linux-kernel - Re: [RFC PATCHv2] usb: move hub init and LED blink work to power efficient workqueue

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Date:	Sun, 2 Feb 2014 11:10:13 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Zoran Markovic <zoran.markovic@...aro.org>
cc:	linux-kernel@...r.kernel.org, <linux-usb@...r.kernel.org>,
	Shaibal Dutta <shaibal.dutta@...adcom.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Xenia Ragiadakou <burzalodowa@...il.com>,
	Julius Werner <jwerner@...omium.org>,
	Krzysztof Mazur <krzysiek@...lesie.net>,
	Matthias Beyer <mail@...ermatthias.de>,
	Dan Williams <dan.j.williams@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Thomas Pugliese <thomas.pugliese@...il.com>
Subject: Re: [RFC PATCHv2] usb: move hub init and LED blink work to power
 efficient workqueue

On Sat, 1 Feb 2014, Zoran Markovic wrote:

> From: Shaibal Dutta <shaibal.dutta@...adcom.com>
> 
> Allow the scheduler to select the best CPU to handle hub initalization
> and LED blinking work. This extends idle residency times on idle CPUs
> and conserves power.
> 
> This functionality is enabled when CONFIG_WQ_POWER_EFFICIENT is selected.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
> Cc: Xenia Ragiadakou <burzalodowa@...il.com>
> Cc: Julius Werner <jwerner@...omium.org>
> Cc: Krzysztof Mazur <krzysiek@...lesie.net>
> Cc: Matthias Beyer <mail@...ermatthias.de>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Mathias Nyman <mathias.nyman@...ux.intel.com>
> Cc: Thomas Pugliese <thomas.pugliese@...il.com>
> Signed-off-by: Shaibal Dutta <shaibal.dutta@...adcom.com>
> [zoran.markovic@...aro.org: Rebased to latest kernel. Added commit message.
> Changed reference from system to power efficient workqueue for LEDs in
> check_highspeed() and hub_port_connect_change().]
> Signed-off-by: Zoran Markovic <zoran.markovic@...aro.org>

Acked-off-by: Alan Stern <stern@...land.harvard.edu>

Is there some reason why schedule_delayed_work() doesn't use the 
power-efficient work queue by default?

Alan Stern

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