linux-kernel - Re: [PATCH v8 07/19] locking/rwsem: Implement lock handoff to prevent lock starvation

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Message-ID: <CAHttsrYVHXZTtC7fTRn-osH-yYzC-GUhpQJVapWp0UhPsGfZxA@mail.gmail.com>
Date:   Wed, 5 Jun 2019 15:48:49 +0800
From:   Yuyang Du <duyuyang@...il.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Boqun Feng <boqun.feng@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Davidlohr Bueso <dave@...olabs.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        huang ying <huang.ying.caritas@...il.com>
Subject: Re: [PATCH v8 07/19] locking/rwsem: Implement lock handoff to prevent
 lock starvation

Hi Waiman,

On Wed, 5 Jun 2019 at 00:00, Waiman Long <longman@...hat.com> wrote:
> With my patchset applied, the reader-writer ordering is still supposed
> to be preserved. Of course, there can be exceptions depending on the
> exact timing, but we can't rely on that to prevent deadlock.

This is exactly what I want to know. Thanks for the reply.

Thanks,
Yuyang