Re: [patch V2 0/7] fs: Substitute bit-spinlocks for PREEMPT_RT and debugging

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On Fri, Aug 02, 2019 at 11:07:53AM +0200, Thomas Gleixner wrote:
> Last time I did, there was resistance :)

Do you have a pointer?  Note that in the buffer head case maybe
a hash lock based on the page address is even better, as we only
ever use the lock in the first buffer head of a page anyway..

> What about the page lock?
> 
>   mm/slub.c:      bit_spin_lock(PG_locked, &page->flags);

One caller ouf of a gazillion that spins on the page lock instead of
sleepign on it like everyone else.  That should not have passed your
smell test to start with :)



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