list: 0-7
pid 3732's new affinity list: 0-7
pid 3733's current affinity list: 0-7
pid 3733's new affinity list: 0-7
pid 3744's current affinity list: 0-7
pid 3744's new affinity list: 0-7
pid 3747's current affinity list: 0-7
pid 3747's new affinity list: 0-7
pid 3748's current affinity list: 0-7
pid 3748's new affinity list: 0-7
pid 3751's current affinity list: 0-7
pid 3751's new affinity list: 0-7
pid 3757's current affinity list: 0-7
pid 3757's new affinity list: 0-7
pid 3759's current affinity list: 0-7
pid 3759's new affinity list: 0-7
pid 3760's current affinity list: 0-7
pid 3760's new affinity list: 0-7
pid 3762's current affinity list: 0-7
pid 3762's new affinity list: 0-7
pid 3767's current affinity list: 0-7
pid 3767's new affinity list: 0-7
pid 3778's current affinity list: 0-7
pid 3778's new affinity list: 0-7
pid 3781's current affinity list: 0-7
pid 3781's new affinity list: 0-7
pid 3782's current affinity list: 0-7
pid 3782's new affinity list: 0-7
pid 3864's current affinity list: 0-7
pid 3864's new affinity list: 0-7
pid 3867's current affinity list: 0-7
pid 3867's new affinity list: 0-7
pid 7452's current affinity list: 0-7
pid 7452's new affinity list: 0-7
pid 9479's current affinity list: 0-7
pid 9479's new affinity list: 0-7
pid 9482's current affinity list: 0-7
pid 9482's new affinity list: 0-7
pid 9483's current affinity list: 0-7
pid 9483's new affinity list: 0-7
pid 9531's current affinity list: 0-7
pid 9531's new affinity list: 0-7
pid 9534's current affinity list: 0-7
pid 9534's new affinity list: 0-7
pid 11555's current affinity list: 0-7
pid 11555's new affinity list: 0-7
pid 11556's current affinity list: 0-7
pid 11556's new affinity list: 0-7
pid 11559's current affinity list: 0-7
pid 11559's new affinity list: 0-7
pid 11560's current affinity list: 0-7
pid 11560's new affinity list: 0-7
pid 11592's current affinity list: 0-7
pid 11592's new affinity list: 0-7
pid 11594's current affinity list: 0-7
pid 11594's new affinity list: 0-7
pid 11595's current affinity list: 0-7
pid 11595's new affinity list: 0-7
taskset: failed to get pid 11609's affinity: No such process
As you can see, many kernel threads' affinity can be changed, which were
supposed to be attached to only one cpu, most of them are kworkers, as
well as some other kernel threads.
After applying my patch, turns out:
# for pid in `ps -e -o pid`; do taskset -p -c 0-15 $pid; done
taskset: failed to parse pid: 'PID'
pid 1's current affinity list: 0-7
pid 1's new affinity list: 0-7
pid 2's current affinity list: 0-7
pid 2's new affinity list: 0-7
pid 3's current affinity list: 0
taskset: failed to set pid 3's affinity: Invalid argument
pid 4's current affinity list: 0
taskset: failed to set pid 4's affinity: Invalid argument
pid 5's current affinity list: 0-7
taskset: failed to set pid 5's affinity: Invalid argument
pid 6's current affinity list: 0
taskset: failed to set pid 6's affinity: Invalid argument
pid 7's current affinity list: 1
taskset: failed to set pid 7's affinity: Invalid argument
pid 8's current affinity list: 1
taskset: failed to set pid 8's affinity: Invalid argument
pid 9's current affinity list: 1
taskset: failed to set pid 9's affinity: Invalid argument
pid 10's current affinity list: 0
taskset: failed to set pid 10's affinity: Invalid argument
pid 11's current affinity list: 2
taskset: failed to set pid 11's affinity: Invalid argument
pid 12's current affinity list: 2
taskset: failed to set pid 12's affinity: Invalid argument
pid 13's current affinity list: 2
taskset: failed to set pid 13's affinity: Invalid argument
pid 14's current affinity list: 3
taskset: failed to set pid 14's affinity: Invalid argument
pid 15's current affinity list: 3
taskset: failed to set pid 15's affinity: Invalid argument
pid 16's current affinity list: 3
taskset: failed to set pid 16's affinity: Invalid argument
pid 17's current affinity list: 4
taskset: failed to set pid 17's affinity: Invalid argument
pid 18's current affinity list: 4
taskset: failed to set pid 18's affinity: Invalid argument
pid 19's current affinity list: 4
taskset: failed to set pid 19's affinity: Invalid argument
pid 20's current affinity list: 5
taskset: failed to set pid 20's affinity: Invalid argument
pid 21's current affinity list: 5
taskset: failed to set pid 21's affinity: Invalid argument
pid 22's current affinity list: 5
taskset: failed to set pid 22's affinity: Invalid argument
pid 23's current affinity list: 6
taskset: failed to set pid 23's affinity: Invalid argument
pid 24's current affinity list: 6
taskset: failed to set pid 24's affinity: Invalid argument
pid 25's current affinity list: 6
taskset: failed to set pid 25's affinity: Invalid argument
pid 26's current affinity list: 7
taskset: failed to set pid 26's affinity: Invalid argument
pid 27's current affinity list: 7
taskset: failed to set pid 27's affinity: Invalid argument
pid 28's current affinity list: 7
taskset: failed to set pid 28's affinity: Invalid argument
pid 29's current affinity list: 0-7
taskset: failed to set pid 29's affinity: Invalid argument
pid 30's current affinity list: 0-7
taskset: failed to set pid 30's affinity: Invalid argument
pid 31's current affinity list: 0-7
pid 31's new affinity list: 0-7
pid 32's current affinity list: 0-7
taskset: failed to set pid 32's affinity: Invalid argument
pid 33's current affinity list: 0-7
pid 33's new affinity list: 0-7
pid 34's current affinity list: 0-7
pid 34's new affinity list: 0-7
pid 35's current affinity list: 0-7
taskset: failed to set pid 35's affinity: Invalid argument
pid 36's current affinity list: 0-7
taskset: failed to set pid 36's affinity: Invalid argument
pid 37's current affinity list: 0-7
taskset: failed to set pid 37's affinity: Invalid argument
pid 38's current affinity list: 7
taskset: failed to set pid 38's affinity: Invalid argument
pid 39's current affinity list: 0-7
pid 39's new affinity list: 0-7
pid 40's current affinity list: 4-7
pid 40's new affinity list: 0-7
pid 41's current affinity list: 0-3
pid 41's new affinity list: 0-7
pid 42's current affinity list: 0-7
pid 42's new affinity list: 0-7
pid 43's current affinity list: 0-7
pid 43's new affinity list: 0-7
pid 44's current affinity list: 0-7
taskset: failed to set pid 44's affinity: Invalid argument
pid 46's current affinity list: 4
taskset: failed to set pid 46's affinity: Invalid argument
pid 47's current affinity list: 0-7
taskset: failed to set pid 47's affinity: Invalid argument
pid 48's current affinity list: 6
taskset: failed to set pid 48's affinity: Invalid argument
pid 49's current affinity list: 0-7
taskset: failed to set pid 49's affinity: Invalid argument
pid 50's current affinity list: 0-7
taskset: failed to set pid 50's affinity: Invalid argument
pid 95's current affinity list: 0-7
pid 95's new affinity list: 0-7
pid 103's current affinity list: 0-7
taskset: failed to set pid 103's affinity: Invalid argument
pid 108's current affinity list: 0-7
pid 108's new affinity list: 0-7
pid 109's current affinity list: 0-7
pid 109's new affinity list: 0-7
pid 110's current affinity list: 0-7
taskset: failed to set pid 110's affinity: Invalid argument
pid 111's current affinity list: 0-7
taskset: failed to set pid 111's affinity: Invalid argument
pid 112's current affinity list: 0-7
pid 112's new affinity list: 0-7
pid 113's current affinity list: 0-7
pid 113's new affinity list: 0-7
pid 114's current affinity list: 3
taskset: failed to set pid 114's affinity: Invalid argument
pid 115's current affinity list: 2
taskset: failed to set pid 115's affinity: Invalid argument
pid 116's current affinity list: 1
taskset: failed to set pid 116's affinity: Invalid argument
pid 117's current affinity list: 0-7
taskset: failed to set pid 117's affinity: Invalid argument
pid 118's current affinity list: 0-7
taskset: failed to set pid 118's affinity: Invalid argument
pid 126's current affinity list: 5
taskset: failed to set pid 126's affinity: Invalid argument
pid 135's current affinity list: 0-7
taskset: failed to set pid 135's affinity: Invalid argument
pid 321's current affinity list: 0-7
pid 321's new affinity list: 0-7
pid 420's current affinity list: 7
taskset: failed to set pid 420's affinity: Invalid argument
pid 496's current affinity list: 4
taskset: failed to set pid 496's affinity: Invalid argument
pid 516's current affinity list: 5
taskset: failed to set pid 516's affinity: Invalid argument
pid 517's current affinity list: 0-7
pid 517's new affinity list: 0-7
pid 523's current affinity list: 0-7
pid 523's new affinity list: 0-7
pid 588's current affinity list: 0-7
pid 588's new affinity list: 0-7
pid 1047's current affinity list: 0
taskset: failed to set pid 1047's affinity: Invalid argument
pid 1048's current affinity list: 1
taskset: failed to set pid 1048's affinity: Invalid argument
pid 1141's current affinity list: 2
taskset: failed to set pid 1141's affinity: Invalid argument
pid 1205's current affinity list: 0-7
pid 1205's new affinity list: 0-7
pid 1758's current affinity list: 0-7
pid 1758's new affinity list: 0-7
pid 1771's current affinity list: 0-7
pid 1771's new affinity list: 0-7
pid 1787's current affinity list: 0-7
pid 1787's new affinity list: 0-7
pid 1790's current affinity list: 0-7
pid 1790's new affinity list: 0-7
pid 1853's current affinity list: 0-7
pid 1853's new affinity list: 0-7
pid 1856's current affinity list: 0-7
pid 1856's new affinity list: 0-7
pid 1857's current affinity list: 0-7
pid 1857's new affinity list: 0-7
pid 1952's current affinity list: 0-7
pid 1952's new affinity list: 0-7
pid 1956's current affinity list: 3
taskset: failed to set pid 1956's affinity: Invalid argument
pid 1979's current affinity list: 0-7
pid 1979's new affinity list: 0-7
pid 1980's current affinity list: 0-7
pid 1980's new affinity list: 0-7
pid 2617's current affinity list: 0-7
pid 2617's new affinity list: 0-7
pid 2622's current affinity list: 0-7
pid 2622's new affinity list: 0-7
pid 2844's current affinity list: 0-7
pid 2844's new affinity list: 0-7
pid 2846's current affinity list: 0-7
pid 2846's new affinity list: 0-7
pid 2866's current affinity list: 0-7
pid 2866's new affinity list: 0-7
pid 2875's current affinity list: 0-7
pid 2875's new affinity list: 0-7
pid 2991's current affinity list: 0-7
pid 2991's new affinity list: 0-7
pid 3004's current affinity list: 0-7
pid 3004's new affinity list: 0-7
pid 3410's current affinity list: 0-7
pid 3410's new affinity list: 0-7
pid 3416's current affinity list: 0-7
pid 3416's new affinity list: 0-7
pid 3426's current affinity list: 0-7
pid 3426's new affinity list: 0-7
pid 3492's current affinity list: 0-7
pid 3492's new affinity list: 0-7
pid 3509's current affinity list: 0-7
pid 3509's new affinity list: 0-7
pid 3510's current affinity list: 0-7
pid 3510's new affinity list: 0-7
pid 3552's current affinity list: 0-7
pid 3552's new affinity list: 0-7
pid 3570's current affinity list: 0-7
pid 3570's new affinity list: 0-7
pid 3576's current affinity list: 0-7
pid 3576's new affinity list: 0-7
pid 3592's current affinity list: 0-7
pid 3592's new affinity list: 0-7
pid 3613's current affinity list: 0-7
pid 3613's new affinity list: 0-7
pid 3617's current affinity list: 0-7
pid 3617's new affinity list: 0-7
pid 3634's current affinity list: 0-7
pid 3634's new affinity list: 0-7
pid 3635's current affinity list: 0-7
pid 3635's new affinity list: 0-7
pid 3636's current affinity list: 0-7
pid 3636's new affinity list: 0-7
pid 3637's current affinity list: 0-7
pid 3637's new affinity list: 0-7
pid 3638's current affinity list: 0-7
pid 3638's new affinity list: 0-7
pid 3639's current affinity list: 0-7
pid 3639's new affinity list: 0-7
pid 3773's current affinity list: 0-7
pid 3773's new affinity list: 0-7
pid 3774's current affinity list: 0-7
pid 3774's new affinity list: 0-7
pid 3775's current affinity list: 0-7
pid 3775's new affinity list: 0-7
pid 3786's current affinity list: 0-7
pid 3786's new affinity list: 0-7
pid 3789's current affinity list: 0-7
pid 3789's new affinity list: 0-7
pid 3790's current affinity list: 0-7
pid 3790's new affinity list: 0-7
pid 3793's current affinity list: 0-7
pid 3793's new affinity list: 0-7
pid 3799's current affinity list: 0-7
pid 3799's new affinity list: 0-7
pid 3801's current affinity list: 0-7
pid 3801's new affinity list: 0-7
pid 3802's current affinity list: 0-7
pid 3802's new affinity list: 0-7
pid 3804's current affinity list: 0-7
pid 3804's new affinity list: 0-7
pid 3807's current affinity list: 0-7
pid 3807's new affinity list: 0-7
pid 3809's current affinity list: 0-7
pid 3809's new affinity list: 0-7
pid 3815's current affinity list: 0-7
pid 3815's new affinity list: 0-7
pid 3820's current affinity list: 0-7
pid 3820's new affinity list: 0-7
pid 3823's current affinity list: 0-7
pid 3823's new affinity list: 0-7
pid 3824's current affinity list: 0-7
pid 3824's new affinity list: 0-7
pid 3854's current affinity list: 0-7
pid 3854's new affinity list: 0-7
pid 3857's current affinity list: 0-7
pid 3857's new affinity list: 0-7
pid 3858's current affinity list: 0-7
pid 3858's new affinity list: 0-7
pid 3888's current affinity list: 0-7
pid 3888's new affinity list: 0-7
pid 3889's current affinity list: 0-7
pid 3889's new affinity list: 0-7
pid 3922's current affinity list: 0-7
pid 3922's new affinity list: 0-7
pid 3926's current affinity list: 0-7
pid 3926's new affinity list: 0-7
taskset: failed to get pid 3952's affinity: No such process
These changing all failed. We can't change the cpu affinity of those
threads which are attached to only one cpu.
I don't kown if that's enought to say many threads' PF_THREAD_BOUND flag
is cleared which should not be. But your patches definitely not resolve
this problem, the taskset result is similar to my first one. I don't know
if this is the direct reason for the hung problem, but this is truly a
problem, right?
And my test shows the same thing, after applying your patches, my
cgroup_fj test will still cause system hung, after reboot, log message
shows the same as I sent before:
...
Jun 22 10:57:42 sles25 kernel: [ 295.223396] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.243264] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.243269] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.243318] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.245647] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.247330] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.251289] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.251396] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.273380] NOHZ: local_softirq_pending 200
Jun 22 10:57:42 sles25 kernel: [ 295.275274] NOHZ: local_softirq_pending 200
Jun 22 11:00:40 sles25 sshd[5401]: Accepted keyboard-interactive/pam for h00177757 from 128.5.64.198 port 58075 ssh2
Jun 22 11:00:40 sles25 sshd[5752]: error: bind: Address already in use
Jun 22 11:00:40 sles25 sshd[5752]: error: channel_setup_fwd_listener: cannot listen to port: 8080
Jun 22 11:03:24 sles25 kernel: [ 636.968624] ------------[ cut here ]------------
Jun 22 11:03:24 sles25 kernel: [ 636.968634] WARNING: at kernel/workqueue.c:1209 worker_enter_idle+0x102/0x150()
Jun 22 11:03:24 sles25 kernel: [ 636.968637] Hardware name: Tecal RH2285
Jun 22 11:03:24 sles25 kernel: [ 636.968639] Modules linked in: bridge stp edd cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf fuse loop dm_mod coretemp crc32c_intel
ghash_clmulni_intel usbhid aesni_intel igb hid i7core_edac ipv6 cryptd sg iTCO_wdt bnx2 edac_core button aes_x86_64 aes_generic rtc_cmos i2c_i801 i2c_core iTCO_vendor_support serio_raw dca ses
enclosure microcode pcspkr ext3 jbd mbcache uhci_hcd ehci_hcd usbcore sd_mod crc_t10dif usb_common processor thermal_sys hwmon scsi_dh_emc scsi_dh_alua scsi_dh_hp_sw scsi_dh_rdac scsi_dh ata_generic
ata_piix libata megaraid_sas scsi_mod
Jun 22 11:03:24 sles25 kernel: [ 636.968695] Pid: 1167, comm: kworker/4:2 Not tainted 3.4.24.09-hq-apply-Sebastian-patch+ #25
Jun 22 11:03:24 sles25 kernel: [ 636.968697] Call Trace:
Jun 22 11:03:24 sles25 kernel: [ 636.968703] [<ffffffff8105d5f2>] ? worker_enter_idle+0x102/0x150
Jun 22 11:03:24 sles25 kernel: [ 636.968709] [<ffffffff8104320a>] warn_slowpath_common+0x7a/0xb0
Jun 22 11:03:24 sles25 kernel: [ 636.968713] [<ffffffff81043255>] warn_slowpath_null+0x15/0x20
Jun 22 11:03:24 sles25 kernel: [ 636.968716] [<ffffffff8105d5f2>] worker_enter_idle+0x102/0x150
Jun 22 11:03:24 sles25 kernel: [ 636.968721] [<ffffffff810607f8>] worker_thread+0x248/0x430
Jun 22 11:03:24 sles25 kernel: [ 636.968725] [<ffffffff810605b0>] ? manage_workers+0x120/0x120
Jun 22 11:03:24 sles25 kernel: [ 636.968730] [<ffffffff8106546e>] kthread+0x9e/0xb0
Jun 22 11:03:24 sles25 kernel: [ 636.968736] [<ffffffff8146f7d4>] kernel_thread_helper+0x4/0x10
Jun 22 11:03:24 sles25 kernel: [ 636.968740] [<ffffffff810653d0>] ? kthread_freezable_should_stop+0x70/0x70
Jun 22 11:03:24 sles25 kernel: [ 636.968744] [<ffffffff8146f7d0>] ? gs_change+0x13/0x13
Jun 22 11:03:24 sles25 kernel: [ 636.968746] ---[ end trace 10ce88b902763137 ]---
...
So right now, my patch is still my only solution.
One thing need to be clear, my test is on 3.4.45-rt60, but I think all 3.4-rt
versions have this problem.
> the "idle" workers later. In the up path it sets the CPU mask and
> PF_THREAD_BOUND is usually set (unless it was lost due to
> select_fallback_rq()). So we can set this back on:
>
> Subject: [PATCH] kernel/workqueue: Add PF_THREAD_BOUND after set_cpu
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> ---
> kernel/workqueue.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 11285e4..aff5841 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -1637,8 +1637,10 @@ __acquires(&gcwq->lock)
> * it races with cpu hotunplug operation. Verify
> * against GCWQ_DISASSOCIATED.
> */
> - if (!(gcwq->flags & GCWQ_DISASSOCIATED))
> + if (!(gcwq->flags & GCWQ_DISASSOCIATED)) {
> set_cpus_allowed_ptr(task, get_cpu_mask(gcwq->cpu));
> + task->flags |= PF_THREAD_BOUND;
> + }
>
> spin_lock_irq(&gcwq->lock);
> if (gcwq->flags & GCWQ_DISASSOCIATED)
>
--
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