From: Nitesh Lal <nilal@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Robin Murphy <robin.murphy@arm.com>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
"frederic@kernel.org" <frederic@kernel.org>,
"juri.lelli@redhat.com" <juri.lelli@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
jbrandeb@kernel.org, Alex Belits <abelits@marvell.com>,
"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"rostedt@goodmis.org" <rostedt@goodmis.org>,
"peterz@infradead.org" <peterz@infradead.org>,
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netdev@vger.kernel.org, chris.friesen@windriver.com,
Marc Zyngier <maz@kernel.org>
Subject: Re: [PATCH tip:irq/core v1] genirq: remove auto-set of the mask when setting the hint
Date: Mon, 17 May 2021 17:13:18 -0400 [thread overview]
Message-ID: <CAFki+L=RaSZXASAaAxBf=RJqXWju+pkSj3ftMkmoqCLPfg0v=g@mail.gmail.com> (raw)
In-Reply-To: <87y2cddtxb.ffs@nanos.tec.linutronix.de>
On Mon, May 17, 2021 at 3:47 PM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> Nitesh,
>
> On Mon, May 17 2021 at 14:21, Nitesh Lal wrote:
> > On Mon, May 17, 2021 at 1:26 PM Robin Murphy <robin.murphy@arm.com> wrote:
> >
> > We can use irq_set_affinity() to set the hint mask as well, however, maybe
> > there is a specific reason behind separating those two in the
> > first place (maybe not?).
>
> Yes, because kernel side settings might overwrite the hint.
>
> > But even in this case, we have to either modify the PMU drivers' IRQs
> > affinity from the userspace or we will have to make changes in the existing
> > request_irq code path.
>
> Adjusting them from user space does not work for various reasons,
> especially CPU hotplug.
>
> > I am not sure about the latter because we already have the required controls
> > to adjust the device IRQ mask (by using default_smp_affinity or by modifying
> > them manually).
>
> default_smp_affinity does not help at all and there is nothing a module
> can modify manually.
Right, it will not help a module.
>
> I'll send out a patch series which cleans that up soon.
Ack, thanks.
>
> Thanks,
>
> tglx
>
>
--
Nitesh
next prev parent reply other threads:[~2021-05-17 21:13 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-01 2:18 [PATCH tip:irq/core v1] genirq: remove auto-set of the mask when setting the hint Jesse Brandeburg
2021-05-04 12:15 ` Robin Murphy
2021-05-04 14:29 ` Nitesh Lal
2021-05-04 16:23 ` Jesse Brandeburg
2021-05-17 16:57 ` Nitesh Lal
2021-05-17 17:26 ` Robin Murphy
2021-05-17 18:08 ` Thomas Gleixner
2021-05-17 18:50 ` Robin Murphy
2021-05-17 19:08 ` Thomas Gleixner
2021-05-17 19:43 ` Thomas Gleixner
2021-05-17 20:18 ` Thomas Gleixner
2021-05-17 18:21 ` Nitesh Lal
2021-05-17 19:47 ` Thomas Gleixner
2021-05-17 21:13 ` Nitesh Lal [this message]
2021-05-17 20:48 ` Thomas Gleixner
2021-05-17 22:44 ` Nitesh Lal
2021-05-18 0:03 ` Thomas Gleixner
2021-05-18 0:23 ` Nitesh Lal
2021-05-20 21:57 ` Nitesh Lal
2021-05-21 0:03 ` Nitesh Lal
2021-05-21 11:56 ` Thomas Gleixner
2021-05-21 12:03 ` [PATCH] genirq: Provide new interfaces for affinity hints Thomas Gleixner
2021-05-21 15:45 ` Lijun Pan
2021-05-21 21:45 ` Thomas Gleixner
2021-05-21 16:13 ` Nitesh Lal
2021-05-21 21:48 ` Thomas Gleixner
2021-06-04 20:35 ` Nitesh Lal
2021-05-27 10:03 ` Shung-Hsi Yu
2021-05-27 10:21 ` Shung-Hsi Yu
2021-05-27 13:06 ` Nitesh Lal
2021-05-28 7:20 ` Shung-Hsi Yu
2021-06-07 17:00 ` Nitesh Lal
2021-06-14 16:12 ` Nitesh Lal
2021-05-21 13:46 ` [PATCH tip:irq/core v1] genirq: remove auto-set of the mask when setting the hint Nitesh Lal
2021-05-21 15:15 ` Thomas Gleixner
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