linux-kernel - Re: [PATCH v6 0/4] block layer runtime pm

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Message-ID: <Pine.LNX.4.44L0.1301081024300.1535-100000@iolanthe.rowland.org>
Date:	Tue, 8 Jan 2013 10:27:54 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Aaron Lu <aaron.lu@...el.com>
cc:	Jens Axboe <axboe@...nel.dk>, "Rafael J. Wysocki" <rjw@...k.pl>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	<linux-pm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Aaron Lu <aaron.lwe@...il.com>,
	Shane Huang <shane.huang@....com>
Subject: Re: [PATCH v6 0/4] block layer runtime pm

On Tue, 8 Jan 2013, Aaron Lu wrote:

> So this also reminds me that as long as CONFIG_PM_RUNTIME is selected,
> the blk_pm_add/put/peek_request functions will be in the block IO path.
> Shall we introduce a new config option to selectively build block
> runtime PM functionality? something like CONFIG_BLK_PM_RUNTIME perhaps?
> 
> Just some condition checks in those functions, not sure if it is worth a
> new config though. Please suggest, thanks.

I don't think it is needed.  The new routines will be very quick when 
blk_pm_runtime_init() hasn't been called, once you add back the checks 
for the queue's device.

Alan Stern

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