From: "Rafael J. Wysocki" <rjw@rjwysocki.net> To: Chris Metcalf <cmetcalf@mellanox.com> Cc: Peter Zijlstra <peterz@infradead.org>, Russell King <linux@arm.linux.org.uk>, Thomas Gleixner <tglx@linutronix.de>, Aaron Tomlin <atomlin@redhat.com>, Ingo Molnar <mingo@redhat.com>, Andrew Morton <akpm@osdl.org>, Daniel Thompson <daniel.thompson@linaro.org>, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: [PATCH v3 4/4] nmi_backtrace: generate one-line reports for idle cpus Date: Tue, 22 Mar 2016 23:31:11 +0100 [thread overview] Message-ID: <54039485.X1biSGXPBa@vostro.rjw.lan> (raw) In-Reply-To: <1458667179-19630-5-git-send-email-cmetcalf@mellanox.com> On Tuesday, March 22, 2016 01:19:39 PM Chris Metcalf wrote: > When doing an nmi backtrace of many cores, most of which are idle, > the output is a little overwhelming and very uninformative. Suppress > messages for cpus that are idling when they are interrupted and just > emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN". > > We do this by grouping all the cpuidle code together into a new > .cpuidle.text section, and then checking the address of the > interrupted PC to see if it lies within that section. > > This commit suitably tags x86, arm64, and tile idle routines, > and only adds in the minimal framework for other architectures. > > Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> > --- [cut] > diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c > index cd4510a63375..924554f920fb 100644 > --- a/drivers/idle/intel_idle.c > +++ b/drivers/idle/intel_idle.c > @@ -725,8 +725,8 @@ static struct cpuidle_state avn_cstates[] = { > * > * Must be called under local_irq_disable(). > */ > -static int intel_idle(struct cpuidle_device *dev, > - struct cpuidle_driver *drv, int index) > +static __cpuidle int intel_idle(struct cpuidle_device *dev, > + struct cpuidle_driver *drv, int index) > { > unsigned long ecx = 1; /* break on interrupt flag */ > struct cpuidle_state *state = &drv->states[index]; Well, what about intel_idle_freeze()? Or do we not care? And analogous stuff in processor_idle.c for that matter? acpi_idle_enter()/acpi_idle_enter_freeze() plus stuff called by those? Thanks, Rafael
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From: rjw@rjwysocki.net (Rafael J. Wysocki) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 4/4] nmi_backtrace: generate one-line reports for idle cpus Date: Tue, 22 Mar 2016 23:31:11 +0100 [thread overview] Message-ID: <54039485.X1biSGXPBa@vostro.rjw.lan> (raw) In-Reply-To: <1458667179-19630-5-git-send-email-cmetcalf@mellanox.com> On Tuesday, March 22, 2016 01:19:39 PM Chris Metcalf wrote: > When doing an nmi backtrace of many cores, most of which are idle, > the output is a little overwhelming and very uninformative. Suppress > messages for cpus that are idling when they are interrupted and just > emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN". > > We do this by grouping all the cpuidle code together into a new > .cpuidle.text section, and then checking the address of the > interrupted PC to see if it lies within that section. > > This commit suitably tags x86, arm64, and tile idle routines, > and only adds in the minimal framework for other architectures. > > Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> > --- [cut] > diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c > index cd4510a63375..924554f920fb 100644 > --- a/drivers/idle/intel_idle.c > +++ b/drivers/idle/intel_idle.c > @@ -725,8 +725,8 @@ static struct cpuidle_state avn_cstates[] = { > * > * Must be called under local_irq_disable(). > */ > -static int intel_idle(struct cpuidle_device *dev, > - struct cpuidle_driver *drv, int index) > +static __cpuidle int intel_idle(struct cpuidle_device *dev, > + struct cpuidle_driver *drv, int index) > { > unsigned long ecx = 1; /* break on interrupt flag */ > struct cpuidle_state *state = &drv->states[index]; Well, what about intel_idle_freeze()? Or do we not care? And analogous stuff in processor_idle.c for that matter? acpi_idle_enter()/acpi_idle_enter_freeze() plus stuff called by those? Thanks, Rafael
next prev parent reply other threads:[~2016-03-22 22:29 UTC|newest] Thread overview: 121+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-02-29 21:40 [PATCH 0/4] improvements to the nmi_backtrace code Chris Metcalf 2016-02-29 21:40 ` Chris Metcalf 2016-02-29 21:40 ` [PATCH 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace() methods Chris Metcalf 2016-02-29 21:40 ` Chris Metcalf 2016-02-29 21:40 ` [PATCH 2/4] nmi_backtrace: generate one-line reports for idle cpus Chris Metcalf 2016-03-01 14:23 ` Daniel Thompson 2016-03-01 16:01 ` Chris Metcalf 2016-03-07 8:26 ` Daniel Thompson 2016-03-07 17:05 ` Chris Metcalf 2016-03-07 9:48 ` Peter Zijlstra 2016-03-07 17:38 ` Chris Metcalf 2016-03-07 20:43 ` Peter Zijlstra 2016-03-16 17:02 ` [PATCH v2 0/4] improvements to the nmi_backtrace code Chris Metcalf 2016-03-16 17:02 ` Chris Metcalf 2016-03-16 17:02 ` Chris Metcalf 2016-03-16 17:02 ` Chris Metcalf 2016-03-16 17:02 ` [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace() methods Chris Metcalf 2016-03-16 17:02 ` Chris Metcalf 2016-03-17 19:36 ` Peter Zijlstra 2016-03-17 19:36 ` Peter Zijlstra 2016-03-17 22:31 ` Chris Metcalf 2016-03-17 22:31 ` Chris Metcalf 2016-03-17 22:38 ` Peter Zijlstra 2016-03-17 22:38 ` Peter Zijlstra 2016-03-17 22:41 ` Chris Metcalf 2016-03-17 22:41 ` Chris Metcalf 2016-03-17 23:14 ` Peter Zijlstra 2016-03-17 23:14 ` Peter Zijlstra 2016-03-17 22:55 ` Paul E. McKenney 2016-03-17 22:55 ` Paul E. McKenney 2016-03-17 23:09 ` Peter Zijlstra 2016-03-17 23:09 ` Peter Zijlstra 2016-03-17 23:11 ` Peter Zijlstra 2016-03-17 23:11 ` Peter Zijlstra 2016-03-18 0:28 ` Paul E. McKenney 2016-03-18 0:28 ` Paul E. McKenney 2016-03-18 0:17 ` Chris Metcalf 2016-03-18 0:17 ` Chris Metcalf 2016-03-18 0:33 ` Paul E. McKenney 2016-03-18 0:33 ` Paul E. McKenney 2016-03-18 9:40 ` Daniel Thompson 2016-03-18 9:40 ` Daniel Thompson 2016-03-18 23:54 ` Paul E. McKenney 2016-03-18 23:54 ` Paul E. McKenney 2016-03-16 17:02 ` [PATCH v2 2/4] nmi_backtrace: do a local dump_stack() instead of a self-NMI Chris Metcalf 2016-03-16 17:02 ` Chris Metcalf 2016-03-16 17:02 ` [PATCH v2 3/4] arch/tile: adopt the new nmi_backtrace framework Chris Metcalf 2016-03-16 17:02 ` [PATCH v2 4/4] nmi_backtrace: generate one-line reports for idle cpus Chris Metcalf 2016-03-16 17:02 ` Chris Metcalf 2016-03-16 17:02 ` Chris Metcalf 2016-03-16 18:46 ` kbuild test robot 2016-03-16 18:46 ` kbuild test robot 2016-03-16 18:46 ` kbuild test robot 2016-03-16 18:46 ` kbuild test robot 2016-03-21 15:38 ` Peter Zijlstra 2016-03-21 15:38 ` Peter Zijlstra 2016-03-21 15:38 ` Peter Zijlstra 2016-03-21 15:46 ` Chris Metcalf 2016-03-21 15:46 ` Chris Metcalf 2016-03-21 15:46 ` Chris Metcalf 2016-03-21 15:46 ` Chris Metcalf 2016-03-21 15:42 ` Peter Zijlstra 2016-03-21 15:42 ` Peter Zijlstra 2016-03-21 16:15 ` Chris Metcalf 2016-03-21 16:15 ` Chris Metcalf 2016-03-21 16:15 ` Chris Metcalf 2016-03-21 16:32 ` Peter Zijlstra 2016-03-21 16:32 ` Peter Zijlstra 2016-03-21 17:12 ` Chris Metcalf 2016-03-21 17:12 ` Chris Metcalf 2016-03-21 17:12 ` Chris Metcalf 2016-03-21 17:12 ` Chris Metcalf 2016-03-21 17:17 ` Peter Zijlstra 2016-03-21 17:17 ` Peter Zijlstra 2016-03-21 16:48 ` Peter Zijlstra 2016-03-21 16:48 ` Peter Zijlstra 2016-03-21 21:49 ` Peter Zijlstra 2016-03-21 21:49 ` Peter Zijlstra 2016-03-22 17:19 ` [PATCH v3 0/4] improvements to the nmi_backtrace code Chris Metcalf 2016-03-22 17:19 ` Chris Metcalf 2016-03-22 17:19 ` Chris Metcalf 2016-03-22 17:19 ` Chris Metcalf 2016-03-22 17:19 ` [PATCH v3 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace() methods Chris Metcalf 2016-03-22 17:19 ` Chris Metcalf 2016-03-22 17:19 ` [PATCH v3 2/4] nmi_backtrace: do a local dump_stack() instead of a self-NMI Chris Metcalf 2016-03-22 17:19 ` Chris Metcalf 2016-03-22 17:19 ` [PATCH v3 3/4] arch/tile: adopt the new nmi_backtrace framework Chris Metcalf 2016-03-22 17:19 ` [PATCH v3 4/4] nmi_backtrace: generate one-line reports for idle cpus Chris Metcalf 2016-03-22 17:19 ` Chris Metcalf 2016-03-22 17:19 ` Chris Metcalf 2016-03-22 17:30 ` Peter Zijlstra 2016-03-22 17:30 ` Peter Zijlstra 2016-03-22 22:28 ` Rafael J. Wysocki 2016-03-22 22:28 ` Rafael J. Wysocki 2016-03-22 22:31 ` Rafael J. Wysocki [this message] 2016-03-22 22:31 ` Rafael J. Wysocki 2016-03-22 22:45 ` Peter Zijlstra 2016-03-22 22:45 ` Peter Zijlstra 2016-03-23 0:50 ` Rafael J. Wysocki 2016-03-23 0:50 ` Rafael J. Wysocki 2016-03-23 7:53 ` Peter Zijlstra 2016-03-23 7:53 ` Peter Zijlstra 2016-03-30 17:16 ` [PATCH v4 0/4] improvements to the nmi_backtrace code Chris Metcalf 2016-03-30 17:16 ` Chris Metcalf 2016-03-30 17:16 ` Chris Metcalf 2016-03-30 17:16 ` Chris Metcalf 2016-03-30 17:16 ` [PATCH v4 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace() methods Chris Metcalf 2016-03-30 17:16 ` Chris Metcalf 2016-03-30 17:16 ` [PATCH v4 2/4] nmi_backtrace: do a local dump_stack() instead of a self-NMI Chris Metcalf 2016-03-30 17:16 ` Chris Metcalf 2016-03-30 17:16 ` [PATCH v4 3/4] arch/tile: adopt the new nmi_backtrace framework Chris Metcalf 2016-03-30 17:16 ` [PATCH v4 4/4] nmi_backtrace: generate one-line reports for idle cpus Chris Metcalf 2016-03-30 17:16 ` Chris Metcalf 2016-03-30 17:16 ` Chris Metcalf 2016-02-29 21:40 ` [PATCH 3/4] nmi_backtrace: do a local dump_stack() instead of a self-NMI Chris Metcalf 2016-02-29 21:40 ` Chris Metcalf 2016-02-29 21:40 ` [PATCH 4/4] arch/tile: adopt the new nmi_backtrace framework Chris Metcalf 2016-03-01 0:49 ` [PATCH 0/4] improvements to the nmi_backtrace code Andrew Morton 2016-03-01 0:49 ` Andrew Morton 2016-03-01 10:01 ` Petr Mladek 2016-03-01 10:01 ` Petr Mladek
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