On Fri, Mar 31 2023 at 05:49, WenYou Yang wrote:
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Removing pointlessly copied mail headers. Please fix your email
client
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>> >
>> > So what do you want to have happen when someone goes and manually
>> > offlines all the SMT siblings using
>> > /sys/devices/system/cpu/cpu*/online
>> > ?
>>
>> I don't consider this situation. Any suggestions will be deeply appreciated.
>
> Hi Peter,
>
> I don't find a good method to handle this situation.
> Yes, manually offlining all the SMT sibling will get the same result of SMT disabling on the fly.
>
> Actually, the normal way to enable/disable SMT on the fly is to echo on/off > /sys/device/system/cpu/smt/control
That's the most convenient way, right.
But why do we need a kernel notifier for this, if you can do the same
with a sysfs knob for your driver?
Then user space can fiddle with SMT control in sysfs and afterwards tell
the driver that it should reconfigure.
That makes a ton more sense than this random notifier.
Thanks,
tglx
