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SubjectRe: [PATCH v2] locking/rwbase: Prevent indefinite writer starvation
On Thu, 19 Jan 2023, Davidlohr Bueso wrote:

>On Thu, 19 Jan 2023, Mel Gorman wrote:
>
>>The race could be closed by moving wait_lock acquisition before the
>>atomic_sub in rwbase_write_lock() but it expands the scope of the wait_lock
>>and I'm not sure that's necessary for either correctness or preventing
>>writer starvation. It's a more straight-forward fix but expanding the
>>scope of a lock unnecessarily has been unpopular in the past.
>
>Curiously, this is the documented behavior:
>
> * down_write/write_lock()
> * 1) Lock rtmutex
> * 2) Remove the reader BIAS to force readers into the slow path

Nevermind, this was the rtmutex, not the wait_lock, sorry for the noise.

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