linux-kernel - Re: [RFC PATCH 1/3] mm: teach mm by current context info to not do I/O during memory allocation

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Message-ID: <CACVXFVM=nNEthvSOzoTnoZ-7uhLGGmZ8ULsPu0N0d8QegtHYew@mail.gmail.com>
Date:	Mon, 15 Oct 2012 22:41:48 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
	Oliver Neukum <oneukum@...e.de>,
	Jiri Kosina <jiri.kosina@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC PATCH 1/3] mm: teach mm by current context info to not do
 I/O during memory allocation

On Mon, Oct 15, 2012 at 10:33 PM, Alan Stern <stern@...land.harvard.edu> wrote:
>
> Instead of allow/forbid, the API should be save/restore (like
> local_irq_save and local_irq_restore).  This makes nesting much easier.

Good point.

> Also, do we really the "p" argument?  This is not at all likely to be
> used with any task other than the current one.

Yes, only 'current' can be passed now. I keep it because no performance
effect with macro implementation. But that is not good since it may
cause misuse. Will remove the 'p' argument.

Thanks,
--
Ming Lei
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