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

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Message-ID: <20160406081557.GD18968@pathway.suse.cz>
Date:	Wed, 6 Apr 2016 10:15:57 +0200
From:	Petr Mladek <pmladek@...e.com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Jiri Kosina <jikos@...nel.org>, Jessica Yu <jeyu@...hat.com>,
	Miroslav Benes <mbenes@...e.cz>, 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 Tue 2016-04-05 08:44:30, Josh Poimboeuf wrote:
> On Fri, Apr 01, 2016 at 03:39:44PM +0200, Petr Mladek wrote:
> > On Fri 2016-03-25 14:34:47, Josh Poimboeuf wrote:
> > > - update documentation for sysfs, proc, livepatch
> > 
> > Also we should publish somewhere the information about TIF_KLP_NEED_UPDATE
> > flag, e.g. /proc/<pid>/klp_need_update. It is handy to see what
> > process blocks the transition. We have something similar in
> > kGraft, see in_progress_show() at
> > https://git.kernel.org/cgit/linux/kernel/git/jirislaby/kgraft.git/commit/?h=kgraft-4.4&id=1c82fbd7b1fe240f4ed178a6506a93033f6a4bed
> 
> Patch 13/14 exposes the per-task patched state in /proc, so I think that
> already does what you're asking for?  It doesn't expose
> TIF_KLP_NEED_UPDATE, but that's more of an internal detail I think.

Heh, I have missed it. Yup, the per-thread patch state info seems to
be enough.

Best Regards,
Petr