On Fri, Jul 05, 2013 at 08:51:13AM +0200, Ingo Molnar wrote:
* H. Peter Anvin h...@zytor.com wrote:
On 07/03/2013 07:49 PM, Linus Torvalds wrote:
[816f42bf] __schedule+0x94f/0x9c0
[816f487e] schedule_user+0x2e/0x70
[816f6de4] retint_careful+0x12/0x2e
2013/7/4 Peter Zijlstra pet...@infradead.org:
On Thu, Jul 04, 2013 at 01:34:13PM +0800, Alex Shi wrote:
If the tsc is marked as constant and nonstop, could we set it as system
clocksource when do tsc register? w/o checking it on clocksource_watchdog?
I'd not do that; the BIOS can still screw
On Fri, Jul 05, 2013 at 12:27:51PM -0700, Linus Torvalds wrote:
On Thu, Jul 4, 2013 at 11:51 PM, Ingo Molnar mi...@kernel.org wrote:
It would be nice to have a full-kernel-stack backtrace printout as an
option, which prints entries 'above' the current RSP.
One problem with that is that
On Fri, Sep 20, 2013 at 01:03:17PM +0200, Thomas Gleixner wrote:
On Thu, 19 Sep 2013, Linus Torvalds wrote:
On Thu, Sep 19, 2013 at 2:51 PM, Frederic Weisbecker fweis...@gmail.com
wrote:
It fixes stacks overruns reported by Benjamin Herrenschmidt:
http://lkml.kernel.org/r
On Fri, Sep 20, 2013 at 12:41:02PM +0200, Thomas Gleixner wrote:
On Thu, 19 Sep 2013, Christoph Lameter wrote:
On Thu, 19 Sep 2013, Thomas Gleixner wrote:
The vmstat accounting is not the only thing which we want to delegate
to dedicated core(s) for the full NOHZ mode.
So instead
On Fri, Sep 20, 2013 at 07:30:14PM +0200, Thomas Gleixner wrote:
On Fri, 20 Sep 2013, Frederic Weisbecker wrote:
Now just for clarity, what do we then do with inline sofirq
executions: on local_bh_enable() for example, or explicit calls to
do_softirq() other than irq exit? Should we keep
2013/9/20 Linus Torvalds torva...@linux-foundation.org:
On Fri, Sep 20, 2013 at 9:26 AM, Frederic Weisbecker fweis...@gmail.com
wrote:
Now just for clarity, what do we then do with inline sofirq executions: on
local_bh_enable()
for example, or explicit calls to do_softirq() other than irq
On Sun, Sep 22, 2013 at 07:45:01AM +1000, Benjamin Herrenschmidt wrote:
On Sat, 2013-09-21 at 13:58 -0500, Frederic Weisbecker wrote:
Now certainly what needs to be fixed then is archs that don't have
__ARCH_IRQ_EXIT_IRQS_DISABLED
or archs that have any other significant opportunity
On Fri, Sep 20, 2013 at 08:34:01AM -0700, Kees Cook wrote:
This reports the names of boot consoles as they're being disabled to
help identify which is which during cut-over. Helps answer the question
which boot console actually got activated? once the regular console
is running, mostly when
On Mon, Sep 23, 2013 at 02:40:34PM +1000, Benjamin Herrenschmidt wrote:
On Sun, 2013-09-22 at 07:45 +1000, Benjamin Herrenschmidt wrote:
What I *can* do that would help I suppose would be to switch to the irq
stack before irq_enter/exit which would at least mean that softirq would
run from
On Tue, Sep 24, 2013 at 02:42:57PM +1000, Benjamin Herrenschmidt wrote:
On Tue, 2013-09-24 at 04:44 +0200, Frederic Weisbecker wrote:
So the safest way to fix this is to unconditionally call do_softirq()
from irq_exit().
A performance penalty may come along but safety primes.
We should
On Wed, Sep 25, 2013 at 06:55:47AM +1000, Benjamin Herrenschmidt wrote:
On Tue, 2013-09-24 at 15:56 +0200, Frederic Weisbecker wrote:
On Tue, Sep 24, 2013 at 02:42:57PM +1000, Benjamin Herrenschmidt wrote:
On Tue, 2013-09-24 at 04:44 +0200, Frederic Weisbecker wrote:
So the safest way
debugging boot console failures.
Signed-off-by: Kees Cook keesc...@chromium.org
Acked-by: Frederic Weisbecker fweis...@gmail.com
Thanks!
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To unsubscribe from this list: send the line unsubscribe linux-kernel in
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significantly
the opportunities for task stack overflow dug by softirqs.
Longer term solutions may involve extending the hardirq stack coverage to
irq_exit(), etc...
Reported-by: Benjamin Herrenschmidt b...@kernel.crashing.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: sta
in __do_softirq()
* more comments
* introduction of a longer term solution via a new arch symbol for archs
to tell about irq_exit() stack coverage.
Thanks.
Frederic Weisbecker (7):
irq: Force hardirq exit's softirq processing on its own stack
irq: Consolidate do_softirq() arch overriden
step further and generalize that debug check to
any softirq processing.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc: Paul Mackerras pau...@au1.ibm.com
Cc: Ingo Molnar mi...@kernel.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Peter
there.
x86-32 is not concerned because it only runs the irq handler on
the irq stack.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc: Paul Mackerras pau...@au1.ibm.com
Cc: Ingo Molnar mi...@kernel.org
Cc: Thomas Gleixner t
() runs on the irq stack. That way
we can spare some stack switch on irq processing and all the cache
issues that come along.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc: Paul Mackerras pau...@au1.ibm.com
Cc: Ingo Molnar mi
For clarity, comment the various stack choices for softirqs
processing, whether we execute them from ksoftirqd or
local_irq_enable() calls.
Their use on irq_exit() is already commented.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc
Before processing softirqs on hardirq exit, we already
do the check for pending softirqs while hardirqs are
guaranteed to be disabled.
So we can take a shortcut and safely jump to the arch
specific implementation directly.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin
switch.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc: Paul Mackerras pau...@au1.ibm.com
Cc: Ingo Molnar mi...@kernel.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Peter Zijlstra pet...@infradead.org
Cc: H. Peter Anvin h...@zytor.com
Cc
On Wed, Sep 25, 2013 at 04:04:28PM -0700, Linus Torvalds wrote:
On Wed, Sep 25, 2013 at 9:18 AM, Frederic Weisbecker fweis...@gmail.com
wrote:
+#ifdef __ARCH_IRQ_EXIT_ON_IRQ_STACK
Please don't introduce anymore of these insane ad-hoc crazy architecture
macros.
Just make it a regular
to solve.
So lets adapt the irq exit's softirq stack on top of a new Kconfig symbol
that can be defined when irq_exit() runs on the irq stack. That way
we can spare some stack switch on irq processing and all the cache
issues that come along.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc
significantly
the opportunities for task stack overflow dug by softirqs.
Longer term solutions may involve extending the hardirq stack coverage to
irq_exit(), etc...
Reported-by: Benjamin Herrenschmidt b...@kernel.crashing.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: sta
of 06367d58f487a592de50e6e2327371c5e3b6188f
(Merge branch 'merge' of
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc)
And it can be pulled from:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
irq/core-v4
HEAD: 0362b2ff8d67913a8ffc5d757500129ead56b007
Frederic Weisbecker (8
step further and generalize that debug check to
any softirq processing.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc: Paul Mackerras pau...@au1.ibm.com
Cc: Ingo Molnar mi...@kernel.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Peter
Now that powerpc runs irq_exit() under the irq stack,
let the softirq core know about that so that we spare
the needless stack switch on irq exit's softirq processing.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc: Paul Mackerras pau
For clarity, comment the various stack choices for softirqs
processing, whether we execute them from ksoftirqd or
local_irq_enable() calls.
Their use on irq_exit() is already commented.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc
Before processing softirqs on hardirq exit, we already
do the check for pending softirqs while hardirqs are
guaranteed to be disabled.
So we can take a shortcut and safely jump to the arch
specific implementation directly.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin
there.
x86-32 is not concerned because it only runs the irq handler on
the irq stack.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc: Paul Mackerras pau...@au1.ibm.com
Cc: Ingo Molnar mi...@kernel.org
Cc: Thomas Gleixner t
switch.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Benjamin Herrenschmidt b...@kernel.crashing.org
Cc: Paul Mackerras pau...@au1.ibm.com
Cc: Ingo Molnar mi...@kernel.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Peter Zijlstra pet...@infradead.org
Cc: H. Peter Anvin h...@zytor.com
Cc
On Thu, Sep 26, 2013 at 09:43:38AM -0700, Linus Torvalds wrote:
On Thu, Sep 26, 2013 at 9:24 AM, Frederic Weisbecker fweis...@gmail.com
wrote:
* Turn __ARCH_IRQ_EXIT_ON_IRQ_STACK old ad-hoc style symbol to proper
Kconfig
(CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK)
* Activates it to powerpc
Ingo,
Please pull the context_tracking/fixes branch that can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
context_tracking/fixes
Thanks,
Frederic
---
Frederic Weisbecker (1):
arm: Fix build error with context tracking calls
On Thu, Sep 26, 2013 at 09:43:38AM -0700, Linus Torvalds wrote:
On Thu, Sep 26, 2013 at 9:24 AM, Frederic Weisbecker fweis...@gmail.com
wrote:
* Turn __ARCH_IRQ_EXIT_ON_IRQ_STACK old ad-hoc style symbol to proper
Kconfig
(CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK)
* Activates it to powerpc
Molnar mi...@kernel.org
Cc: Russell King r...@arm.linux.org.uk
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Arm Linux linux-arm-ker...@lists.infradead.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
init/Kconfig| 2 +-
kernel/time/Kconfig | 1 -
2 files changed, 1 insertion
Hi Kevin,
Your patchset was fine but I just did a second round. Namely I did the
following changes:
* Drop the 64 bits dependency after we settle the new dependency on
HAVE_VIRT_CPU_ACCOUNTING_GEN
and not before. This way we don't have a middle state that loose the dependency
in the middle of
.
Feature requested by Frederic Weisbecker.
Signed-off-by: Kevin Hilman khil...@linaro.org
Cc: Ingo Molnar mi...@kernel.org
Cc: Russell King r...@arm.linux.org.uk
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Arm Linux linux-arm-ker...@lists.infradead.org
Signed-off-by: Frederic Weisbecker
...@linaro.org
Cc: Ingo Molnar mi...@kernel.org
Cc: Russell King r...@arm.linux.org.uk
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Arm Linux linux-arm-ker...@lists.infradead.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
arch/arm/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff
/1380212686-25897-1-git-send-email-fweis...@gmail.com
I've added Linus ack and rebased to rc3.
Thanks,
Frederic
---
Frederic Weisbecker (1):
irq: Force hardirq exit's softirq processing on its own stack
kernel/softirq.c | 15 ---
1 file changed, 12 insertions(+), 3
/1380212686-25897-1-git-send-email-fweis...@gmail.com
with Linus and Benjamin's ack added and a rebase against rc3.
It also contains the regression fix (with the same commit id) from my
other pull request.
Thanks,
Frederic
---
Frederic Weisbecker (8):
irq: Force hardirq exit's softirq
On Mon, Sep 30, 2013 at 09:07:19AM -0700, Linus Torvalds wrote:
On Mon, Sep 30, 2013 at 7:55 AM, Frederic Weisbecker fweis...@gmail.com
wrote:
...
the chances for a stack overrun as reported in powerpc for example:
[ 1002.364577] do_IRQ: stack overflow: 1920
[ 1002.364653
On Wed, Jul 03, 2013 at 11:36:41AM -0700, Kevin Hilman wrote:
With the 64-bit requirement removed from virt CPU accounting,
allow ARM platforms to enable it.
Cc: Russell King rmk+ker...@arm.linux.org.uk
Signed-off-by: Kevin Hilman khil...@linaro.org
---
arch/arm/Kconfig | 1 +
1 file
that situation) and that's a bug. So we need to inherit the
64 bits dependency on NO_HZ_FULL to prevent that.
We can remove this dependency from NO_HZ_FULL, but only once we remove it
from VIRT_CPU_ACCOUNTING_GEN, not the other way around otherwise this
breaks bisection.
Cc: Frederic
On Wed, Jul 03, 2013 at 11:36:40AM -0700, Kevin Hilman wrote:
The 64-bit requirement can be removed after the conversion of the nsec
granularity cputime to work on !64_BIT, which was done in commit
8c23b80e (cputime_nsecs: use math64.h for nsec resolution conversion
helpers)
Cc: Frederic
a...@linux.intel.com
Cc: Frederic Weisbecker fweis...@gmail.com
Link: http://lkml.kernel.org/n/tip-0uskktybf0e7wrnoi5e9b...@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo a...@redhat.com
---
tools/perf/Documentation/perf-report.txt | 8 ++--
tools/perf/builtin-report.c
This is going to be used by the full dynticks subsystem
as a finer-grained information to know when to keep and
when to stop the tick.
Original-patch-by: Peter Zijlstra pet...@infradead.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Jiri Olsa jo...@redhat.com
Cc: Peter Zijlstra pet
When an event is migrated, move the event per-cpu
accounting accordingly so that branch stack and cgroup
events work correctly on the new CPU.
Original-patch-by: Peter Zijlstra pet...@infradead.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Jiri Olsa jo...@redhat.com
Cc: Peter
concurrently with the full dynticks feature.
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Jiri Olsa jo...@redhat.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Namhyung Kim namhy...@kernel.org
Cc: Ingo Molnar mi...@kernel.org
Cc: Arnaldo Carvalho de Melo a...@redhat.com
Cc: Stephane Eranian
events is handled from a seperate hrtimer.
The tick can be shutdown the rest of the time.
Original-patch-by: Peter Zijlstra pet...@infradead.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Jiri Olsa jo...@redhat.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Namhyung Kim namhy
-by: Frederic Weisbecker fweis...@gmail.com
Cc: Jiri Olsa jo...@redhat.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Namhyung Kim namhy...@kernel.org
Cc: Ingo Molnar mi...@kernel.org
Cc: Arnaldo Carvalho de Melo a...@redhat.com
Cc: Stephane Eranian eran...@google.com
---
kernel/events/core.c | 12
Gather all the event accounting code to a single place,
once all the prerequisites are completed. This simplifies
the refcounting.
Original-patch-by: Peter Zijlstra pet...@infradead.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Jiri Olsa jo...@redhat.com
Cc: Peter Zijlstra pet
if case of failure, not by the caller.
So lets clean this up by cancelling the refcount from
get_callchain_buffer() in case of failure. And correctly free
the event accordingly in perf_event_alloc().
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Jiri Olsa jo...@redhat.com
Cc: Peter Zijlstra
Split the per-cpu accounting part of the event
accounting code.
This way we can use the per-cpu handling seperately.
This is going to be used by to fix the event migration
code accounting.
Original-patch-by: Peter Zijlstra pet...@infradead.org
Signed-off-by: Frederic Weisbecker fweis
that distros want to enable both...
You can fetch from:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
perf/nohz
Thanks,
Frederic
---
Frederic Weisbecker (8):
perf: Fix branch stack refcount leak on callchain init failure
perf: Sanitize
On Tue, Jul 23, 2013 at 08:33:31AM -0400, Don Zickus wrote:
On Tue, Jul 23, 2013 at 02:31:06AM +0200, Frederic Weisbecker wrote:
A perf event can be used without forcing the tick to
stay alive if it doesn't use a frequency but a sample
period and if it doesn't throttle (raise storm
On Thu, Apr 18, 2013 at 01:32:09PM +0200, Peter Zijlstra wrote:
On Mon, 2013-04-15 at 16:30 -0700, Andrew Morton wrote:
I think this will break the build if CONFIG_PERF_EVENTS=n and
CONFIG_LOCKUP_DETECTOR=y. I was able to create such a config for
powerpc. If I'm reading it correctly,
On Thu, Jul 18, 2013 at 10:06:25PM -0700, Paul E. McKenney wrote:
Lets summarize the last sequence, the following happens ordered by time:
CPU 0 CPU 1
cmpxchg(full_sysidle_state,
RCU_SYSIDLE_SHORT,
RCU_SYSIDLE_LONG);
Galbraith efa...@gmx.de
Cc: Kevin Hilman khil...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/time/tick-sched.c |3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index e80183f..1102534 100644
Gleixner t...@linutronix.de
Cc: Peter Zijlstra pet...@infradead.org
Cc: Borislav Petkov b...@alien8.de
Cc: Li Zhong zh...@linux.vnet.ibm.com
Cc: Mike Galbraith efa...@gmx.de
Cc: Kevin Hilman khil...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/time/tick-sched.c |2 --
1
Ingo,
Please pull the timers/urgent branch that can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
timers/urgent
Just one thing you need to know: you reported me that the warning was
too much to tell the user that he can't use full dynticks due to
On Wed, May 07, 2014 at 05:17:35PM +0200, Peter Zijlstra wrote:
On Mon, May 05, 2014 at 05:34:08PM +0200, Frederic Weisbecker wrote:
On Mon, May 05, 2014 at 05:12:28PM +0200, Peter Zijlstra wrote:
Note the current ordering:
cmpxchg(qsd-pending, 0, 1) get ipi
On Wed, May 07, 2014 at 05:37:36PM +0200, Peter Zijlstra wrote:
On Wed, May 07, 2014 at 05:29:24PM +0200, Frederic Weisbecker wrote:
On Wed, May 07, 2014 at 05:17:35PM +0200, Peter Zijlstra wrote:
On Mon, May 05, 2014 at 05:34:08PM +0200, Frederic Weisbecker wrote:
On Mon, May 05, 2014
...@cn.fujitsu.com
Cc: Mike Galbraith bitbuc...@online.de
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Tejun Heo t...@kernel.org
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/workqueue.c | 65
Cc: Tejun Heo t...@kernel.org
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/workqueue.c | 626 ++---
1 file changed, 313 insertions(+), 313 deletions(-)
diff --git a/kernel/workqueue.c b
Heo t...@kernel.org
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/workqueue.c | 8
1 file changed, 8 insertions(+)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 5978cee..504cf0a 100644
--- a/kernel/workqueue.c
+++ b
...@linux.com
Cc: Kevin Hilman khil...@linaro.org
Cc: Lai Jiangshan la...@cn.fujitsu.com
Cc: Mike Galbraith bitbuc...@online.de
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Tejun Heo t...@kernel.org
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Lai Jiangshan la...@cn.fujitsu.com
Cc: Mike Galbraith bitbuc...@online.de
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Tejun Heo t...@kernel.org
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/workqueue.c | 69
paul...@linux.vnet.ibm.com
Cc: Tejun Heo t...@kernel.org
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/workqueue.c | 77 +++---
1 file changed, 44 insertions(+), 33 deletions(-)
diff --git
/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
core/workqueue-v4
---
Frederic Weisbecker (5):
workqueue: Reorder sysfs code
workqueue: Create low-level unbound workqueues cpumask
workqueue: Split apply attrs code from its locking
workqueue: Allow modifying low
On Wed, May 07, 2014 at 09:07:14PM +0200, Ingo Molnar wrote:
* Peter Zijlstra pet...@infradead.org wrote:
On Wed, May 07, 2014 at 06:05:08PM +0200, Frederic Weisbecker wrote:
So we can as well zap these commits and replace them with the
irq_work_on()
conversion (still preparing
On Sat, May 10, 2014 at 12:57:15AM +0200, Thomas Gleixner wrote:
On Fri, 9 May 2014, Christoph Lameter wrote:
On Fri, 9 May 2014, Thomas Gleixner wrote:
I understand why you want to get this done by a housekeeper, I just
did not understand why we need this whole move it around business is
On Fri, May 09, 2014 at 04:47:45PM -0700, Paul E. McKenney wrote:
On Sat, May 10, 2014 at 12:57:15AM +0200, Thomas Gleixner wrote:
If someone decides to make tick_do_timer_cpu non-constant in NO_HZ_FULL
CPUs, they will break unless/until I make RCU deal with that sort
of thing, at least for
On Sat, May 10, 2014 at 02:31:28PM +0200, Thomas Gleixner wrote:
On Sat, 10 May 2014, Frederic Weisbecker wrote:
But I still have the plan to make the timekeeper use the full sysidle
facility in order to adaptively get to dynticks idle.
Reminder for others: in NO_HZ_FULL, the timekeeper
On Sat, May 10, 2014 at 06:17:08PM -0700, Paul E. McKenney wrote:
On Sat, May 10, 2014 at 03:14:25PM +0200, Frederic Weisbecker wrote:
On Sat, May 10, 2014 at 02:31:28PM +0200, Thomas Gleixner wrote:
On Sat, 10 May 2014, Frederic Weisbecker wrote:
But I still have the plan to make
...@linux.vnet.ibm.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
include/linux/irq_work.h | 2 ++
kernel/irq_work.c| 29 +++--
2 files
...@linaro.org
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/sched/core.c | 9 +
kernel/sched/sched.h | 10
Hi,
So this version gives up with smp_queue_function_single() and extends
irq work to support remote queuing. As suggested by Peterz.
Comments?
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
timers/nohz-irq-work
Thanks,
Frederic
---
Frederic
Gleixner t...@linutronix.de
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
include/linux/tick.h | 9 -
kernel/sched/core.c | 5 +
kernel/sched/sched.h | 2 +-
kernel/time/Kconfig | 2 ++
kernel/time/tick-sched.c
viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
arch/Kconfig | 12
arch/alpha/kernel/time.c | 3 ++-
arch/arm/Kconfig | 1 +
arch/arm/kernel/smp.c | 4 ++--
arch/powerpc/kernel/time.c | 3 ++-
arch/sparc/kernel/pcr.c
: Ingo Molnar mi...@kernel.org
Cc: Kevin Hilman khil...@linaro.org
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
include/linux/tick.h | 9 -
kernel/time/tick-sched.c | 10 ++
2 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/include/linux/tick.h b/include/linux/tick.h
index
E. McKenney paul...@linux.vnet.ibm.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/irq_work.c | 53 -
1
mi...@kernel.org
Cc: Kevin Hilman khil...@linaro.org
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/sched/core.c
Molnar mi...@kernel.org
Cc: Kevin Hilman khil...@linaro.org
Cc: Paul E. McKenney paul...@linux.vnet.ibm.com
Cc: Peter Zijlstra pet...@infradead.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/sched
Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
include/linux/irq_work.h | 5 +
kernel/irq_work.c| 25 -
kernel/smp.c | 9 +
3 files changed, 38 insertions(+), 1 deletion(-)
diff --git a/include/linux
viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/sched/core.c | 8 +++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d9d8ece..03dc7e9 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
() on CONFIG_SMP, fixes some broken builds
* Convert full nohz timer list kick
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
timers/nohz-irq-work-v6
Thanks,
Frederic
---
Frederic Weisbecker (6):
irq_work: Split raised and lazy lists
irq_work
On Tue, Jun 10, 2014 at 05:48:39PM +0200, Peter Zijlstra wrote:
On Tue, Jun 10, 2014 at 05:15:03PM +0200, Frederic Weisbecker wrote:
So this set happens to have more changes than expected because I
found out that the timer list full nohz kick also relies on the scheduler
IPI. So I had
On Tue, Jun 10, 2014 at 05:48:13PM +0200, Peter Zijlstra wrote:
On Tue, Jun 10, 2014 at 05:15:09PM +0200, Frederic Weisbecker wrote:
+ /*
+ * More than one running task need preemption.
+ * nr_running update is assumed to be visible
+ * after IPI is sent from wakers
On Thu, May 29, 2014 at 10:09:48AM +0200, Jiri Kosina wrote:
On Thu, 29 May 2014, Frederic Weisbecker wrote:
I am rather surprised that this patchset hasn't received a single review
comment for 3 weeks.
Let me point out that the issues Petr is talking about in the cover
letter
On Fri, May 30, 2014 at 10:13:28AM +0200, Jan Kara wrote:
On Thu 29-05-14 02:09:11, Frederic Weisbecker wrote:
On Thu, May 29, 2014 at 12:02:30AM +0200, Jiri Kosina wrote:
On Fri, 9 May 2014, Petr Mladek wrote:
printk() cannot be used safely in NMI context because it uses internal
Thomas,
Viresh has spotted and fixed an interesting issue. When a timer list
is enqueued or updated on a (idle or full) dynticks target, we kick it
with an IPI.
At least that's what we do on add_timer_on() but the mod_timer*() family
doesn't handle that. I think that's because we had assumptions
the callers know the CPU
number of a timer's base. So lets store it in the struct tvec_base to
resolve the CPU without much overhead. It is set once for good at every
CPU's first boot.
Signed-off-by: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel
that it is well handled for all sort of timer
enqueue. Even timer migration is concerned so that a full dynticks target
is correctly kicked as needed when timers are migrating to it.
Signed-off-by: Viresh Kumar viresh.ku...@linaro.org
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
---
kernel/timer.c
kthread only when nohz full is actually used
(ie: when the nohz_full= parameter is filled or CONFIG_NO_HZ_FULL_ALL=y)
Signed-off-by: Frederic Weisbecker fweis...@gmail.com
Cc: Josh Triplett j...@joshtriplett.org
Cc: Steven Rostedt rost...@goodmis.org
Cc: Mathieu Desnoyers mathieu.desnoy
On Thu, Jun 12, 2014 at 06:24:32PM -0700, Paul E. McKenney wrote:
On Fri, Jun 13, 2014 at 02:16:59AM +0200, Frederic Weisbecker wrote:
CONFIG_NO_HZ_FULL may be enabled widely on distros nowadays but actual
users should be a tiny minority, if actually any.
Also there is a risk
On Thu, Jun 12, 2014 at 06:35:15PM -0700, Paul E. McKenney wrote:
On Thu, Jun 12, 2014 at 06:24:32PM -0700, Paul E. McKenney wrote:
On Fri, Jun 13, 2014 at 02:16:59AM +0200, Frederic Weisbecker wrote:
CONFIG_NO_HZ_FULL may be enabled widely on distros nowadays but actual
users should
On Thu, Jun 12, 2014 at 07:05:54PM -0700, Paul E. McKenney wrote:
On Thu, Jun 12, 2014 at 06:24:32PM -0700, Paul E. McKenney wrote:
On Fri, Jun 13, 2014 at 02:16:59AM +0200, Frederic Weisbecker wrote:
CONFIG_NO_HZ_FULL may be enabled widely on distros nowadays but actual
users should
On Fri, Jun 13, 2014 at 08:52:33AM -0700, Paul E. McKenney wrote:
On Fri, Jun 13, 2014 at 02:47:16PM +0200, Frederic Weisbecker wrote:
On Thu, Jun 12, 2014 at 06:35:15PM -0700, Paul E. McKenney wrote:
On Thu, Jun 12, 2014 at 06:24:32PM -0700, Paul E. McKenney wrote:
On Fri, Jun 13, 2014
On Fri, Jun 13, 2014 at 08:55:48AM -0700, Paul E. McKenney wrote:
On Fri, Jun 13, 2014 at 02:55:45PM +0200, Frederic Weisbecker wrote:
On Thu, Jun 12, 2014 at 07:05:54PM -0700, Paul E. McKenney wrote:
On Thu, Jun 12, 2014 at 06:24:32PM -0700, Paul E. McKenney wrote:
On Fri, Jun 13, 2014
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