linux-kernel - Re: [PATCH] locking/rwsem: Prevent non-first waiter from spinning in down

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Message-ID: <29d65c22-747a-2538-cc17-db619c85b8f8@redhat.com>
Date:   Wed, 12 Oct 2022 09:21:11 -0400
From:   Waiman Long <longman@...hat.com>
To:     Ting11 Wang 王婷 <wangting11@...omi.com>
Cc:     Mukesh Ojha <quic_mojha@...cinc.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "john.p.donnelly" <john.p.donnelly@...cle.com>,
        Hillf Danton <hdanton@...a.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] locking/rwsem: Prevent non-first waiter from spinning in
 down_write() slowpath

On 10/11/22 03:20, Ting11 Wang 王婷 wrote:
> Hi Waiman,
>
> Thanks for your quick reply.
> Regarding this issue, we have done a lot of testing on our devices and found that the first patch is the most effective,is it possible to using this patch?
>
> https://lore.kernel.org/lkml/e1cb435a-4471-ac3a-344f-04448f167c9f@quicinc.com/
>
Yes, I am going to resurrect this patch.

Cheers,
Longman