From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Andi Kleen <andi.kleen@intel.com>,
Ashok Raj <ashok.raj@intel.com>, Borislav Petkov <bp@suse.de>,
Tony Luck <tony.luck@intel.com>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
x86@kernel.org, sparclinux@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Jacob Pan <jacob.jun.pan@intel.com>,
Don Zickus <dzickus@redhat.com>,
Nicholas Piggin <npiggin@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Frederic Weisbecker <frederic@kernel.org>,
Babu Moger <babu.moger@oracle.com>,
"David S. Miller" <davem@davemloft.net>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>, Mathieu Desnoyers <mat>
Subject: Re: [RFC PATCH 14/23] watchdog/hardlockup: Decouple the hardlockup detector from perf
Date: Wed, 13 Jun 2018 18:19:01 -0700 [thread overview]
Message-ID: <20180614011901.GA22652@voyager> (raw)
In-Reply-To: <20180613084324.GU12258@hirez.programming.kicks-ass.net>
On Wed, Jun 13, 2018 at 10:43:24AM +0200, Peter Zijlstra wrote:
> On Tue, Jun 12, 2018 at 05:57:34PM -0700, Ricardo Neri wrote:
> > The current default implementation of the hardlockup detector assumes that
> > it is implemented using perf events.
>
> The sparc and powerpc things are very much not using perf.
Isn't it true that the current hardlockup detector
(under kernel/watchdog_hld.c) is based on perf? As far as I understand,
this hardlockup detector is constructed using perf events for architectures
that don't provide an NMI watchdog. Perhaps I can be more specific and say
that this synthetized detector is based on perf.
On a side note, I saw that powerpc might use a perf-based hardlockup
detector if it has perf events [1].
Please let me know if my understanding is not correct.
Thanks and BR,
Ricardo
[1]. https://elixir.bootlin.com/linux/v4.17/source/arch/powerpc/Kconfig#L218
WARNING: multiple messages have this Message-ID (diff)
From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Andi Kleen <andi.kleen@intel.com>,
Ashok Raj <ashok.raj@intel.com>, Borislav Petkov <bp@suse.de>,
Tony Luck <tony.luck@intel.com>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
x86@kernel.org, sparclinux@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Jacob Pan <jacob.jun.pan@intel.com>,
Don Zickus <dzickus@redhat.com>,
Nicholas Piggin <npiggin@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Frederic Weisbecker <frederic@kernel.org>,
Babu Moger <babu.moger@oracle.com>,
"David S. Miller" <davem@davemloft.net>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Philippe Ombredanne <pombredanne@nexb.com>,
Colin Ian King <colin.king@canonical.com>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
iommu@lists.linux-foundation.org
Subject: Re: [RFC PATCH 14/23] watchdog/hardlockup: Decouple the hardlockup detector from perf
Date: Wed, 13 Jun 2018 18:19:01 -0700 [thread overview]
Message-ID: <20180614011901.GA22652@voyager> (raw)
In-Reply-To: <20180613084324.GU12258@hirez.programming.kicks-ass.net>
On Wed, Jun 13, 2018 at 10:43:24AM +0200, Peter Zijlstra wrote:
> On Tue, Jun 12, 2018 at 05:57:34PM -0700, Ricardo Neri wrote:
> > The current default implementation of the hardlockup detector assumes that
> > it is implemented using perf events.
>
> The sparc and powerpc things are very much not using perf.
Isn't it true that the current hardlockup detector
(under kernel/watchdog_hld.c) is based on perf? As far as I understand,
this hardlockup detector is constructed using perf events for architectures
that don't provide an NMI watchdog. Perhaps I can be more specific and say
that this synthetized detector is based on perf.
On a side note, I saw that powerpc might use a perf-based hardlockup
detector if it has perf events [1].
Please let me know if my understanding is not correct.
Thanks and BR,
Ricardo
[1]. https://elixir.bootlin.com/linux/v4.17/source/arch/powerpc/Kconfig#L218
WARNING: multiple messages have this Message-ID (diff)
From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Andi Kleen <andi.kleen@intel.com>,
Ashok Raj <ashok.raj@intel.com>, Borislav Petkov <bp@suse.de>,
Tony Luck <tony.luck@intel.com>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
x86@kernel.org, sparclinux@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Jacob Pan <jacob.jun.pan@intel.com>,
Don Zickus <dzickus@redhat.com>,
Nicholas Piggin <npiggin@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Frederic Weisbecker <frederic@kernel.org>,
Babu Moger <babu.moger@oracle.com>,
"David S. Miller" <davem@davemloft.net>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>, Mathieu Desnoyers <mat>
Subject: Re: [RFC PATCH 14/23] watchdog/hardlockup: Decouple the hardlockup detector from perf
Date: Thu, 14 Jun 2018 01:19:01 +0000 [thread overview]
Message-ID: <20180614011901.GA22652@voyager> (raw)
In-Reply-To: <20180613084324.GU12258@hirez.programming.kicks-ass.net>
On Wed, Jun 13, 2018 at 10:43:24AM +0200, Peter Zijlstra wrote:
> On Tue, Jun 12, 2018 at 05:57:34PM -0700, Ricardo Neri wrote:
> > The current default implementation of the hardlockup detector assumes that
> > it is implemented using perf events.
>
> The sparc and powerpc things are very much not using perf.
Isn't it true that the current hardlockup detector
(under kernel/watchdog_hld.c) is based on perf? As far as I understand,
this hardlockup detector is constructed using perf events for architectures
that don't provide an NMI watchdog. Perhaps I can be more specific and say
that this synthetized detector is based on perf.
On a side note, I saw that powerpc might use a perf-based hardlockup
detector if it has perf events [1].
Please let me know if my understanding is not correct.
Thanks and BR,
Ricardo
[1]. https://elixir.bootlin.com/linux/v4.17/source/arch/powerpc/Kconfig#L218
next prev parent reply other threads:[~2018-06-14 1:19 UTC|newest]
Thread overview: 200+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-13 0:57 [RFC PATCH 00/23] Implement an HPET-based hardlockup detector Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 01/23] x86/apic: Add a parameter for the APIC delivery mode Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 02/23] genirq: Introduce IRQD_DELIVER_AS_NMI Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 03/23] genirq: Introduce IRQF_DELIVER_AS_NMI Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
[not found] ` <1528851463-21140-4-git-send-email-ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-06-13 8:34 ` Peter Zijlstra
2018-06-13 8:34 ` Peter Zijlstra
2018-06-13 8:34 ` Peter Zijlstra
2018-06-13 8:59 ` Julien Thierry
2018-06-13 8:59 ` Julien Thierry
2018-06-13 8:59 ` Julien Thierry
2018-06-13 9:20 ` Thomas Gleixner
2018-06-13 9:20 ` Thomas Gleixner
2018-06-13 9:20 ` Thomas Gleixner
2018-06-13 9:36 ` Julien Thierry
2018-06-13 9:36 ` Julien Thierry
2018-06-13 9:36 ` Julien Thierry
[not found] ` <344b838e-81e3-97d8-f90d-315fed7879c1-5wv7dgnIgG8@public.gmane.org>
2018-06-13 9:49 ` Julien Thierry
2018-06-13 9:49 ` Julien Thierry
2018-06-13 9:49 ` Julien Thierry
2018-06-13 9:57 ` Thomas Gleixner
2018-06-13 9:57 ` Thomas Gleixner
2018-06-13 9:57 ` Thomas Gleixner
2018-06-13 10:25 ` Julien Thierry
2018-06-13 10:25 ` Julien Thierry
2018-06-13 10:25 ` Julien Thierry
[not found] ` <alpine.DEB.2.21.1806131104570.2280-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2018-06-13 10:06 ` Marc Zyngier
2018-06-13 10:06 ` Marc Zyngier
2018-06-13 10:06 ` Marc Zyngier
2018-06-15 2:12 ` Ricardo Neri
2018-06-15 2:12 ` Ricardo Neri
2018-06-15 2:12 ` Ricardo Neri
2018-06-15 8:01 ` Julien Thierry
2018-06-15 8:01 ` Julien Thierry
2018-06-15 8:01 ` Julien Thierry
[not found] ` <4eb34b18-11f8-7d70-46a5-f206d127b768-5wv7dgnIgG8@public.gmane.org>
2018-06-16 0:39 ` Ricardo Neri
2018-06-16 0:39 ` Ricardo Neri
2018-06-16 0:39 ` Ricardo Neri
2018-06-16 13:36 ` Thomas Gleixner
2018-06-16 13:36 ` Thomas Gleixner
2018-06-16 13:36 ` Thomas Gleixner
2018-06-13 0:57 ` [RFC PATCH 04/23] iommu/vt-d/irq_remapping: Add support for IRQCHIP_CAN_DELIVER_AS_NMI Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 05/23] x86/msi: " Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 06/23] x86/ioapic: Add support for IRQCHIP_CAN_DELIVER_AS_NMI with interrupt remapping Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 07/23] x86/hpet: Expose more functions to read and write registers Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 08/23] x86/hpet: Calculate ticks-per-second in a separate function Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 09/23] x86/hpet: Reserve timer for the HPET hardlockup detector Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 10/23] x86/hpet: Relocate flag definitions to a header file Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 11/23] x86/hpet: Configure the timer used by the hardlockup detector Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 12/23] kernel/watchdog: Introduce a struct for NMI watchdog operations Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 7:41 ` Nicholas Piggin
2018-06-13 7:41 ` Nicholas Piggin
2018-06-13 7:41 ` Nicholas Piggin
[not found] ` <20180613174141.539fc6c1-a5aMA/AkCkgK5Ils6ZIQy0EOCMrvLtNR@public.gmane.org>
2018-06-13 8:42 ` Peter Zijlstra
2018-06-13 8:42 ` Peter Zijlstra
2018-06-13 8:42 ` Peter Zijlstra
2018-06-13 9:26 ` Thomas Gleixner
2018-06-13 9:26 ` Thomas Gleixner
2018-06-13 9:26 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1806131121180.2280-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2018-06-13 11:52 ` Nicholas Piggin
2018-06-13 11:52 ` Nicholas Piggin
2018-06-13 11:52 ` Nicholas Piggin
[not found] ` <20180613215225.2a938abc-a5aMA/AkCkgK5Ils6ZIQy0EOCMrvLtNR@public.gmane.org>
2018-06-14 1:31 ` Ricardo Neri
2018-06-14 1:31 ` Ricardo Neri
2018-06-14 1:31 ` Ricardo Neri
2018-06-14 2:32 ` Nicholas Piggin
2018-06-14 2:32 ` Nicholas Piggin
2018-06-14 2:32 ` Nicholas Piggin
2018-06-14 8:32 ` Thomas Gleixner
2018-06-14 8:32 ` Thomas Gleixner
2018-06-14 8:32 ` Thomas Gleixner
2018-06-15 2:21 ` Ricardo Neri
2018-06-15 2:21 ` Ricardo Neri
2018-06-15 2:21 ` Ricardo Neri
2018-06-14 1:26 ` Ricardo Neri
2018-06-14 1:26 ` Ricardo Neri
2018-06-14 1:26 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 13/23] watchdog/hardlockup: Define a generic function to detect hardlockups Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 14/23] watchdog/hardlockup: Decouple the hardlockup detector from perf Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
[not found] ` <1528851463-21140-15-git-send-email-ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-06-13 8:43 ` Peter Zijlstra
2018-06-13 8:43 ` Peter Zijlstra
2018-06-13 8:43 ` Peter Zijlstra
2018-06-14 1:19 ` Ricardo Neri [this message]
2018-06-14 1:19 ` Ricardo Neri
2018-06-14 1:19 ` Ricardo Neri
2018-06-14 1:41 ` Nicholas Piggin
2018-06-14 1:41 ` Nicholas Piggin
2018-06-14 1:41 ` Nicholas Piggin
2018-06-15 2:23 ` Ricardo Neri
2018-06-15 2:23 ` Ricardo Neri
2018-06-15 2:23 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 15/23] kernel/watchdog: Add a function to obtain the watchdog_allowed_mask Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 16/23] watchdog/hardlockup: Add an HPET-based hardlockup detector Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
[not found] ` <1528851463-21140-17-git-send-email-ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-06-13 5:23 ` Randy Dunlap
2018-06-13 5:23 ` Randy Dunlap
2018-06-13 5:23 ` Randy Dunlap
[not found] ` <1e5bc136-4123-328a-2d2e-e6f2faef5bf4-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-06-14 1:00 ` Ricardo Neri
2018-06-14 1:00 ` Ricardo Neri
2018-06-14 1:00 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 17/23] watchdog/hardlockup/hpet: Convert the timer's interrupt to NMI Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
[not found] ` <1528851463-21140-18-git-send-email-ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-06-13 9:07 ` Peter Zijlstra
2018-06-13 9:07 ` Peter Zijlstra
2018-06-13 9:07 ` Peter Zijlstra
[not found] ` <20180613090720.GV12258-Nxj+rRp3nVydTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2018-06-15 2:07 ` Ricardo Neri
2018-06-15 2:07 ` Ricardo Neri
2018-06-15 2:07 ` Ricardo Neri
2018-06-13 9:40 ` Thomas Gleixner
2018-06-13 9:40 ` Thomas Gleixner
2018-06-13 9:40 ` Thomas Gleixner
2018-06-15 2:03 ` Ricardo Neri
2018-06-15 2:03 ` Ricardo Neri
2018-06-15 2:03 ` Ricardo Neri
2018-06-15 9:19 ` Thomas Gleixner
2018-06-15 9:19 ` Thomas Gleixner
2018-06-15 9:19 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1806151029210.2079-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2018-06-16 0:51 ` Ricardo Neri
2018-06-16 0:51 ` Ricardo Neri
2018-06-16 0:51 ` Ricardo Neri
2018-06-16 13:24 ` Thomas Gleixner
2018-06-16 13:24 ` Thomas Gleixner
2018-06-16 13:24 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1806161517050.1582-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2018-06-20 0:15 ` Ricardo Neri
2018-06-20 0:15 ` Ricardo Neri
2018-06-20 0:15 ` Ricardo Neri
2018-06-20 0:25 ` Randy Dunlap
2018-06-20 0:25 ` Randy Dunlap
2018-06-20 0:25 ` Randy Dunlap
2018-06-21 0:25 ` Ricardo Neri
2018-06-21 0:25 ` Ricardo Neri
2018-06-21 0:25 ` Ricardo Neri
2018-06-20 7:47 ` Thomas Gleixner
2018-06-20 7:47 ` Thomas Gleixner
2018-06-20 7:47 ` Thomas Gleixner
2018-06-13 0:57 ` [RFC PATCH 18/23] watchdog/hardlockup/hpet: Add the NMI watchdog operations Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 19/23] watchdog/hardlockup: Make arch_touch_nmi_watchdog() to hpet-based implementation Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 20/23] watchdog/hardlockup/hpet: Rotate interrupt among all monitored CPUs Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 9:48 ` Thomas Gleixner
2018-06-13 9:48 ` Thomas Gleixner
2018-06-13 9:48 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1806131140560.2280-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2018-06-15 2:16 ` Ricardo Neri
2018-06-15 2:16 ` Ricardo Neri
2018-06-15 2:16 ` Ricardo Neri
2018-06-15 10:29 ` Thomas Gleixner
2018-06-15 10:29 ` Thomas Gleixner
2018-06-15 10:29 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.21.1806151122070.2079-ecDvlHI5BZPZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2018-06-16 0:46 ` Ricardo Neri
2018-06-16 0:46 ` Ricardo Neri
2018-06-16 0:46 ` Ricardo Neri
2018-06-16 13:27 ` Thomas Gleixner
2018-06-16 13:27 ` Thomas Gleixner
2018-06-16 13:27 ` Thomas Gleixner
2018-06-13 0:57 ` [RFC PATCH 21/23] watchdog/hardlockup/hpet: Adjust timer expiration on the number of " Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` [RFC PATCH 22/23] watchdog/hardlockup/hpet: Only enable the HPET watchdog via a boot parameter Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
[not found] ` <1528851463-21140-23-git-send-email-ricardo.neri-calderon-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-06-13 5:26 ` Randy Dunlap
2018-06-13 5:26 ` Randy Dunlap
2018-06-13 5:26 ` Randy Dunlap
[not found] ` <c2edf778-79cf-009d-6617-13e54ad8b93b-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-06-14 0:58 ` Ricardo Neri
2018-06-14 0:58 ` Ricardo Neri
2018-06-14 0:58 ` Ricardo Neri
2018-06-14 3:30 ` Randy Dunlap
2018-06-14 3:30 ` Randy Dunlap
2018-06-14 3:30 ` Randy Dunlap
2018-06-13 0:57 ` [RFC PATCH 23/23] watchdog/hardlockup: Activate the HPET-based lockup detector Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
2018-06-13 0:57 ` Ricardo Neri
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