From: mats.liljegren@enea•com (Mats Liljegren)
To: linux-arm-kernel@lists•infradead.org
Subject: Porting 3.8-rc4-nohz3 to ARM (PandaBoard)
Date: Mon, 11 Feb 2013 20:03:17 +0100 [thread overview]
Message-ID: <20130211190317.GA8513@enea.se> (raw)
In-Reply-To: <CAFTL4hyNZdjmSij0DDouu0mmD5E3xApq7i=dZD941ZtCM1QyjQ@mail.gmail.com>
Frederic Weisbecker wrote:
> 2013/2/4 Mats Liljegren <mats.liljegren@enea•com>:
> > Hi Frederic,
> >
> > (Sorry for the re-post, I spelled the mailing list wrong...)
> >
> > I want to port dynticks patches 3.8-rc4-nohz3 to ARM architecture, and try it out on the PandaBoard. Initially this is for evaluating it, but if it looks promising I'd like to upstream this.
> >
> > As far as I can see the first thing to do is to implement virtual time accounting. After an initial look at the patches done for ia64, it doesn't look too difficult.
>
> No that part is handled by the core code. But you need to implement
> the context tracking arch backend.
> Here is what Li Zhong did to port it on Powerpc for example:
> https://lkml.org/lkml/2013/2/1/216
>
> > Are there any caveats I should be aware of?
>
> The generic cputime accounting only works on 64 bits archs. We'll need
> to do some safe accessors to read the kernel_stat. In the meantime you
> can do home tests by removing the CONFIG_64BIT dependency. This
> shouldn't be dangerous
>
> > Has anyone else started any work in this area that I could co-operate with?
>
> Yeah two people have been working on this. But it was several month
> ago and I haven't hear from them since then. I'm adding Geoff in Cc. I
> can't retrieve the other guy who has worked on it too.
Could the other guy be Kevin Hillman? The name has been mentioned to me but
I don't have his e-mail address.
I have stumbled across a problem, I get the following error messages during
boot:
---- Start snippet ----
[ 41.119873] INFO: task rcuo1:10 blocked for more than 20 seconds.
[ 41.126373] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 41.134765] rcuo1 D c045c5d8 0 10 2 0x00000000
[ 41.141662] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 41.150329] [<c045c880>] (schedule+0x74/0x78) from [<c00df138>] (rcu_nocb_kthread+0xdc/0x224)
[ 41.159423] [<c00df138>] (rcu_nocb_kthread+0xdc/0x224) from [<c006d830>] (kthread+0xb0/0xbc)
[ 41.168487] [<c006d830>] (kthread+0xb0/0xbc) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 41.177124] no locks held by rcuo1/10.
[ 41.181182] INFO: task rcuo1:12 blocked for more than 20 seconds.
[ 41.187683] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 41.196044] rcuo1 D c045c5d8 0 12 2 0x00000000
[ 41.202911] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 41.211578] [<c045c880>] (schedule+0x74/0x78) from [<c00df138>] (rcu_nocb_kthread+0xdc/0x224)
[ 41.220733] [<c00df138>] (rcu_nocb_kthread+0xdc/0x224) from [<c006d830>] (kthread+0xb0/0xbc)
[ 41.229705] [<c006d830>] (kthread+0xb0/0xbc) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 41.238372] no locks held by rcuo1/12.
[ 61.239868] INFO: task rcuo1:10 blocked for more than 20 seconds.
[ 61.246337] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 61.254730] rcuo1 D c045c5d8 0 10 2 0x00000000
[ 61.261596] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 61.270294] [<c045c880>] (schedule+0x74/0x78) from [<c00df138>] (rcu_nocb_kthread+0xdc/0x224)
[ 61.279357] [<c00df138>] (rcu_nocb_kthread+0xdc/0x224) from [<c006d830>] (kthread+0xb0/0xbc)
[ 61.288391] [<c006d830>] (kthread+0xb0/0xbc) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 61.297058] no locks held by rcuo1/10.
[ 61.301116] INFO: task rcuo1:12 blocked for more than 20 seconds.
[ 61.307617] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 61.315979] rcuo1 D c045c5d8 0 12 2 0x00000000
[ 61.322845] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 61.331512] [<c045c880>] (schedule+0x74/0x78) from [<c00df138>] (rcu_nocb_kthread+0xdc/0x224)
[ 61.340667] [<c00df138>] (rcu_nocb_kthread+0xdc/0x224) from [<c006d830>] (kthread+0xb0/0xbc)
[ 61.349639] [<c006d830>] (kthread+0xb0/0xbc) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 61.358306] no locks held by rcuo1/12.
[ 81.359863] INFO: task swapper/0:1 blocked for more than 20 seconds.
[ 81.366638] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 81.374999] swapper/0 D c045c5d8 0 1 0 0x00000000
[ 81.381866] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 81.390563] [<c045c880>] (schedule+0x74/0x78) from [<c0459c0c>] (schedule_timeout+0x1e4/0x244)
[ 81.399719] [<c0459c0c>] (schedule_timeout+0x1e4/0x244) from [<c0459c9c>] (schedule_timeout_uninterruptible+0x30/0x34)
[ 81.411163] [<c0459c9c>] (schedule_timeout_uninterruptible+0x30/0x34) from [<c0057a98>] (msleep+0x24/0x30)
[ 81.421508] [<c0057a98>] (msleep+0x24/0x30) from [<c0659d20>] (mount_root+0x74/0xfc)
[ 81.429748] [<c0659d20>] (mount_root+0x74/0xfc) from [<c0659ed0>] (prepare_namespace+0x128/0x18c)
[ 81.439270] [<c0659ed0>] (prepare_namespace+0x128/0x18c) from [<c044e35c>] (kernel_init+0x1cc/0x338)
[ 81.449066] [<c044e35c>] (kernel_init+0x1cc/0x338) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 81.458282] no locks held by swapper/0/1.
[ 81.462615] INFO: task rcuo1:10 blocked for more than 20 seconds.
[ 81.469085] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 81.477447] rcuo1 D c045c5d8 0 10 2 0x00000000
[ 81.484313] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 81.493011] [<c045c880>] (schedule+0x74/0x78) from [<c00df138>] (rcu_nocb_kthread+0xdc/0x224)
[ 81.502136] [<c00df138>] (rcu_nocb_kthread+0xdc/0x224) from [<c006d830>] (kthread+0xb0/0xbc)
[ 81.511169] [<c006d830>] (kthread+0xb0/0xbc) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 81.519836] no locks held by rcuo1/10.
[ 81.523834] INFO: task rcuo1:12 blocked for more than 20 seconds.
[ 81.530364] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 81.538696] rcuo1 D c045c5d8 0 12 2 0x00000000
[ 81.545562] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 81.554229] [<c045c880>] (schedule+0x74/0x78) from [<c00df138>] (rcu_nocb_kthread+0xdc/0x224)
[ 81.563354] [<c00df138>] (rcu_nocb_kthread+0xdc/0x224) from [<c006d830>] (kthread+0xb0/0xbc)
[ 81.572387] [<c006d830>] (kthread+0xb0/0xbc) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 81.581054] no locks held by rcuo1/12.
[ 101.579895] INFO: task rcuo1:10 blocked for more than 20 seconds.
[ 101.586364] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 101.594757] rcuo1 D c045c5d8 0 10 2 0x00000000
[ 101.601623] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 101.610290] [<c045c880>] (schedule+0x74/0x78) from [<c00df138>] (rcu_nocb_kthread+0xdc/0x224)
[ 101.619384] [<c00df138>] (rcu_nocb_kthread+0xdc/0x224) from [<c006d830>] (kthread+0xb0/0xbc)
[ 101.628417] [<c006d830>] (kthread+0xb0/0xbc) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 101.637084] no locks held by rcuo1/10.
[ 101.641143] INFO: task rcuo1:12 blocked for more than 20 seconds.
[ 101.647613] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 101.656005] rcuo1 D c045c5d8 0 12 2 0x00000000
[ 101.662872] [<c045c5d8>] (__schedule+0x8f4/0xa74) from [<c045c880>] (schedule+0x74/0x78)
[ 101.671539] [<c045c880>] (schedule+0x74/0x78) from [<c00df138>] (rcu_nocb_kthread+0xdc/0x224)
[ 101.680664] [<c00df138>] (rcu_nocb_kthread+0xdc/0x224) from [<c006d830>] (kthread+0xb0/0xbc)
[ 101.689636] [<c006d830>] (kthread+0xb0/0xbc) from [<c00142c8>] (ret_from_fork+0x14/0x20)
[ 101.698303] no locks held by rcuo1/12.
[ 112.400695] VFS: Unable to mount root fs via NFS, trying floppy.
[ 112.407226] List of all partitions:
[ 112.411041] No filesystem could mount root, tried:
[ 112.416351] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
[ 112.425262] CPU1: stopping
[ 112.428161] [<c001dcb8>] (unwind_backtrace+0x0/0x104) from [<c0453cb8>] (dump_stack+0x20/0x24)
[ 112.437316] [<c0453cb8>] (dump_stack+0x20/0x24) from [<c001b16c>] (handle_IPI+0xf4/0x154)
[ 112.445983] [<c001b16c>] (handle_IPI+0xf4/0x154) from [<c0008600>] (gic_handle_irq+0x68/0x84)
[ 112.455047] [<c0008600>] (gic_handle_irq+0x68/0x84) from [<c045df84>] (__irq_svc+0x44/0x58)
[ 112.463897] Exception stack(0xeda29f68 to 0xeda29fb0)
[ 112.469238] 9f60: 00000001 00000001 00000000 eda20a80 eda28000 eda28000
[ 112.477905] 9f80: c073d9c8 c06c0574 c0468c60 eda28000 c06c4f90 eda29fdc eda29f80 eda29fb0
[ 112.486572] 9fa0: c00ab854 c00156fc 20000113 ffffffff
[ 112.491943] [<c045df84>] (__irq_svc+0x44/0x58) from [<c00156fc>] (cpu_idle+0xac/0x128)
[ 112.500366] [<c00156fc>] (cpu_idle+0xac/0x128) from [<c0450a1c>] (secondary_start_kernel+0xec/0x104)
[ 112.510040] [<c0450a1c>] (secondary_start_kernel+0xec/0x104) from [<8044ff88>] (0x8044ff88)
PANIC: VFS: Unable to mount root fs on unknown-block(2,0)
---- End snipped ----
Do you have any suggestions for the best way of tracking down the cause?
Regards
Mats Liljegren
next prev parent reply other threads:[~2013-02-11 19:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-04 20:02 Porting 3.8-rc4-nohz3 to ARM (PandaBoard) Mats Liljegren
2013-02-08 16:31 ` Frederic Weisbecker
2013-02-08 17:04 ` Geoff Levand
2013-02-08 19:10 ` Mats Liljegren
2013-02-11 19:03 ` Mats Liljegren [this message]
2013-02-14 23:08 ` Kevin Hilman
2013-02-20 16:12 ` Frederic Weisbecker
2013-02-20 18:28 ` Mats Liljegren
2013-02-21 16:19 ` Frederic Weisbecker
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130211190317.GA8513@enea.se \
--to=mats.liljegren@enea$(echo .)com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox