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From: Petr Mladek <pmladek@suse.com>
To: Miroslav Benes <mbenes@suse.cz>
Cc: jpoimboe@redhat.com, jeyu@kernel.org, jikos@kernel.org,
	lpechacek@suse.cz, pavel@ucw.cz, live-patching@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 2/2] livepatch: force transition process to finish
Date: Wed, 1 Nov 2017 16:32:04 +0100	[thread overview]
Message-ID: <20171101153204.GH20040@pathway.suse.cz> (raw)
In-Reply-To: <20171031114853.841-3-mbenes@suse.cz>

On Tue 2017-10-31 12:48:53, Miroslav Benes wrote:
> If a task sleeps in a set of patched functions uninterruptedly, it could
> block the whole transition process indefinitely.  Thus it may be useful
> to clear its TIF_PATCH_PENDING to allow the process to finish.
> 
> Admin can do that now by writing to force sysfs attribute in livepatch
> sysfs directory. TIF_PATCH_PENDING is then cleared for all tasks and the
> transition can finish successfully.
> 
> Important note! Use wisely. Admin must be sure that it is safe to
> execute such action. This means that it must be checked that by doing so
> the consistency model guarantees are not violated.
> 
> Signed-off-by: Miroslav Benes <mbenes@suse.cz>

If no animals were harmed when developing this brute force then
feel free to use:

Reviewed-by: Petr Mladek <pmladek@suse.com>

Best Regards,
Petr

  reply	other threads:[~2017-11-01 15:32 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-31 11:48 [PATCH v3 0/2] livepatch: Introduce signal and force sysfs attributes Miroslav Benes
2017-10-31 11:48 ` [PATCH v3 1/2] livepatch: send a fake signal to all blocking tasks Miroslav Benes
2017-11-01 15:06   ` Miroslav Benes
2017-11-01 15:13   ` Petr Mladek
2017-11-01 16:43     ` Oleg Nesterov
2017-11-02 10:36       ` Miroslav Benes
2017-11-02 14:08         ` Oleg Nesterov
2017-11-02 13:09   ` Josh Poimboeuf
2017-11-03  8:02     ` Miroslav Benes
2017-11-03 12:57       ` Josh Poimboeuf
2017-11-02 13:32   ` Josh Poimboeuf
2017-11-03  8:06     ` Miroslav Benes
2017-11-06 11:08   ` Pavel Machek
2017-10-31 11:48 ` [PATCH v3 2/2] livepatch: force transition process to finish Miroslav Benes
2017-11-01 15:32   ` Petr Mladek [this message]
2017-11-02 13:13   ` Josh Poimboeuf
2017-11-03  8:07     ` Miroslav Benes
2017-11-06 11:11   ` Pavel Machek
2017-11-06 12:03     ` Jiri Kosina
2017-11-09 11:14       ` Pavel Machek

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