linux-kernel - Re: [PATCH 1/3] virtio-crypto: fixup potential cpu stall when free unused bufs

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Date:   Sat, 10 Jun 2023 08:51:02 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Xianting Tian <xianting.tian@...ux.alibaba.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>, arei.gonglei@...wei.com,
        jasowang@...hat.com, xuanzhuo@...ux.alibaba.com,
        herbert@...dor.apana.org.au, davem@...emloft.net, amit@...nel.org,
        arnd@...db.de, marcel@...tmann.org, johan.hedberg@...il.com,
        luiz.dentz@...il.com, linux-bluetooth@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xianting Tian <tianxianting.txt@...baba-inc.com>
Subject: Re: [PATCH 1/3] virtio-crypto: fixup potential cpu stall when free
 unused bufs

On Sat, Jun 10, 2023 at 11:20:49AM +0800, Xianting Tian wrote:
> 
> 在 2023/6/9 下午11:57, Michael S. Tsirkin 写道:
> > On Fri, Jun 09, 2023 at 09:18:15PM +0800, Xianting Tian wrote:
> > > From: Xianting Tian <tianxianting.txt@...baba-inc.com>
> > > 
> > > Cpu stall issue may happen if device is configured with multi queues
> > > and large queue depth, so fix it.
> > What does "may happen" imply exactly?
> > was this observed?
> I didn't met such issue, this patch set just a theoretical fix.

Then I would not recommend adding it at this time, as you just slowed
down the kernel for something that no one has reported :(

thanks,

greg k-h