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Date:   Mon, 7 Dec 2020 19:53:14 -0800
From:   Davidlohr Bueso <>
To:     Waiman Long <>
Cc:     Peter Zijlstra <>,
        Ingo Molnar <>, Will Deacon <>,, Phil Auld <>
Subject: Re: [PATCH 3/5] locking/rwsem: Enable reader optimistic lock stealing

On Tue, 17 Nov 2020, Waiman Long wrote:

>If the optimistic spinning queue is empty and the rwsem does not have
>the handoff or write-lock bits set, it is actually not necessary to
>call rwsem_optimistic_spin() to spin on it. Instead, it can steal the
>lock directly as its reader bias is in the count already.  If it is
>the first reader in this state, it will try to wake up other readers
>in the wait queue.
>Signed-off-by: Waiman Long <>

Reviewed-by: Davidlohr Bueso <>

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