linux-kernel - Re: [PATCH] block: Prevent hang

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Message-ID: <4C9CAD27.1030705@kernel.dk>
Date:	Fri, 24 Sep 2010 15:52:39 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Mark Lord <kernel@...savvy.com>
CC:	dgilbert@...erlog.com, Linux Kernel <linux-kernel@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Joel Becker <joel.becker@...cle.com>
Subject: Re: [PATCH] block: Prevent hang_check firing during long I/O

On 2010-09-24 15:51, Mark Lord wrote:
> During long I/O operations, the hang_check timer may fire,
> trigger stack dumps that unnecessarily alarm the user.
> 
> Eg.  hdparm --security-erase NULL /dev/sdb  ## can take *hours* to complete
> 
> So, if hang_check is armed, we should wake up periodically
> to prevent it from triggering.  This patch uses a wake-up interval
> equal to half the hang_check timer period, which keeps overhead low enough.

Applied, thanks.

-- 
Jens Axboe

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