linux-kernel - Re: [RFC PATCH v1.9 00/14] livepatch: hybrid consistency model

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Message-ID: <alpine.LNX.2.00.1604051617350.1180@pobox.suse.cz>
Date:	Tue, 5 Apr 2016 16:24:33 +0200 (CEST)
From:	Miroslav Benes <mbenes@...e.cz>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
cc:	Jiri Kosina <jikos@...nel.org>, Jessica Yu <jeyu@...hat.com>,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	Vojtech Pavlik <vojtech@...e.com>
Subject: Re: [RFC PATCH v1.9 00/14] livepatch: hybrid consistency model

On Mon, 4 Apr 2016, Josh Poimboeuf wrote:

> > I'd add a fake signal facility for sleeping non-migrated tasks. This 
> > would accelerate a migration to a new universe. We have it in kgraft for 
> > quite some time and it worked out great. See 
> > lkml.kernel.org/r/1430739625-4658-9-git-send-email-jslaby@...e.cz which 
> > went with Jiri's kgraft-on-klp patch set. See also Oleg's reply as it is 
> > important (I changed kgraft implementation according to that).
> 
> Ok, I'll look into sending a fake signal to remaining tasks.

Oh, do not worry about this one. I can prepare a patch once we discuss and 
review the rest. I think you have a lot on your plate even now.

There are several options how to do it. I think it would be nice not send 
a fake signal immediately. So we can...

1. do it after some time of waiting, or

2. we can have a knob in sysfs for an admin to send a fake signal if he 
does not want to wait anymore, or

3. (and this is crazy one) we can trace the progress of a migration and 
when there is none for several iterations we can send a signal

...

Miroslav