Re: [uml-devel] [PATCH v3] um: Switch clocksource to hrtimers

[Anton Ivanov <anton.ivanov@kot-begemot.co.uk>]

On 02/11/15 10:01, Richard Weinberger wrote:
> Am 02.11.2015 um 10:53 schrieb Anton Ivanov:
>> [snip]
>>
>>>>> I'm pretty sure that you don't see the issue as your Jessy userspace uses nanosleep periodically.
>>>> There are quite a few things running so this may indeed be the case.
>>>>
>>>> What do you use for userspace (so I can try to reproduce this and debug it)?
>>> Debian Squeeze amd64 with almost nothing running.
>>>
>>>     PID TTY      STAT   TIME COMMAND
>>>       2 ?        S      0:00 [kthreadd]
>>>       3 ?        S      0:00  \_ [ksoftirqd/0]
>>>       4 ?        S      0:00  \_ [kworker/0:0]
>>>       5 ?        S<     0:00  \_ [kworker/0:0H]
>>>       6 ?        S      0:00  \_ [kworker/u2:0]
>>>       7 ?        S      0:00  \_ [kdevtmpfs]
>>>       8 ?        S<     0:00  \_ [netns]
>>>       9 ?        S<     0:00  \_ [writeback]
>>>      10 ?        S      0:00  \_ [kworker/u2:1]
>>>      11 ?        S<     0:00  \_ [crypto]
>>>      12 ?        S      0:00  \_ [kworker/0:1]
>>>      13 ?        S<     0:00  \_ [bioset]
>>>      14 ?        S<     0:00  \_ [kblockd]
>>>      15 ?        S      0:00  \_ [kswapd0]
>>>      68 ?        S      0:00  \_ [fsnotify_mark]
>>>     221 ?        S<     0:00  \_ [bioset]
>>>     229 ?        S<     0:00  \_ [deferwq]
>>>     231 ?        S      0:00  \_ [jbd2/ubda-8]
>>>     232 ?        S<     0:00  \_ [ext4-rsv-conver]
>>>     233 ?        S<     0:00  \_ [kworker/0:1H]
>>>       1 ?        Ss     0:00 init [2]
>>>     271 ?        S<s    0:00 udevd --daemon
>>>     297 ?        S<     0:00  \_ udevd --daemon
>>>     298 ?        S<     0:00  \_ udevd --daemon
>>>     549 ?        Sl     0:00 /usr/sbin/rsyslogd -c4
>>>     580 ?        Ss     0:00 /usr/sbin/cron
>>>     595 ?        Ss     0:00 /usr/bin/dbus-daemon --system
>>>     609 ?        Ss     0:00 /usr/sbin/sshd
>>>     628 tty0     Ss     0:00 /bin/login --
>>>     631 tty0     S      0:00  \_ -bash
>>>     636 tty0     R+     0:00      \_ ps fax
>>>     629 tty1     Ss+    0:00 /sbin/getty 38400 tty1 linux
>>>     630 ttyS0    Ss+    0:00 /sbin/getty 115200 ttyS0 linux
>> I cannot reproduce that by dropping jessie into single user mode so I am going to build a squeeze image and re-test with that.
> I can also reproduce using init=/bin/bash.

I may have to use that. There is a recurring sleep 1 in one of the 
scripts in udev on sarge which results in enough nanosleeps for this not 
to show up on an "out-of-the-box" sarge build.

A.

>
> Thanks,
> //richard
>
>


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