linux-kernel - Re: [PATCH v6 2/6] PM / Runtime: introduce pm_runtime_set_memalloc

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Message-ID: <CACVXFVODD9fRqQc3kR58OJm3ERgBWojnx=790xGwu=MPGaSmMA@mail.gmail.com>
Date:	Wed, 28 Nov 2012 12:34:36 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oneukum@...e.de>,
	Minchan Kim <minchan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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-mm@...ck.org
Subject: Re: [PATCH v6 2/6] PM / Runtime: introduce pm_runtime_set_memalloc_noio()

On Wed, Nov 28, 2012 at 5:19 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>
> Please use counters instead of walking the whole path every time.  Ie. in
> addition to the flag add a counter to store the number of the device's
> children having that flag set.

Even though counter is added, walking the whole path can't be avoided too,
and may be a explicit walking or recursion, because pm_runtime_set_memalloc_noio
is required to set or clear the flag(or increase/decrease the counter) of
devices in the whole path.

Thanks,
--
Ming Lei
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