().
Where's the EBUSY? It can throw this from __sched_setscheduler() when it
checks if there's enough bandwidth to run the task.
NOTES
While the text above (and in SCHED_SETSCHEDULER(2)) talks about
processes, in actual fact these system calls are thread specific.
--
Henrik
nk many kernelhackers leave the easy bugs "just to be nice to newbies" -
whenever a bug is discovered they are fixed.
However, I discovered http://eudyptula-challenge.org/ a little while ago.
Be warned, I haven't tested it, not sure what the challenge is like, but
might as well be a good
,
intermediate value that could overflow.
arch/tile/kernel/time.c has a similar pattern in cycles2ns, and this
copies the same pattern in this function
CC: John Stultz
CC: Mike Galbraith
CC: Salman Qazi
Signed-off-by: Henrik Austad
---
arch/tile/kernel/time.c | 10 +-
1 file changed
On Tue, Mar 04, 2014 at 08:36:28AM +0100, Mike Galbraith wrote:
> (boing boing boing... hell with it, today doesn't exist;)
you lost me at boing.. :)
> On Tue, 2014-03-04 at 08:31 +0100, Mike Galbraith wrote:
> > On Tue, 2014-03-04 at 08:20 +0100, Henrik Austad wrote:
> >
On Tue, Mar 04, 2014 at 08:36:28AM +0100, Mike Galbraith wrote:
(boing boing boing... hell with it, today doesn't exist;)
you lost me at boing.. :)
On Tue, 2014-03-04 at 08:31 +0100, Mike Galbraith wrote:
On Tue, 2014-03-04 at 08:20 +0100, Henrik Austad wrote:
On Tue, Mar 04, 2014
that could overflow.
arch/tile/kernel/time.c has a similar pattern in cycles2ns, and this
copies the same pattern in this function
CC: John Stultz johns...@us.ibm.com
CC: Mike Galbraith bitbuc...@online.de
CC: Salman Qazi sq...@google.com
Signed-off-by: Henrik Austad hen...@austad.us
---
arch/tile/kernel
to be nice to newbies -
whenever a bug is discovered they are fixed.
However, I discovered http://eudyptula-challenge.org/ a little while ago.
Be warned, I haven't tested it, not sure what the challenge is like, but
might as well be a good place to start.
Good luck!
--
Henrik Austad
< cc->shift) - 1);
> +
> + return quot * cc->mult + ((rem * cc->mult) >> cc->shift);
> }
Makes sense to me, for whatever that's worth :)
Also, tile could probably do with a similar approach for ns2cycles (not
that I have observed any problems, but in the sen
On Sat, Mar 01, 2014 at 12:08:36AM +0100, Frederic Weisbecker wrote:
> On Fri, Feb 28, 2014 at 10:40:35AM +0100, Henrik Austad wrote:
> > On Thu, Feb 27, 2014 at 02:56:20PM +0100, Frederic Weisbecker wrote:
> > > Right, or timekeeper_cpumask.
> >
> > Right, pay
On Sat, Mar 01, 2014 at 12:08:36AM +0100, Frederic Weisbecker wrote:
On Fri, Feb 28, 2014 at 10:40:35AM +0100, Henrik Austad wrote:
On Thu, Feb 27, 2014 at 02:56:20PM +0100, Frederic Weisbecker wrote:
Right, or timekeeper_cpumask.
Right, paying some attention to a proper, descriptive
with a similar approach for ns2cycles (not
that I have observed any problems, but in the sense of being consistent and
all). I'll send a patch in a separate email as not to clutter this thread
too much :)
--
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On Thu, Feb 27, 2014 at 02:56:20PM +0100, Frederic Weisbecker wrote:
> On Thu, Feb 27, 2014 at 09:37:35AM +0100, Henrik Austad wrote:
> > On Wed, Feb 26, 2014 at 02:02:42PM +0100, Frederic Weisbecker wrote:
> > >
> > > -1 could be an option but hmm...
>
On Thu, Feb 27, 2014 at 02:56:20PM +0100, Frederic Weisbecker wrote:
On Thu, Feb 27, 2014 at 09:37:35AM +0100, Henrik Austad wrote:
On Wed, Feb 26, 2014 at 02:02:42PM +0100, Frederic Weisbecker wrote:
-1 could be an option but hmm...
I don't really like -1, that indicates
On Wed, Feb 26, 2014 at 02:02:42PM +0100, Frederic Weisbecker wrote:
> On Wed, Feb 26, 2014 at 09:16:03AM +0100, Henrik Austad wrote:
> > On Tue, Feb 25, 2014 at 03:19:09PM +0100, Frederic Weisbecker wrote:
> > > On Tue, Feb 25, 2014 at 01:33:55PM +0100, Henrik Austad wrote:
&g
On Wed, Feb 26, 2014 at 02:02:42PM +0100, Frederic Weisbecker wrote:
On Wed, Feb 26, 2014 at 09:16:03AM +0100, Henrik Austad wrote:
On Tue, Feb 25, 2014 at 03:19:09PM +0100, Frederic Weisbecker wrote:
On Tue, Feb 25, 2014 at 01:33:55PM +0100, Henrik Austad wrote:
From: Henrik Austad haus
On Tue, Feb 25, 2014 at 03:19:09PM +0100, Frederic Weisbecker wrote:
> On Tue, Feb 25, 2014 at 01:33:55PM +0100, Henrik Austad wrote:
> > From: Henrik Austad
> >
> > Hi!
> >
> > This is a rework of the preiovus patch based on the feedback gathered
> > from
On Tue, Feb 25, 2014 at 03:19:09PM +0100, Frederic Weisbecker wrote:
On Tue, Feb 25, 2014 at 01:33:55PM +0100, Henrik Austad wrote:
From: Henrik Austad haus...@cisco.com
Hi!
This is a rework of the preiovus patch based on the feedback gathered
from the last round. I've split it up
From: Henrik Austad
This allows userspace to see which CPU is currently responsible for
handling the do_timer update of the time machinery.
sysctl kernel.current_timer_cpu
/proc/sys/kernel/current_timer_cpu
Note that this value can be fleeting if CONFIG_NO_HZ_FULL is enabled
From: Henrik Austad
By default, this is disabled (set to -1) and must be explicitly set in order
to have an effect. The CPU must be online.
If the specified CPU is part of the NO_HZ_FULL set, it is removed from
the set. When forced tick is either disabled or moved to another CPU, it
will try
From: Henrik Austad
This allows userspace to set a specific CPU as the only core able
to handle do_timer() updates via
cat sysctl kernel.forced_timer_cpu
/proc/sys/kernel/forced_timer_cpu
and for writing:
sysctl -w kernel.forced_timer_cpu=2
/bin/echo 2 > /proc/sys/ker
From: Henrik Austad
This allows userspace to set the forced CPU via sysfs in
/sys/kernel/timekeeping/forced_cpu.
CC: Thomas Gleixner
CC: Peter Zijlstra
CC: Frederic Weisbecker
CC: John Stultz
CC: Paul E. McKenney
Signed-off-by: Henrik Austad
---
kernel/time/timekeeping.c | 36
have
timer-interrupts disabled. As for NO_HZ_IDLE, timer CPU will change
often.
CC: Thomas Gleixner
CC: Peter Zijlstra
CC: Frederic Weisbecker
CC: John Stultz
Signed-off-by: Henrik Austad
---
kernel/time/tick-common.c | 12
kernel/time/tick-internal.h |1 +
2 files
Most of this is 'extras' needed in order to get sysfs working.
CC: Thomas Gleixner
CC: Peter Zijlstra
CC: Frederic Weisbecker
CC: John Stultz
Signed-off-by: Henrik Austad
---
kernel/time/timekeeping.c | 43 +++
1 file changed, 43 insertions
From: Henrik Austad
Hi!
This is a rework of the preiovus patch based on the feedback gathered
from the last round. I've split it up a bit, mostly to make it easier to
single out the parts that require more attention (#4 comes to mind).
Being able to read (and possible force a specific CPU
From: Henrik Austad haus...@cisco.com
Hi!
This is a rework of the preiovus patch based on the feedback gathered
from the last round. I've split it up a bit, mostly to make it easier to
single out the parts that require more attention (#4 comes to mind).
Being able to read (and possible force
Most of this is 'extras' needed in order to get sysfs working.
CC: Thomas Gleixner t...@linutronix.de
CC: Peter Zijlstra pet...@infradead.org
CC: Frederic Weisbecker fweis...@gmail.com
CC: John Stultz john.stu...@linaro.org
Signed-off-by: Henrik Austad haus...@cisco.com
---
kernel/time
have
timer-interrupts disabled. As for NO_HZ_IDLE, timer CPU will change
often.
CC: Thomas Gleixner t...@linutronix.de
CC: Peter Zijlstra pet...@infradead.org
CC: Frederic Weisbecker fweis...@gmail.com
CC: John Stultz john.stu...@linaro.org
Signed-off-by: Henrik Austad haus...@cisco.com
From: Henrik Austad haus...@cisco.com
This allows userspace to set the forced CPU via sysfs in
/sys/kernel/timekeeping/forced_cpu.
CC: Thomas Gleixner t...@linutronix.de
CC: Peter Zijlstra pet...@infradead.org
CC: Frederic Weisbecker fweis...@gmail.com
CC: John Stultz john.stu...@linaro.org
CC
From: Henrik Austad haus...@cisco.com
This allows userspace to see which CPU is currently responsible for
handling the do_timer update of the time machinery.
sysctl kernel.current_timer_cpu
/proc/sys/kernel/current_timer_cpu
Note that this value can be fleeting if CONFIG_NO_HZ_FULL
From: Henrik Austad haus...@cisco.com
By default, this is disabled (set to -1) and must be explicitly set in order
to have an effect. The CPU must be online.
If the specified CPU is part of the NO_HZ_FULL set, it is removed from
the set. When forced tick is either disabled or moved to another
From: Henrik Austad haus...@cisco.com
This allows userspace to set a specific CPU as the only core able
to handle do_timer() updates via
cat sysctl kernel.forced_timer_cpu
/proc/sys/kernel/forced_timer_cpu
and for writing:
sysctl -w kernel.forced_timer_cpu=2
/bin/echo 2
On Wed, Feb 19, 2014 at 05:42:07PM +0100, Thomas Gleixner wrote:
> On Wed, 19 Feb 2014, hen...@austad.us wrote:
> > From: Henrik Austad
> >
> > Looks like this got dropped by vger a few days ago, resending.
> >
> > This allows everybody in a system to read wh
On Wed, Feb 19, 2014 at 05:42:07PM +0100, Thomas Gleixner wrote:
On Wed, 19 Feb 2014, hen...@austad.us wrote:
From: Henrik Austad haus...@cisco.com
Looks like this got dropped by vger a few days ago, resending.
This allows everybody in a system to read which core is currently
On Mon, Feb 03, 2014 at 11:14:05AM +0100, Juri Lelli wrote:
> On 02/03/2014 10:53 AM, Henrik Austad wrote:
> > On Fri, Jan 31, 2014 at 05:43:27PM +0100, Juri Lelli wrote:
> >> Don't compare sysctl_sched_rt_runtime against sysctl_sched_rt_period if
> >> the former is equa
art of this test will always
be true.
Or have I suffered catastrophic monday-morning braindamage?
--
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catastrophic monday-morning braindamage?
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On Mon, Feb 03, 2014 at 11:14:05AM +0100, Juri Lelli wrote:
On 02/03/2014 10:53 AM, Henrik Austad wrote:
On Fri, Jan 31, 2014 at 05:43:27PM +0100, Juri Lelli wrote:
Don't compare sysctl_sched_rt_runtime against sysctl_sched_rt_period if
the former is equal to RUNTIME_INF, otherwise
On Fri, Jan 31, 2014 at 02:24:42PM -0800, Andrew Morton wrote:
> On Wed, 29 Jan 2014 22:24:11 -0600 Rob Landley wrote:
>
> > On 01/29/14 18:27, Henrik Austad wrote:
> > > Some of the 00-INDEX files are somewhat outdated and some folders does not
> > > contain
On Fri, Jan 31, 2014 at 02:24:42PM -0800, Andrew Morton wrote:
On Wed, 29 Jan 2014 22:24:11 -0600 Rob Landley r...@landley.net wrote:
On 01/29/14 18:27, Henrik Austad wrote:
Some of the 00-INDEX files are somewhat outdated and some folders does not
contain 00-INDEX at all. Only outdated
that?
Ahem, yes, but not anymore. Leftovers from my initial index-traverse.py
hack. Updated patch below.
henrik
>From 78882b49b0910079aa574781accc9426e215ac78 Mon Sep 17 00:00:00 2001
From: Henrik Austad
Date: Thu, 31 Oct 2013 14:19:10 +0100
Subject: [PATCH] Documentation cleanup, update
ler
CC: Mark Brown
CC: "H. Peter Anvin"
CC: Ingo Molnar
CC: Gleb Natapov
CC: Linus Torvalds
CC: Len Brown
CC: Andrew Morton
CC: James Bottomley
CC: Jean-Christophe Plagniol-Villard
Signed-off-by: Henrik Austad
---
Documentation/00-INDEX
Brown len.br...@intel.com
CC: Andrew Morton a...@linux-foundation.org
CC: James Bottomley jbottom...@parallels.com
CC: Jean-Christophe Plagniol-Villard plagn...@jcrosoft.com
Signed-off-by: Henrik Austad hen...@austad.us
---
Documentation/00-INDEX | 36
78882b49b0910079aa574781accc9426e215ac78 Mon Sep 17 00:00:00 2001
From: Henrik Austad hen...@austad.us
Date: Thu, 31 Oct 2013 14:19:10 +0100
Subject: [PATCH] Documentation cleanup, update 00-INDEX files in
Documentation/
Some of the 00-INDEX files are somewhat outdated and some folders does not
contain 00-INDEX at all. Only
On Mon, Jan 27, 2014 at 01:30:42PM +0100, Luca Abeni wrote:
> Hi Henrik,
>
> On 01/27/2014 12:53 PM, Henrik Austad wrote:
> [...]
> >>+ In more details, the CBS algorithm assigns scheduling deadlines to
> >>+ tasks in the following way:
> >>+
> >&g
some demonstrative code soon;
> + - (c)group based bandwidth management, and maybe scheduling;
> + - access control for non-root users (and related security concerns to
> +address), which is the best way to allow unprivileged use of the
> mechanisms
> +and how to prevent no
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Nice! /me is very happy
Reviewed-by: Henrik Austad hen...@austad.us
--
Henrik Austad
signature.asc
On Mon, Jan 27, 2014 at 01:30:42PM +0100, Luca Abeni wrote:
Hi Henrik,
On 01/27/2014 12:53 PM, Henrik Austad wrote:
[...]
+ In more details, the CBS algorithm assigns scheduling deadlines to
+ tasks in the following way:
+
+ - Each SCHED_DEADLINE task is characterised by the runtime
On Mon, Jan 20, 2014 at 12:24:42PM +0100, Henrik Austad wrote:
> On Mon, Jan 20, 2014 at 11:40:40AM +0100, Juri Lelli wrote:
> > From: Dario Faggioli
> >
> > Add in Documentation/scheduler/ some hints about the design
> > choices, the usage and the f
On Mon, Jan 20, 2014 at 02:39:29PM +0100, Luca Abeni wrote:
> Hi all,
>
> On 01/20/2014 02:16 PM, Henrik Austad wrote:
> [...]
> >>>>+ The typical -deadline task is composed of a computation phase (instance)
> >>>>+ which is activated on a
On Mon, Jan 20, 2014 at 02:39:29PM +0100, Luca Abeni wrote:
Hi all,
On 01/20/2014 02:16 PM, Henrik Austad wrote:
[...]
+ The typical -deadline task is composed of a computation phase (instance)
+ which is activated on a periodic or sporadic fashion. The expected
(maximum)
+ duration
On Mon, Jan 20, 2014 at 12:24:42PM +0100, Henrik Austad wrote:
On Mon, Jan 20, 2014 at 11:40:40AM +0100, Juri Lelli wrote:
From: Dario Faggioli raist...@linux.it
Add in Documentation/scheduler/ some hints about the design
choices, the usage and the future possible developments
On Mon, Jan 20, 2014 at 01:15:51PM +0100, Juri Lelli wrote:
> On 01/20/2014 12:24 PM, Henrik Austad wrote:
> > On Mon, Jan 20, 2014 at 11:40:40AM +0100, Juri Lelli wrote:
> >> From: Dario Faggioli
> >>
> >> Add in Documentation/scheduler/ some hints abou
> @@ -351,7 +351,8 @@ static void replenish_dl_entity(struct sched_dl_entity
> *dl_se,
> * disrupting the schedulability of the system. Otherwise, we should
> * refill the runtime and set the deadline a period in the future,
> * because keeping the current (absolute) deadline of the task would
> - * result in breaking guarantees promised to other tasks.
> + * result in breaking guarantees promised to other tasks (refer to
> + * Documentation/scheduler/sched-deadline.txt for more informations).
> *
> * This function returns true if:
> *
> --
> 1.7.9.5
>
> --
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> the body of a message to majord...@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
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Description: Digital signature
On Mon, Jan 20, 2014 at 01:15:51PM +0100, Juri Lelli wrote:
On 01/20/2014 12:24 PM, Henrik Austad wrote:
On Mon, Jan 20, 2014 at 11:40:40AM +0100, Juri Lelli wrote:
From: Dario Faggioli raist...@linux.it
Add in Documentation/scheduler/ some hints about the design
choices, the usage
://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
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uations
> requiring its use.
This was very useful, thanks! :)
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useful, thanks! :)
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Commit-ID: 854ff82ab085aed7509f6fb90f79ce6c41ee1fa4
Gitweb: http://git.kernel.org/tip/854ff82ab085aed7509f6fb90f79ce6c41ee1fa4
Author: Henrik Austad
AuthorDate: Wed, 27 Nov 2013 23:18:00 +0100
Committer: Ingo Molnar
CommitDate: Sat, 30 Nov 2013 14:08:28 +0100
Documentation/robust
Commit-ID: 854ff82ab085aed7509f6fb90f79ce6c41ee1fa4
Gitweb: http://git.kernel.org/tip/854ff82ab085aed7509f6fb90f79ce6c41ee1fa4
Author: Henrik Austad hen...@austad.us
AuthorDate: Wed, 27 Nov 2013 23:18:00 +0100
Committer: Ingo Molnar mi...@kernel.org
CommitDate: Sat, 30 Nov 2013 14:08:28
list :-)
This changes the numbered list 1,2,2,2 to the more intuitive 1,2,3,4.
Introduces in 2eec9ad9 (lightweight robust futexes: docs)
CC: Ingo Molnar
Signed-off-by: Henrik Austad
---
Documentation/robust-futex-ABI.txt |4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git
list :-)
This changes the numbered list 1,2,2,2 to the more intuitive 1,2,3,4.
Introduces in 2eec9ad9 (lightweight robust futexes: docs)
CC: Ingo Molnar mi...@elte.hu
Signed-off-by: Henrik Austad hen...@austad.us
---
Documentation/robust-futex-ABI.txt |4 ++--
1 file changed, 2 insertions
On Thu, Nov 14, 2013 at 11:09:03PM -0600, Rob Landley wrote:
> On 10/28/2013 08:05:11 AM, Henrik Austad wrote:
> >Hi Rob, Jiri
> >Hacking away at python shows me that of the 254 subfolders 57 has
> >outdated
> >00-INDEX, either with missing files, or files that has be
On Thu, Nov 14, 2013 at 11:09:03PM -0600, Rob Landley wrote:
On 10/28/2013 08:05:11 AM, Henrik Austad wrote:
Hi Rob, Jiri
Hacking away at python shows me that of the 254 subfolders 57 has
outdated
00-INDEX, either with missing files, or files that has been
removed. (see
list below)
I'm
: (0/4)
arm: (10/7)
fb: (3/3)
power: (1/2)
mmc: (4/0)
w1: (2/0)
w1/masters: (1/2)
w1/slaves: (0/1)
powerpc: (4/0)
x86: (0/8)
--
Henrik Austad
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: (0/4)
arm: (10/7)
fb: (3/3)
power: (1/2)
mmc: (4/0)
w1: (2/0)
w1/masters: (1/2)
w1/slaves: (0/1)
powerpc: (4/0)
x86: (0/8)
--
Henrik Austad
signature.asc
Description: Digital signature
From: Henrik Austad
- timers-howto was added by commit 0fcb8081 (Documentation: Add
timers/timers-howto.txt)
- NO_HZ was added by commit 0c87f9b5 (nohz_full: Add documentation.)
Cc: Patrick Pannuto
Cc: Paul E. McKenney
Cc: Jiri Kosina
Signed-off-by: Henrik Austad
---
Documentation/timers
From: Henrik Austad haus...@cisco.com
- timers-howto was added by commit 0fcb8081 (Documentation: Add
timers/timers-howto.txt)
- NO_HZ was added by commit 0c87f9b5 (nohz_full: Add documentation.)
Cc: Patrick Pannuto ppann...@codeaurora.org
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc
or user memory changes tracking")
61b0d760 ("zswap: add documentation")
27c6aec2 ("mm: frontswap: config and doc files")
Add the missing documentation-files with a short description to 00-INDEX
Signed-off-by: Henrik Austad
---
Documentation/vm/00-INDEX | 20 +++
documentation)
27c6aec2 (mm: frontswap: config and doc files)
Add the missing documentation-files with a short description to 00-INDEX
Signed-off-by: Henrik Austad hen...@austad.us
---
Documentation/vm/00-INDEX | 20
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git
From: Henrik Austad
The following files moved files out of Documentation/vm/
c6dd897f ("mm: move page-types.c from Documentation to tools/vm")
f0f57b2b ("move hugepage test examples to tools/testing/selftests/vm)
Remove these files from vm/00-INDEX.
The following commits add
From: Henrik Austad hen...@austad.us
The following files moved files out of Documentation/vm/
c6dd897f (mm: move page-types.c from Documentation to tools/vm)
f0f57b2b (move hugepage test examples to tools/testing/selftests/vm)
Remove these files from vm/00-INDEX.
The following commits added new
our question - if you get an excessive amount of
interrupts whilst in the middle of softirq processing, all you get is a set
of raised softirqs which will cause __do_softirq() to loop 10 times before
offloading the work to ksoftirqd.
--
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of softirq processing, all you get is a set
of raised softirqs which will cause __do_softirq() to loop 10 times before
offloading the work to ksoftirqd.
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0xfe407993fab8)
frame 3: 0xfff7004dc578 __ndelay+0x38/0x80 (sp 0xfe407993fae0)
However, in this case:
- the frequency is the same accross all cores
- we use the data read-only
- we do not scale the frequency
Which means that we can use the __raw_get_cpu_var instead.
Signed-off-by: Henrik
0xfe407993fab8)
frame 3: 0xfff7004dc578 __ndelay+0x38/0x80 (sp 0xfe407993fae0)
However, in this case:
- the frequency is the same accross all cores
- we use the data read-only
- we do not scale the frequency
Which means that we can use the __raw_get_cpu_var instead.
Signed-off-by: Henrik
0xfe407993fab8)
frame 3: 0xfff7004dc578 __ndelay+0x38/0x80 (sp 0xfe407993fae0)
However, in this case:
- the frequency is the same accross all cores
- we use the data read-only
- we do not scale the frequency
Which means that we can use the __raw_get_cpu_var instead.
Signed-off-by: Henrik
0xfe407993fab8)
frame 3: 0xfff7004dc578 __ndelay+0x38/0x80 (sp 0xfe407993fae0)
However, in this case:
- the frequency is the same accross all cores
- we use the data read-only
- we do not scale the frequency
Which means that we can use the __raw_get_cpu_var instead.
Signed-off-by: Henrik
lockups without being able to
preempt the thread at all.
Signed-off-by: Henrik Austad
---
arch/tile/lib/delay.c |2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/tile/lib/delay.c b/arch/tile/lib/delay.c
index cdacdd1..a53cdcd 100644
--- a/arch/tile/lib/delay.c
+++ b
lockups without being able to
preempt the thread at all.
Signed-off-by: Henrik Austad haus...@cisco.com
---
arch/tile/lib/delay.c |2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/tile/lib/delay.c b/arch/tile/lib/delay.c
index cdacdd1..a53cdcd 100644
--- a/arch/tile
201 - 279 of 279 matches
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