linux-kernel - Re: [RFC] locking/rwsem: Avoid issuing wakeup before setting the reader waiter to nil

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Message-ID: <20190107153125.GL2218@hirez.programming.kicks-ass.net>
Date:   Mon, 7 Jan 2019 16:31:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Yongji Xie <elohimes@...il.com>, dave@...olabs.net,
        mingo@...hat.com, will.deacon@....com,
        linux-kernel@...r.kernel.org, Xie Yongji <xieyongji@...du.com>,
        zhangyu31@...du.com, liuqi16@...du.com, yuanlinsi01@...du.com,
        nixun@...du.com, lilin24@...du.com,
        andrea.parri@...rulasolutions.com
Subject: Re: [RFC] locking/rwsem: Avoid issuing wakeup before setting the
 reader waiter to nil

On Mon, Jan 07, 2019 at 09:35:09AM -0500, Waiman Long wrote:
> On 12/17/2018 08:12 AM, Yongji Xie wrote:
> > On Mon, 17 Dec 2018 at 19:37, Peter Zijlstra <peterz@...radead.org> wrote:
> >> On Mon, Dec 10, 2018 at 11:12:52PM +0800, Yongji Xie wrote:
> >>> Hi Peter,
> >>>
> >>> Please let me know If there is any progress on this issue. Thank you!
> >> Right, sorry, my brain was filled with snot and didn't want to make
> >> sense of things.
> >>
> >> I've put some patches here:
> >>
> >>   git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/core
> >>
> >> Could you have a look?
> > That looks good to me. Thank you!
> >
> > Thanks,
> > Yongji
> 
> Peter,
> 
> Are you planning to move the patch over to tip as the merge window has
> just closed?

Sorry; yes, probably, I just got back from a 2 week holiday and am
somewhat scrambling to remember where I left off and what all landed in
my inbox.