site stats

Linux kernel irq affinity cpus patch

NettetIRQs have an associated "affinity" property, smp_affinity, which defines the CPU cores that are allowed to execute the ISR for that IRQ. This property can be used to improve … Nettet1. jul. 2002 · The IRQ is routed to the CPU with lowest XTP register value, the search begins at the default CPU. Therefore most of the interrupts will be handled by CPU #0. …

Linux-Kernel Archive: [tip: irq/core] genirq: Always limit the affinity ...

NettetToggle navigation Patchwork Linux PCI development list Patches Bundles About this project Login; Register; Mail settings; 12386461 diff mbox series [v4,02/14] iavf: Use irq_update_affinity_hint. Message ID: [email protected] (mailing list archive) State: Not Applicable: Headers: show. Series: genirq ... Nettet21. jul. 2011 · On 7/21/2011 8:55 PM, Russell King - ARM Linux wrote: > Now that the GIC takes care of selecting a target interrupt from the > affinity mask, we don't need all … shootout percentage nhl https://xlaconcept.com

Re: [PATCH 10/13] x86/irq: Limit IOAPIC and MSI domains

NettetIn our case, the broadcast timer uses dw-apb-ictl as the interrupt chip. These patches try to add irq_set_affinity support so that the going to deep idle state cpu can set the … Nettet27. mar. 2024 · This makes setting IRQ affinity impossible as migrating wired interrupt to different core will end up migrating all events to that core. And since DMA events … NettetThe Linux kernel user’s and administrator’s guide; Kernel Build System; The Linux kernel firmware guide; Open Firmware and Devicetree; The Linux kernel user-space … shootout online

[RFC PATCH v4 4/4] arm: fix a migrating irq bug when hotplug cpu …

Category:[PATCH 1/2] Revert "arm64: use cpu_online_mask when using …

Tags:Linux kernel irq affinity cpus patch

Linux kernel irq affinity cpus patch

SMP IRQ affinity — The Linux Kernel documentation

NettetLinux-SCSI Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH v5 00/14] genirq: Cleanup the abuse of irq_set_affinity_hint() @ 2024-07-20 23:26 Nitesh Narayan Lal 2024-07-20 23:26 ` [PATCH v5 01/14] genirq: Provide new interfaces for affinity hints Nitesh Narayan Lal ` (14 more replies) 0 siblings, 15 replies; 28+ messages in thread … NettetHowever, irq_set_affinity_hint() applying the provided cpumask as an affinity (if not NULL) for the interrupt is an undocumented side effect. To remove this side effect …

Linux kernel irq affinity cpus patch

Did you know?

Nettet17. jun. 2024 · The driver uses irq_set_affinity_hint () to: - Set the affinity_hint which is consumed by the userspace for distributing the interrupts - Enforce affinity As per … NettetOnce IRQ is allocated/activated its affinity bitmask will be set to the default mask. It can then be changed as described above. Default mask is 0xffffffff. Here is an example of …

NettetThis document lists per-CPU kthreads in the Linux kernel and presents options to control their OS jitter. Note that non-per-CPU kthreads are not listed here. To reduce OS jitter … Nettet18. mai 2024 · gic-v3 seems only suppot distribute hwirq to one CPU in dispite of setting it via /proc/irq/*/smp_affinity. My RK3399 platform has 6 CPUs and I was trying to bind …

NettetThe current implementation of irq_set_affinity () refuses rightfully to route an interrupt to an offline cpu. But there is a special case, where this is actually desired. Some of the … Nettet10. apr. 2024 · [tip: irq/core] genirq: Always limit the affinity to online CPUs From: tip-bot2 for Marc Zyngier Date: Sun Apr 10 2024 - 15:13:07 EST Next message: tip-bot2 for …

NettetIn our case, the broadcast timer uses dw-apb-ictl as the interrupt chip. These patches try to add irq_set_affinity support so that the going to deep idle state cpu can set the interrupt affinity of the broadcast interrupt to avoid unnecessary wakeups and IPIs. Changes since v2: - Add a DT option to indicate whether we want to set the irq affinity.

NettetYes, modify of the interrupt affinity will be delayed until the *next* interrupt eoi handler(in hard_irq context). This is the difference from x86, which do irq_move_irq in ack handler, and then transfer the current interrupt to the new CPU without other affect. > JG -- Regards, Yipeng Zou shootout phone gripsNettetSome drivers need an extra set of interrupts which are not marked managed, but should get initial interrupt spreading. To achieve this it is simpler to set the is_managed bit of the affinity descriptor in the spreading function instead of … shootout philadelphiaNettetWith these systems, > you cannot set the affinity of individual MSIs (they don't target a > CPU, they target another interrupt... braindead). Only the mux > interrupt can have its affinity changed. > > So returning -EINVAL is the right thing to do. shootout penalty