From: Thomas Gleixner <tglx@linutronix.de>
To: Nitesh Narayan Lal <nitesh@redhat.com>,
Jacob Keller <jacob.e.keller@intel.com>,
Marcelo Tosatti <mtosatti@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
helgaas@kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, linux-pci@vger.kernel.org,
intel-wired-lan@lists.osuosl.org, frederic@kernel.org,
sassmann@redhat.com, jesse.brandeburg@intel.com,
lihong.yang@intel.com, jeffrey.t.kirsher@intel.com,
jlelli@redhat.com, hch@infradead.org, bhelgaas@google.com,
mike.marciniszyn@intel.com, dennis.dalessandro@intel.com,
thomas.lendacky@amd.com, jiri@nvidia.com, mingo@redhat.com,
juri.lelli@redhat.com, vincent.guittot@linaro.org,
lgoncalv@redhat.com, Jakub Kicinski <kuba@kernel.org>
Subject: Re: [PATCH v4 4/4] PCI: Limit pci_alloc_irq_vectors() to housekeeping CPUs
Date: Mon, 26 Oct 2020 23:49:35 +0100 [thread overview]
Message-ID: <875z6w38n4.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <959997ee-f393-bab0-45c0-4144c37b9185@redhat.com>
On Mon, Oct 26 2020 at 18:22, Nitesh Narayan Lal wrote:
> On 10/26/20 5:50 PM, Thomas Gleixner wrote:
>> But I still think that for curing that isolation stuff we want at least
>> some information from the driver. Alternative solution would be to grant
>> the allocation of interrupts and queues and have some sysfs knob to shut
>> down queues at runtime. If that shutdown results in releasing the queue
>> interrupt (via free_irq()) then the vector exhaustion problem goes away.
>
> I think this is close to what I and Marcelo were discussing earlier today
> privately.
>
> I don't think there is currently a way to control the enablement/disablement of
> interrupts from the userspace.
You cannot just disable the interrupt. You need to make sure that the
associated queue is shutdown or quiesced _before_ the interrupt is shut
down.
Thanks,
tglx
next prev parent reply other threads:[~2020-10-26 22:49 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 18:35 [PATCH v4 0/4] isolation: limit msix vectors to housekeeping CPUs Nitesh Narayan Lal
2020-09-28 18:35 ` [PATCH v4 1/4] sched/isolation: API to get number of " Nitesh Narayan Lal
2020-09-28 18:35 ` [PATCH v4 2/4] sched/isolation: Extend nohz_full to isolate managed IRQs Nitesh Narayan Lal
2020-10-23 13:25 ` Peter Zijlstra
2020-10-23 13:29 ` Frederic Weisbecker
2020-10-23 13:57 ` Nitesh Narayan Lal
2020-10-23 13:45 ` Nitesh Narayan Lal
2020-09-28 18:35 ` [PATCH v4 3/4] i40e: Limit msix vectors to housekeeping CPUs Nitesh Narayan Lal
2020-09-28 18:35 ` [PATCH v4 4/4] PCI: Limit pci_alloc_irq_vectors() " Nitesh Narayan Lal
2020-09-28 21:59 ` Bjorn Helgaas
2020-09-29 17:46 ` Christoph Hellwig
2020-10-16 12:20 ` Peter Zijlstra
2020-10-18 18:14 ` Nitesh Narayan Lal
2020-10-19 11:11 ` Peter Zijlstra
2020-10-19 14:00 ` Marcelo Tosatti
2020-10-19 14:25 ` Nitesh Narayan Lal
2020-10-20 7:30 ` Peter Zijlstra
2020-10-20 13:00 ` Nitesh Narayan Lal
2020-10-20 13:41 ` Peter Zijlstra
2020-10-20 14:39 ` Nitesh Narayan Lal
2020-10-22 17:47 ` Nitesh Narayan Lal
2020-10-23 8:58 ` Peter Zijlstra
2020-10-23 13:10 ` Nitesh Narayan Lal
2020-10-23 21:00 ` Thomas Gleixner
2020-10-26 13:35 ` Nitesh Narayan Lal
2020-10-26 13:57 ` Thomas Gleixner
2020-10-26 17:30 ` Marcelo Tosatti
2020-10-26 19:00 ` Thomas Gleixner
2020-10-26 19:11 ` Marcelo Tosatti
2020-10-26 19:21 ` Jacob Keller
2020-10-26 20:11 ` Thomas Gleixner
2020-10-26 21:11 ` Jacob Keller
2020-10-26 21:50 ` Thomas Gleixner
2020-10-26 22:13 ` Jakub Kicinski
2020-10-26 22:46 ` Thomas Gleixner
2020-10-26 22:52 ` Jacob Keller
2020-10-26 22:22 ` Nitesh Narayan Lal
2020-10-26 22:49 ` Thomas Gleixner [this message]
2020-10-26 23:08 ` Jacob Keller
2020-10-27 14:28 ` Thomas Gleixner
2020-10-27 11:47 ` Marcelo Tosatti
2020-10-27 14:43 ` Thomas Gleixner
2020-10-19 14:21 ` Frederic Weisbecker
2020-10-20 14:16 ` Thomas Gleixner
2020-10-20 16:18 ` Nitesh Narayan Lal
2020-10-20 18:07 ` Thomas Gleixner
2020-10-21 20:25 ` Thomas Gleixner
2020-10-21 21:04 ` Nitesh Narayan Lal
2020-10-22 0:02 ` Jakub Kicinski
2020-10-22 0:27 ` Jacob Keller
2020-10-22 8:28 ` Thomas Gleixner
2020-10-22 12:28 ` Marcelo Tosatti
2020-10-22 22:39 ` Thomas Gleixner
2020-10-01 15:49 ` [PATCH v4 0/4] isolation: limit msix vectors " Frederic Weisbecker
2020-10-08 21:40 ` Nitesh Narayan Lal
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