Re: [PATCH v3 2/3] livepatch,sched: Add livepatch task switching to cond_resched()

[Petr Mladek]

On Fri 2023-02-24 08:50:00, Josh Poimboeuf wrote:
> There have been reports [1][2] of live patches failing to complete
> within a reasonable amount of time due to CPU-bound kthreads.
> 
> Fix it by patching tasks in cond_resched().
> 
> There are four different flavors of cond_resched(), depending on the
> kernel configuration.  Hook into all of them.
> 
> A more elegant solution might be to use a preempt notifier.  However,
> non-ORC unwinders can't unwind a preempted task reliably.
> 
> [1] https://lore.kernel.org/lkml/20220507174628.2086373-1-song@xxxxxxxxxx/
> [2] https://lkml.kernel.org/lkml/20230120-vhost-klp-switching-v1-0-7c2b65519c43@xxxxxxxxxx
> 
> Tested-by: Seth Forshee (DigitalOcean) <sforshee@xxxxxxxxxx>
> Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>
> Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

Just for record, I have double checked the changes against v2
and everything looks good to me.

Best Regards,
Petr