linux-kernel - Re: [RFC PATCH v2 4/6] net/core: apply pm_runtime_set_memalloc

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Message-ID: <CACVXFVMzwUAmPn2rsALGTRcBN2w2MSVsbAMmJK4Pb_Cs5ksDcA@mail.gmail.com>
Date:	Tue, 23 Oct 2012 16:42:02 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org, Oliver Neukum <oneukum@...e.de>,
	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,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Decotigny <david.decotigny@...gle.com>,
	Tom Herbert <therbert@...gle.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC PATCH v2 4/6] net/core: apply pm_runtime_set_memalloc_noio
 on network devices

On Tue, Oct 23, 2012 at 3:18 AM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Mon, 22 Oct 2012, Ming Lei wrote:

> Is this really needed?  Even with iSCSI, doesn't register_disk() have
> to be called for the underlying block device?  And given your 3/6
> patch, wouldn't that mark the network device?

The problem is that network device is not one ancestor of the
iSCSI disk device, which transfers data over tcp stack.


Thanks,
--
Ming Lei
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