On 2020/8/22 19:35, Thomas Gleixner wrote: > On Sat, Aug 22 2020 at 17:33, Yunfeng Ye wrote: >> On 2020/8/13 16:27, Thomas Gleixner wrote: >> For example, the cmdline "irqaffinity=0,1,126,127" on the 128 cores system： >> >> [root@localhost ~]# cat /proc/irq/4/smp_affinity_list >> 0-1,126-127 >> >> The irq 4 is "arch_timer" interrupt, which is a percpu interrupt. >> >> So is it necessary to show the percpu irq affinity correct? > > Yes, it makes sense to do so, but you used the wrong check. The correct > one is: > > irq_settings_is_per_cpu_devid() > > which will not wreckage the output for other per cpu marked interrupts > which never set the percpu_affinity pointer with the obvious > consequences... The pointer would need a NULL check in any case, but it > might be more straight forward to update affinity when percpu_affinity > is initialized. Haven't looked in detail though. > ok, I will send the patch v2, thanks. > Thanks, > > tglx > > . >
