linux-kernel - Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc

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Message-ID: <CACVXFVMTg6k09AWTDZKQCJTBTUGwQ0OoHhdCLFdcbbCv5kzTjw@mail.gmail.com>
Date:	Tue, 30 Oct 2012 19:30:14 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, Minchan Kim <minchan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Jens Axboe <axboe@...nel.dk>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc_noio()

Hi,

On Tue, Oct 30, 2012 at 6:57 PM, Oliver Neukum <oneukum@...e.de> wrote:
> how is this to work with power management domains?

Could you explain it in a bit detail? Why is PM domain involved?

Suppose PM domain is involved, its domain runtime_resume callback
is still run in the context with PF_MEMALLOC_NOIO flag set if the
affected 'device' is passed to the callback.

> And I may be dense, but disks are added in slave_configure().
> This seems to be a race to me.

Sorry, could you describe what is the race?

Suppose drivers set correct parent device to the disk device(gendisk),
then add the disk into device model via register_disk(), the solution
should be fine.

Thanks,
--
Ming Lei
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