linux-kernel - Re: [RFC][PATCH] vhost/vsock: Add vsock_list file to map cid with vhost tasks

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Date:   Wed, 5 May 2021 21:03:16 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Joel Fernandes <joelaf@...gle.com>,
        Linux Trace Devel <linux-trace-devel@...r.kernel.org>
Subject: Re: [RFC][PATCH] vhost/vsock: Add vsock_list file to map cid with
 vhost tasks

For kicks, I wrote this program that uses libtracefs to search all CIDS
(1-255), and find the kvm guests that are attached to them.

It traces the sched_wakeup and kvm_exit, looking for:

 this_task -> wakeup -> wakeup -> kvm_exit

when doing a connect to a cid.

When it finds the pid that did a kvm_exit, it knows that's the PID that
is woken by the vhost worker task. It's a little slow, and I would
really like a better way to do this, but it's at least an option that
is available now.

-- Steve

View attachment "vsock-list.c" of type "text/x-c++src" (5306 bytes)