Re: [PATCH] hugetlb: add cond_resched() to __unmap_hugepage_range()

[David Hildenbrand (Arm)]

On 8/19/26 10:50, Michal Hocko wrote:
> On Wed 19-08-26 09:53:25, David Hildenbrand wrote:
>> On 8/18/26 20:55, Andrew Morton wrote:
>>>
>>>
>>> Not understanding.
>>>
>>> Maybe you refer to adding a patch to -stable but not to -linus?  That's
>>> against the -stable rules
>>> (Documentation/process/stable-kernel-rules.rst).
>>
>> It's tricky: if a problem only exists in stable (there is nothing to fix in
>> Linus' tree), then a stable-only fix is acceptable.
> 
> The crucial quiestion is whether this is something that needs a code fix
> or a configuration fix. Really fighting for low latencies with
> PREEMPT_NONE is a kinda lost battle. You might want to play whack a
> mole...

Yes, I read your comment on the other thread afterwards and I agree.

The whole reason we added cond_resched() all over the place over the years was
to avoid splats from false detected hung tasks (e.g., 30s ...).

Not to optimize latency in the ms range.

-- 
Cheers,

David