From: Johannes Berg <johannes@sipsolutions.net>
To: Hajime Tazaki <thehajime@gmail.com>
Cc: linux-um@lists.infradead.org
Subject: Re: [PATCH 4/6] um: implement time-travel=ext
Date: Thu, 13 Feb 2020 16:52:39 +0100 [thread overview]
Message-ID: <e3073fbe7298451467a3a484efad90611df19c9e.camel@sipsolutions.net> (raw)
In-Reply-To: <m2h7zuwpao.wl-thehajime@gmail.com> (sfid-20200213_151101_494563_49D1F81B)
Hi,
> > The protocol for the unix domain socket is defined in the new file
> > include/uapi/linux/um_timetravel.h.
>
> I was wondering if the source code of the special application (central
> scheduler?) is public (or not) so that we can test on a local machine.
So ... sadly, it's a bit of a sad story right now.
I have one, but it's part of a bigger testing framework that we wrote
(and uses the infrastructure from it), that I haven't been able to
release so far.
On this tool, conceptually, the code is very simple, just keep a sorted
"next event" list, and tell the next one that it's their turn.
For a vhost-user device implementation, it's a bit more complex, as it
needs to be able to handle scheduler messages while waiting for a vhost-
user ACK message, similar to what you can see in the UML vhost-user
code.
johannes
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next prev parent reply other threads:[~2020-02-13 15:52 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 13:26 [PATCH 0/6] um: external time travel Johannes Berg
2020-02-13 13:26 ` [PATCH 1/6] um: move timer-internal.h to non-shared Johannes Berg
2020-02-13 13:26 ` [PATCH 2/6] um: time-travel: rewrite as an event scheduler Johannes Berg
2020-02-13 13:26 ` [PATCH 3/6] um: virtio: implement VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS Johannes Berg
2020-02-13 13:26 ` [PATCH 4/6] um: implement time-travel=ext Johannes Berg
2020-02-13 14:10 ` Hajime Tazaki
2020-02-13 15:52 ` Johannes Berg [this message]
2020-02-14 5:34 ` Hajime Tazaki
2020-02-14 8:14 ` Johannes Berg
2020-02-13 13:26 ` [PATCH 5/6] um: implement ndelay/udelay in time-travel mode Johannes Berg
2020-02-13 13:26 ` [PATCH 6/6] um: implement cpu_relax() as ndelay(1) for time-travel Johannes Berg
2020-03-29 21:48 ` [PATCH 0/6] um: external time travel Richard Weinberger
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