linux-kernel - Re: [PATCH 1/2] vdpa: mlx5: prevent cvq work from hogging CPU

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Message-ID: <CACGkMEt-PRCsBQ+EJVGeWGikJfLk-0M1dRPMqnp9YC5R4HYAjQ@mail.gmail.com>
Date:   Tue, 22 Mar 2022 09:59:14 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     mst <mst@...hat.com>, Eli Cohen <elic@...dia.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] vdpa: mlx5: prevent cvq work from hogging CPU

On Mon, Mar 21, 2022 at 8:34 PM Hillf Danton <hdanton@...a.com> wrote:
>
> On Mon, 21 Mar 2022 17:00:09 +0800 Jason Wang wrote:
> >
> > Ok, speak too fast.
>
> Frankly I have fun running faster five days a week.

:)

>
> > So you meant to add a cond_resched() in the loop?
>
> Yes, it is one liner.

Yes, there will be no "infinite" loop, but since the loop is triggered
by userspace. It looks to me it will delay the flush/drain of the
workqueue forever which is still suboptimal.

Thanks

>
> Hillf
>