Re: [rfc/patch] mm/slub: restore/expand unfreeze_partials() local exclusion scope

[Vlastimil Babka]

On 7/25/21 6:27 PM, Vlastimil Babka wrote:
>>> Hope fixing that helps then?
>>
>> Yeah, though RT should perhaps be pinned across release/re-acquire?
> 
> Probably not necessary, this_cpu_cmpxchg() will effectively recognize
> being moved to a different CPU.
> Might also move __unfreeze_partials() out of the whole loop to avoid the
> relock. Yeah that should be better.
> 
>> Actually, local locks should rediscover the recursion handling skills
>> they long had so such RT specific hole poking isn't necessary.  There
>> previously would have been no ifdef+typo there for eyeballs to miss and
>> miss and miss.
> 
> Hm, now I'm realizing that local_lock() on !RT is just
> preempt_disable(), i.e. equivalent to get_cpu_ptr(), so some of the
> ifdeffery could go away?

How much will this explode? Thanks.

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