linux-kernel - Re: [PATCH V3 6/9] virtio-ccw: implement synchronize

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Date:   Thu, 28 Apr 2022 01:24:43 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Halil Pasic <pasic@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        Stefano Garzarella <sgarzare@...hat.com>,
        eperezma <eperezma@...hat.com>, Cindy Lu <lulu@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH V3 6/9] virtio-ccw: implement synchronize_cbs()

On Thu, Apr 28, 2022 at 11:04:41AM +0800, Jason Wang wrote:
> > But my guess is that rwlock + some testing for the legacy indicator case
> > just to double check if there is a heavy regression despite of our
> > expectations to see none should do the trick.
> 
> I suggest this, rwlock (for not airq) seems better than spinlock, but
> at worst case it will cause cache line bouncing. But I wonder if it's
> noticeable (anyhow it has been used for airq).
> 
> Thanks

Which existing rwlock does airq use right now? Can we take it to sync?

-- 
MST