linux-kernel - Re: [PATCH v2 0/5] locking/rwsem: Rework reader optimistic spinning

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Message-ID: <77f74f7f-f090-ef3f-11ec-62bc89bd9a83@redhat.com>
Date:   Tue, 8 Dec 2020 11:33:38 -0500
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
        Phil Auld <pauld@...hat.com>
Subject: Re: [PATCH v2 0/5] locking/rwsem: Rework reader optimistic spinning

On 12/8/20 9:57 AM, Peter Zijlstra wrote:
> On Fri, Nov 20, 2020 at 11:14:11PM -0500, Waiman Long wrote:
>> Waiman Long (5):
>>    locking/rwsem: Pass the current atomic count to
>>      rwsem_down_read_slowpath()
>>    locking/rwsem: Prevent potential lock starvation
>>    locking/rwsem: Enable reader optimistic lock stealing
>>    locking/rwsem: Wake up all waiting readers if RWSEM_WAKE_READ_OWNED
>>    locking/rwsem: Remove reader optimistic spinning
> So I've munged the lot onto the other rwsem patches and skipped #4, I've
> not even boot tested them (will go do so shortly).
>
>    git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/core
>
I have checked the four patches in your locking/core branch. They look 
good to me. Are you planning to push the branch to tip soon so that it 
can be ready for the next merge window?

Anyway, thanks for taking my patches.

Cheers,
Longman