On Sat, Sep 22, 2012 at 11:59 PM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
rcu: Fix day-one dyntick-idle stall-warning bug
As mentioned in another thread this solves the same problem for ux500.
Reported/Tested-by: Linus Walleij linus.wall...@linaro.org
But now it appears that this
On Mon, Oct 01, 2012 at 10:55:11AM +0200, Linus Walleij wrote:
On Sat, Sep 22, 2012 at 11:59 PM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
rcu: Fix day-one dyntick-idle stall-warning bug
As mentioned in another thread this solves the same problem for ux500.
Reported/Tested-by:
On Sun, Sep 23, 2012 at 3:29 AM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
On Sat, Sep 22, 2012 at 01:10:43PM -0700, Paul E. McKenney wrote:
On Sat, Sep 22, 2012 at 06:42:08PM +, Paul Walmsley wrote:
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
[...]
And here is a patch. I am
On Mon, Sep 24, 2012 at 03:11:34PM +0530, Shilimkar, Santosh wrote:
On Sun, Sep 23, 2012 at 3:29 AM, Paul E. McKenney
paul...@linux.vnet.ibm.com wrote:
On Sat, Sep 22, 2012 at 01:10:43PM -0700, Paul E. McKenney wrote:
On Sat, Sep 22, 2012 at 06:42:08PM +, Paul Walmsley wrote:
On Fri,
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
On Sat, Sep 22, 2012 at 10:20:19PM +, Paul Walmsley wrote:
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
This thing has been in the kernel since about 2004, not sure why you
didn't hit it earlier.
One other data point in that regard
On Mon, Sep 24, 2012 at 09:54:00PM +, Paul Walmsley wrote:
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
On Sat, Sep 22, 2012 at 10:20:19PM +, Paul Walmsley wrote:
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
This thing has been in the kernel since about 2004, not sure why
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
On Sat, Sep 22, 2012 at 10:25:59PM +, Paul Walmsley wrote:
The recent tests here have been on Pandaboard, which is dual-CPU, but my
recollection is that I also observed the warnings on a single-core
Beagleboard. Will re-test.
On Sun, Sep 23, 2012 at 07:55:50AM +, Paul Walmsley wrote:
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
On Sat, Sep 22, 2012 at 10:25:59PM +, Paul Walmsley wrote:
The recent tests here have been on Pandaboard, which is dual-CPU, but my
recollection is that I also observed
2012/9/22 Paul E. McKenney paul...@linux.vnet.ibm.com:
On Fri, Sep 21, 2012 at 01:31:49PM -0700, Tony Lindgren wrote:
* Paul E. McKenney paul...@linux.vnet.ibm.com [120921 12:58]:
Just to make sure I understand the combinations:
o All stalls have happened when running a minimal
On Sat, Sep 22, 2012 at 05:45:12PM +0200, Frederic Weisbecker wrote:
2012/9/22 Paul E. McKenney paul...@linux.vnet.ibm.com:
On Fri, Sep 21, 2012 at 01:31:49PM -0700, Tony Lindgren wrote:
* Paul E. McKenney paul...@linux.vnet.ibm.com [120921 12:58]:
Just to make sure I understand the
Hi Paul
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
I am wondering if your system somehow figured out how to start a grace
period that had no RCU callbacks waiting for it. If that happened,
then a CONFIG_NO_HZ=y system could in theory get into a state where all
CPUs are in dyntick-idle
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
Could you please point me to a recipe for creating a minimal userspace?
Just in case it is the userspac erather than the architecture/hardware
that makes the difference.
Tony's suggestion is pretty good. Note that there may also be differences
in
On Sat, Sep 22, 2012 at 06:42:08PM +, Paul Walmsley wrote:
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
Could you please point me to a recipe for creating a minimal userspace?
Just in case it is the userspac erather than the architecture/hardware
that makes the difference.
Tony's
On Sat, Sep 22, 2012 at 06:16:15PM +, Paul Walmsley wrote:
Hi Paul
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
I am wondering if your system somehow figured out how to start a grace
period that had no RCU callbacks waiting for it. If that happened,
then a CONFIG_NO_HZ=y system
On Sat, Sep 22, 2012 at 01:10:43PM -0700, Paul E. McKenney wrote:
On Sat, Sep 22, 2012 at 06:42:08PM +, Paul Walmsley wrote:
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
Could you please point me to a recipe for creating a minimal userspace?
Just in case it is the userspac erather
Hi Paul
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
Strangely enough, I believe that I have inadvertently fixed this in
my -rcu tree:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
Nevertheless, if you get a chance to try it, I would be interested to
hear
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
And here is a patch. I am still having trouble reproducing the problem,
but figured that I should avoid serializing things.
Thanks, testing this now on v3.6-rc6. One question though about the patch
description:
All this begs the question of
On Sat, Sep 22, 2012 at 10:25:59PM +, Paul Walmsley wrote:
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
And here is a patch. I am still having trouble reproducing the problem,
but figured that I should avoid serializing things.
Thanks, testing this now on v3.6-rc6.
Very cool, thank
On Sat, Sep 22, 2012 at 10:20:19PM +, Paul Walmsley wrote:
Hi Paul
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
Strangely enough, I believe that I have inadvertently fixed this in
my -rcu tree:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
Hi Paul
On Sat, 22 Sep 2012, Paul Walmsley wrote:
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
And here is a patch. I am still having trouble reproducing the problem,
but figured that I should avoid serializing things.
Thanks, testing this now on v3.6-rc6.
Looks like you solved it!
On Sun, Sep 23, 2012 at 01:42:10AM +, Paul Walmsley wrote:
Hi Paul
On Sat, 22 Sep 2012, Paul Walmsley wrote:
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
And here is a patch. I am still having trouble reproducing the problem,
but figured that I should avoid serializing
On Sat, 22 Sep 2012, Paul E. McKenney wrote:
Very cool, thank you for your testing efforts!!!
You're welcome.
May I apply your Tested-by to this patch?
Please do:
Tested-by: Paul Walmsley p...@pwsan.com # OMAP4430
Am testing on OMAP3730 (single-core) now.
- Paul
--
To unsubscribe from
Hi Paul
On Thu, 20 Sep 2012, Paul Walmsley wrote:
On Thu, 20 Sep 2012, Paul E. McKenney wrote:
Paul Walmsley, please let me know if the config below doesn't clear things
up for you or if there is some reason why this config is infeasible.
Will certainly test it here once things settle
On Fri, 21 Sep 2012, Paul Walmsley wrote:
The config used was 'omap2plus_defconfig', and enabled CONFIG_CPU_IDLE
by hand.
One other thing I forgot to mention - CONFIG_RCU_CPU_STALL_INFO was
enabled by hand also. Below is the diff between omap2plus_defconfig and
the config that was used
cc Frederic Weisbecker - context is here:
http://marc.info/?l=linux-kernelm=134749030206016w=2
On Thu, 20 Sep 2012, Paul E. McKenney wrote:
Fair point. I am wondering whether there is some path into the idle
loop that somehow avoids telling RCU that the CPU has in face entered
idle.
On Fri, Sep 21, 2012 at 06:08:59PM +, Paul Walmsley wrote:
cc Frederic Weisbecker - context is here:
http://marc.info/?l=linux-kernelm=134749030206016w=2
On Thu, 20 Sep 2012, Paul E. McKenney wrote:
Fair point. I am wondering whether there is some path into the idle
loop that
Hi
Just did a test with CONFIG_NO_HZ=n, and no rcu_sched stall messages
appeared for 60 minutes.
Following is the diff from omap2plus_defconfig.
- Paul
--- .config 2012-09-21 12:51:19.114938954 -0600
+++ .testconfig 2012-09-21 12:51:15.686926318 -0600
@@ -69,7 +69,7 @@
# Timers subsystem
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
On Fri, Sep 21, 2012 at 06:08:59PM +, Paul Walmsley wrote:
As far as I know, our only idle entry point is in
arch/arm/common/process.c:cpu_idle().
In mainline, this is arch/arm/kernel/process.c, correct?
Indeed; sorry about that,
On Fri, Sep 21, 2012 at 07:11:14PM +, Paul Walmsley wrote:
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
On Fri, Sep 21, 2012 at 06:08:59PM +, Paul Walmsley wrote:
As far as I know, our only idle entry point is in
arch/arm/common/process.c:cpu_idle().
In mainline, this
* Paul E. McKenney paul...@linux.vnet.ibm.com [120921 12:58]:
Just to make sure I understand the combinations:
o All stalls have happened when running a minimal userspace.
o CONFIG_NO_HZ=n suppresses the stalls.
o CONFIG_RCU_FAST_NO_HZ (which depends on CONFIG_NO_HZ=y) has
On Fri, Sep 21, 2012 at 05:47:31PM +, Paul Walmsley wrote:
Hi Paul
On Thu, 20 Sep 2012, Paul Walmsley wrote:
On Thu, 20 Sep 2012, Paul E. McKenney wrote:
Paul Walmsley, please let me know if the config below doesn't clear things
up for you or if there is some reason why this
On Fri, Sep 21, 2012 at 01:31:49PM -0700, Tony Lindgren wrote:
* Paul E. McKenney paul...@linux.vnet.ibm.com [120921 12:58]:
Just to make sure I understand the combinations:
o All stalls have happened when running a minimal userspace.
o CONFIG_NO_HZ=n suppresses the stalls.
o
On Fri, Sep 21, 2012 at 12:57:17PM -0700, Paul E. McKenney wrote:
On Fri, Sep 21, 2012 at 07:11:14PM +, Paul Walmsley wrote:
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
[ . . . ]
I may take your advice of remote access to a Panda board, though that
is likely to take a bit of time
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
On Fri, Sep 21, 2012 at 05:47:31PM +, Paul Walmsley wrote:
I built an OMAP kernel from Linus' commit
4651afbbae968772efd6dc4ba461cba9b49bb9d8 (Merge branch 'for-3.6-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq). The
On Fri, Sep 21, 2012 at 10:41:14PM +, Paul Walmsley wrote:
On Fri, 21 Sep 2012, Paul E. McKenney wrote:
On Fri, Sep 21, 2012 at 05:47:31PM +, Paul Walmsley wrote:
I built an OMAP kernel from Linus' commit
4651afbbae968772efd6dc4ba461cba9b49bb9d8 (Merge branch 'for-3.6-fixes'
Hi,
On Wed, 19 Sep 2012, Paul E. McKenney wrote:
On Thu, Sep 13, 2012 at 06:52:10PM +, Paul Walmsley wrote:
On Wed, 12 Sep 2012, Paul E. McKenney wrote:
Subodh Nijsure (also CCed) reported something that might be similar on
ARM, and also reported that setting the following got
I'll give it a try on my panda later today.
B
Sent from my iPhone
On Sep 20, 2012, at 2:56 AM, Paul Walmsley p...@pwsan.com wrote:
Hi,
On Wed, 19 Sep 2012, Paul E. McKenney wrote:
On Thu, Sep 13, 2012 at 06:52:10PM +, Paul Walmsley wrote:
On Wed, 12 Sep 2012, Paul E. McKenney
On Sep 20, 2012, at 2:56 AM, Paul Walmsley wrote:
Hi,
On Wed, 19 Sep 2012, Paul E. McKenney wrote:
On Thu, Sep 13, 2012 at 06:52:10PM +, Paul Walmsley wrote:
On Wed, 12 Sep 2012, Paul E. McKenney wrote:
Subodh Nijsure (also CCed) reported something that might be similar on
ARM,
On Thu, Sep 20, 2012 at 09:49:13PM +, Bruce, Becky wrote:
On Sep 20, 2012, at 2:56 AM, Paul Walmsley wrote:
Hi,
On Wed, 19 Sep 2012, Paul E. McKenney wrote:
On Thu, Sep 13, 2012 at 06:52:10PM +, Paul Walmsley wrote:
On Wed, 12 Sep 2012, Paul E. McKenney wrote:
On Thu, 20 Sep 2012, Paul E. McKenney wrote:
On Thu, Sep 20, 2012 at 09:49:13PM +, Bruce, Becky wrote:
OK, people, you can stop heckling me about sent from my iPhone - I'm in
the wilds of rural Louisiana with really bad internet service and was
trying to work on my phone (but, alas,
On Thu, Sep 20, 2012 at 10:47:25PM +, Paul Walmsley wrote:
On Thu, 20 Sep 2012, Paul E. McKenney wrote:
On Thu, Sep 20, 2012 at 09:49:13PM +, Bruce, Becky wrote:
OK, people, you can stop heckling me about sent from my iPhone - I'm in
the wilds of rural Louisiana with really
On Thu, Sep 13, 2012 at 06:52:10PM +, Paul Walmsley wrote:
Hi Paul,
thanks for the reply,
On Wed, 12 Sep 2012, Paul E. McKenney wrote:
Interesting. I am assuming that the interrupt in the stack below came
from idle, if not, please let me know what.
According to the exception
Hi Paul,
thanks for the reply,
On Wed, 12 Sep 2012, Paul E. McKenney wrote:
Interesting. I am assuming that the interrupt in the stack below came
from idle, if not, please let me know what.
According to the exception stack section in the original traceback, it
appears that the serial
Hi Paul
Recently several of us have been seeing INFO: rcu_sched self-detected
stall on CPU { 0} (t=20611 jiffies) stack tracebacks on various OMAP3
and 4 board.
I only noticed it during v3.6-rc3, but I suspect it's been happening
for users at least since May:
On Wed, Sep 12, 2012 at 10:51:30PM +, Paul Walmsley wrote:
Hi Paul
Recently several of us have been seeing INFO: rcu_sched self-detected
stall on CPU { 0} (t=20611 jiffies) stack tracebacks on various OMAP3
and 4 board.
I only noticed it during v3.6-rc3, but I suspect it's been
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