On 09/08/16 13:25, Craig Gallek wrote: > From: Craig Gallek <kr...@google.com> > > Add struct kobject to struct irq_desc to allow for easy export > to sysfs. This allows for much simpler userspace-parsing of > the information contained in struct irq_desc. > > Note that sysfs is not available at the time of early irq initialization. > These interrupts are accounted for using a postcore_initcall callback. > > Examples: > /sys/kernel/irq/18/actions: i801_smbus,ehci_hcd:usb1,uhci_hcd:usb7 > /sys/kernel/irq/18/chip_name: IR-IO-APIC > /sys/kernel/irq/18/hwirq: 18 > /sys/kernel/irq/18/name: fasteoi > /sys/kernel/irq/18/per_cpu_count: 0,0 > /sys/kernel/irq/18/type: level > > /sys/kernel/irq/25/actions: ahci0 > /sys/kernel/irq/25/chip_name: IR-PCI-MSI > /sys/kernel/irq/25/hwirq: 512000 > /sys/kernel/irq/25/name: edge > /sys/kernel/irq/25/per_cpu_count: 29036,0 > /sys/kernel/irq/25/type: edge
Thanks for the update. One concern: This per_cpu_count is for online CPUs only. How does this help when the online CPUs change? E.g., above could be for CPUs 1 and 5. The next time that it is read it could be for CPUs 0 and 3. Seems that it could be confusing even for software reading it. -- ~Randy
