Re: fuse uring / wake_up on the same core

[Bernd Schubert]

On 5/4/23 04:16, Hillf Danton wrote:
> 
>> +		    time_after(jiffies, p->seesaw_jiffies + 10),
>> +		    cpumask_test_cpu(cpu, p->cpus_ptr))
>> +			return cpu;

Above is a big typo, I don't even see on the first glance how this 
compiled at all.

This was supposed to be

if (p->seesaw_req && current->seesaw_proc &&
     time_after(jiffies, p->seesaw_jiffies + 10) &&
     cpumask_test_cpu(cpu, p->cpus_ptr))


Anyway, I now understand that the WF_TTWU flag is related to waitq - we 
don't need the timeout at all. But then if the main issue is about waitq 
migration, I don't understand yet why Andrei's WF_CURRENT_CPU is not 
sufficient. I'm going to investigate that next. Probably much easier to 
get that accepted that a rather fuse specific seesaw.


Thanks,
Bernd