linux-kernel - Re: [PATCH] virtiofs: Enable multiple request queues

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Message-ID: <YJpbEMePhQ88EWWR@stefanha-x1.localdomain>
Date:   Tue, 11 May 2021 11:23:12 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Connor Kuehl <ckuehl@...hat.com>
Cc:     virtio-fs@...hat.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Miklos Szeredi <miklos@...redi.hu>,
        Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH] virtiofs: Enable multiple request queues

On Fri, May 07, 2021 at 05:15:27PM -0500, Connor Kuehl wrote:
> @@ -1245,7 +1262,8 @@ __releases(fiq->lock)
>  		 req->in.h.nodeid, req->in.h.len,
>  		 fuse_len_args(req->args->out_numargs, req->args->out_args));
>  
> -	fsvq = &fs->vqs[queue_id];
> +	fsvq = this_cpu_read(this_cpu_fsvq);

Please check how CPU hotplug affects this patch. If the current CPU
doesn't have a vq because it was hotplugged, then it may be necessary to
pick another vq.

Stefan

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