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>, "davem@davemloft.net" <davem@davemloft.net>, "akpm@linux-foundation.org" <akpm@linux-foundation.org>, "sfr@canb.auug.org.au" <sfr@canb.auug.org.au>, "stephen@networkplumber.org" <stephen@networkplumber.org>, "rppt@linux.vnet.ibm.com" <rppt@linux.vnet.ibm.com>, "jinyuqi@huawei.com" <jinyuqi@huawei.com>, "zhangshaokun@hisilicon.com" <zhangshaokun@hisilicon.com>, 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
WARNING: multiple messages have this Message-ID (diff)
From: Nitesh Lal <nilal@redhat.com> To: intel-wired-lan@osuosl.org Subject: [Intel-wired-lan] [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: 71+ 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 2021-05-01 2:18 ` [Intel-wired-lan] " Jesse Brandeburg 2021-05-04 12:15 ` Robin Murphy 2021-05-04 12:15 ` [Intel-wired-lan] " Robin Murphy 2021-05-04 14:29 ` Nitesh Lal 2021-05-04 14:29 ` [Intel-wired-lan] " Nitesh Lal 2021-05-04 16:23 ` Jesse Brandeburg 2021-05-04 16:23 ` [Intel-wired-lan] " Jesse Brandeburg 2021-05-17 16:57 ` Nitesh Lal 2021-05-17 16:57 ` [Intel-wired-lan] " Nitesh Lal 2021-05-17 17:26 ` Robin Murphy 2021-05-17 17:26 ` [Intel-wired-lan] " Robin Murphy 2021-05-17 18:08 ` Thomas Gleixner 2021-05-17 18:08 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-17 18:50 ` Robin Murphy 2021-05-17 18:50 ` [Intel-wired-lan] " Robin Murphy 2021-05-17 19:08 ` Thomas Gleixner 2021-05-17 19:08 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-17 19:43 ` Thomas Gleixner 2021-05-17 19:43 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-17 20:18 ` Thomas Gleixner 2021-05-17 20:18 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-17 18:21 ` Nitesh Lal 2021-05-17 18:21 ` [Intel-wired-lan] " Nitesh Lal 2021-05-17 19:47 ` Thomas Gleixner 2021-05-17 19:47 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-17 21:13 ` Nitesh Lal [this message] 2021-05-17 21:13 ` Nitesh Lal 2021-05-17 20:48 ` Thomas Gleixner 2021-05-17 20:48 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-17 22:44 ` Nitesh Lal 2021-05-17 22:44 ` [Intel-wired-lan] " Nitesh Lal 2021-05-18 0:03 ` Thomas Gleixner 2021-05-18 0:03 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-18 0:23 ` Nitesh Lal 2021-05-18 0:23 ` [Intel-wired-lan] " Nitesh Lal 2021-05-20 21:57 ` Nitesh Lal 2021-05-20 21:57 ` [Intel-wired-lan] " Nitesh Lal 2021-05-21 0:03 ` Nitesh Lal 2021-05-21 0:03 ` [Intel-wired-lan] " Nitesh Lal 2021-05-21 11:56 ` Thomas Gleixner 2021-05-21 11:56 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-21 12:03 ` [PATCH] genirq: Provide new interfaces for affinity hints Thomas Gleixner 2021-05-21 12:03 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-21 15:45 ` Lijun Pan 2021-05-21 15:45 ` [Intel-wired-lan] " Lijun Pan 2021-05-21 21:45 ` Thomas Gleixner 2021-05-21 21:45 ` [Intel-wired-lan] " Thomas Gleixner 2021-05-21 16:13 ` Nitesh Lal 2021-05-21 16:13 ` [Intel-wired-lan] " Nitesh Lal 2021-05-21 21:48 ` Thomas Gleixner 2021-05-21 21:48 ` [Intel-wired-lan] " Thomas Gleixner 2021-06-04 20:35 ` Nitesh Lal 2021-06-04 20:35 ` [Intel-wired-lan] " Nitesh Lal 2021-05-27 10:03 ` Shung-Hsi Yu 2021-05-27 10:03 ` [Intel-wired-lan] " Shung-Hsi Yu 2021-05-27 10:21 ` Shung-Hsi Yu 2021-05-27 10:21 ` [Intel-wired-lan] " Shung-Hsi Yu 2021-05-27 13:06 ` Nitesh Lal 2021-05-27 13:06 ` [Intel-wired-lan] " Nitesh Lal 2021-05-28 7:20 ` Shung-Hsi Yu 2021-05-28 7:20 ` [Intel-wired-lan] " Shung-Hsi Yu 2021-06-07 17:00 ` Nitesh Lal 2021-06-07 17:00 ` [Intel-wired-lan] " Nitesh Lal 2021-06-14 16:12 ` Nitesh Lal 2021-06-14 16:12 ` [Intel-wired-lan] " 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 13:46 ` [Intel-wired-lan] " Nitesh Lal 2021-05-21 15:15 ` Thomas Gleixner 2021-05-21 15:15 ` [Intel-wired-lan] " Thomas Gleixner 2021-12-10 19:54 ` [tip: irq/core] genirq: Provide new interfaces for affinity hints tip-bot2 for Thomas Gleixner
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