Messages in this thread | | | Date | Thu, 19 Jan 2023 09:48:18 -0800 | From | Davidlohr Bueso <> | Subject | Re: [PATCH v2] locking/rwbase: Prevent indefinite writer starvation |
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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
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