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: <20121016135308.GA6958@barrios>
Date:	Tue, 16 Oct 2012 22:53:08 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oneukum@...e.de>,
	Jiri Kosina <jiri.kosina@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	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 Tue, Oct 16, 2012 at 09:47:03PM +0800, Ming Lei wrote:
> On Tue, Oct 16, 2012 at 9:09 PM, Minchan Kim <minchan@...nel.org> wrote:
> >
> > Good point. You can check it in __zone_reclaim and change gfp_mask of scan_control
> > because it's never hot path.
> >
> >>
> >> So could you make sure it is safe to move the branch into
> >> __alloc_pages_slowpath()?  If so, I will add the check into
> >> gfp_to_alloc_flags().
> >
> > How about this?
> 
> It is quite smart change, :-)
> 
> Considered that other part(sched.h) of the patch need update, I
> will merge your change into -v1 for further review with your
> Signed-off-by if you have no objection.

No problem. :)

-- 
Kind Regards,
Minchan Kim
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