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Message-ID: <29d65c22-747a-2538-cc17-db619c85b8f8@redhat.com>
Date:   Wed, 12 Oct 2022 09:21:11 -0400
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Subject: Re: [PATCH] locking/rwsem: Prevent non-first waiter from spinning in
 down_write() slowpath
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To:     =?UTF-8?B?VGluZzExIFdhbmcg546L5am3?= <wangting11@xiaomi.com>
Cc:     Mukesh Ojha <quic_mojha@quicinc.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        "john.p.donnelly" <john.p.donnelly@oracle.com>,
        Hillf Danton <hdanton@sina.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Will Deacon <will@kernel.org>,
        Boqun Feng <boqun.feng@gmail.com>,
        Ingo Molnar <mingo@redhat.com>
References: <20220929180413.107374-1-longman@redhat.com>
 <6530f135-e8ac-bb6c-4715-1ea8f76cf4c4@redhat.com>
 <7cbf49c9-d122-30e6-68b3-c61eca63e5dc@quicinc.com>
 <4c4e5208-ddf5-6191-64b0-54ae0bed1af6@redhat.com>
 <03421f0e453143f6ae4a9a7a8a4f47f4@xiaomi.com>
 <446288c6c7db4ab2b23f7041baa62335@xiaomi.com>
From:   Waiman Long <longman@redhat.com>
In-Reply-To: <446288c6c7db4ab2b23f7041baa62335@xiaomi.com>
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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