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

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Message-ID: <541022F4.4020501@crashplan.pro>
Date:	Wed, 10 Sep 2014 12:07:48 +0200
From:	Ceriel Jacobs <linux-scsi@...shplan.pro>
To:	Tom Gundersen <teg@...m.no>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
CC:	James Bottomley <James.Bottomley@...senpartnership.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Takashi Iwai <tiwai@...e.de>, Kay Sievers <kay@...y.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	hare <hare@...e.com>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Wu Zhangjin <falcon@...zu.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	"mpt-fusionlinux.pdl" <MPT-FusionLinux.pdl@...gotech.com>,
	Tim Gardner <tim.gardner@...onical.com>,
	Benjamin Poirier <bpoirier@...e.de>,
	Santosh Rastapur <santosh@...lsio.com>,
	Casey Leedom <leedom@...lsio.com>,
	Hariprasad S <hariprasad@...lsio.com>,
	Pierre Fersing <pierre-fersing@...rref.org>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	systemd Mailing List <systemd-devel@...ts.freedesktop.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joseph Salisbury <joseph.salisbury@...onical.com>
Subject: Re: [systemd-devel] [RFC v2 3/6] kthread: warn on kill signal if
 not OOM

Tom Gundersen schreef op 10-09-14 om 08:46:
>> >Indeed. What I proposed with a multiplier for the timeout for the
>> >different types of built in commands was deemed complex but saw no
>> >alternatives proposed despite my interest to work on one and
>> >clarifications noted that this was a design regression. Not quite sure
>> >what else I could have done here. I'm interested in learning what the
>> >better approach is for the future as if we want to marry init + kernel
>> >we need a smooth way for us to discuss design without getting worked
>> >up about it, or taking it personal. I really want this to work as I
>> >personally like systemd so far.
> How about this: keep the timeout global, but also introduce a
> (relatively short, say 10 or 15 seconds) timeout after which a warning
> is printed. Even if nothing is actually killed, having workers (be it
> insmod or something else) take longer than a couple of seconds is
> likely a sign that something is seriously off somewhere.

I don't agree with the statement that something is seriously off when it 
takes more then 10 to 15 seconds.

When probing only one hard disk drive, then I do agree that something is 
seriously off after 10 to 15 seconds.

When probing a SAS bus with one hundred hard disk drives in standby 
mode, then I do expect that to take longer then 10 to 15 seconds.
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