netdev - Re: [RFC v2 3/6] kthread: warn on kill signal if not OOM

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Date:	Tue, 9 Sep 2014 10:10:59 +0900
From:	Tejun Heo <tj@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	Lennart Poettering <lennart@...ttering.net>,
	Kay Sievers <kay@...y.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Wu Zhangjin <falcon@...zu.com>, Takashi Iwai <tiwai@...e.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>, hare@...e.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Joseph Salisbury <joseph.salisbury@...onical.com>,
	Benjamin Poirier <bpoirier@...e.de>,
	Santosh Rastapur <santosh@...lsio.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tim Gardner <tim.gardner@...onical.com>,
	Pierre Fersing <pierre-fersing@...rref.org>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	Casey Leedom <leedom@...lsio.com>,
	Hariprasad S <hariprasad@...lsio.com>,
	MPT-FusionLinux.pdl@...gotech.com,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC v2 3/6] kthread: warn on kill signal if not OOM

Hello, Luis.

On Mon, Sep 08, 2014 at 06:04:23PM -0700, Luis R. Rodriguez wrote:
> > I have no idea how the selection should be.  It could be per-insmod or
> > maybe just a system-wide flag with explicit exceptions marked on
> > drivers is good enough.  I don't know.
> 
> Its perfectly understandable if we don't know what path to take yet
> and its also understandable for it to take time to figure out --
> meanwhile though systemd already has merged a policy of a 30 second
> timeout for *all drivers* though so we therefore need:

I'm not too convinced this is such a difficult problem to figure out.
We already have most of logic in place and the only thing missing is
how to switch it.  Wouldn't something like the following work?

* Add a sysctl knob to enable asynchronous device probing on module
  load and enable asynchronous probing globally if the knob is set.

* Identify cases which can't be asynchronous and make them
  synchronous.  e.g. keep who's doing request_module() and avoid
  asynchronous probing if current is probing one of those.

Thanks.

-- 
tejun
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