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

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Date:	Tue, 09 Sep 2014 16:01:32 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	Tejun Heo <tj@...nel.org>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Lennart Poettering <lennart@...ttering.net>,
	Kay Sievers <kay@...y.org>,
	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>,
	Cas ey 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

On Tuesday, September 09, 2014 03:46:23 PM James Bottomley wrote:
> On Wed, 2014-09-10 at 07:41 +0900, Tejun Heo wrote:
> > 
> > The thing is that we have to have dynamic mechanism to listen for
> > device attachments no matter what and such mechanism has been in place
> > for a long time at this point.  The synchronous wait simply doesn't
> > serve any purpose anymore and kinda gets in the way in that it makes
> > it a possibly extremely slow process to tell whether loading of a
> > module succeeded or not because the wait for the initial round of
> > probe is piggybacked.
> 
> OK, so we just fire and forget in userland ... why bother inventing an
> elaborate new infrastructure in the kernel to do exactly what
> 
> modprobe <mod> &
> 
> would do?

Just so we do not forget: we also want the no-modules case to also be able
to probe asynchronously so that a slow device does not stall kernel booting.

Thanks.

-- 
Dmitry
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