From: Mel Gorman <mel@csn.ul.ie>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org,
Chris Mason <chris.mason@oracle.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andi Kleen <andi@firstfloor.org>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 06/10] vmscan: Split shrink_zone to reduce stack usage
Date: Fri, 16 Apr 2010 15:27:25 +0100 [thread overview]
Message-ID: <20100416142725.GE19264@csn.ul.ie> (raw)
In-Reply-To: <20100416042308.GZ2493@dastard>
On Fri, Apr 16, 2010 at 02:23:08PM +1000, Dave Chinner wrote:
> On Thu, Apr 15, 2010 at 06:21:39PM +0100, Mel Gorman wrote:
> > shrink_zone() calculculates how many pages it needs to shrink from each
> > LRU list in a given pass. It uses a number of temporary variables to
> > work this out that then remain on the stack. This patch splits the
> > function so that some of the stack variables can be discarded.
> >
> > Signed-off-by: Mel Gorman <mel@csn.ul.ie>
> > ---
> > mm/vmscan.c | 29 +++++++++++++++++++----------
> > 1 files changed, 19 insertions(+), 10 deletions(-)
> >
> > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > index 1ace7c6..a374879 100644
> > --- a/mm/vmscan.c
> > +++ b/mm/vmscan.c
> > @@ -1595,19 +1595,14 @@ static unsigned long nr_scan_try_batch(unsigned long nr_to_scan,
> > return nr;
> > }
> >
> > -/*
> > - * This is a basic per-zone page freer. Used by both kswapd and direct reclaim.
> > - */
> > -static void shrink_zone(struct zone *zone, struct scan_control *sc)
> > +/* Calculate how many pages from each LRU list should be scanned */
> > +static void calc_scan_trybatch(struct zone *zone,
> > + struct scan_control *sc, unsigned long *nr)
>
> Needs "noinline_for_stack" to stop the compiler re-inlining it.
>
Agreed. I was using noinline where I spotted the compiler automatically
inlined but noinline_for_stack both handles future compiler changes and
is self-documenting. Thanks
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
next prev parent reply other threads:[~2010-04-16 14:27 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-15 17:21 [RFC PATCH 00/10] Reduce stack usage used by page reclaim V1 Mel Gorman
2010-04-15 17:21 ` [PATCH 01/10] vmscan: kill prev_priority completely Mel Gorman
2010-04-16 22:37 ` Johannes Weiner
2010-04-15 17:21 ` [PATCH 02/10] vmscan: move priority variable into scan_control Mel Gorman
2010-04-16 22:48 ` Johannes Weiner
2010-05-26 10:23 ` Mel Gorman
2010-05-28 2:39 ` KOSAKI Motohiro
2010-04-15 17:21 ` [PATCH 03/10] vmscan: simplify shrink_inactive_list() Mel Gorman
2010-04-16 22:54 ` Johannes Weiner
2010-04-15 17:21 ` [PATCH 04/10] vmscan: Remove useless loop at end of do_try_to_free_pages Mel Gorman
2010-04-16 2:48 ` KOSAKI Motohiro
2010-04-16 22:56 ` Johannes Weiner
2010-04-15 17:21 ` [PATCH 05/10] vmscan: Remove unnecessary temporary vars in do_try_to_free_pages Mel Gorman
2010-04-16 2:47 ` KOSAKI Motohiro
2010-04-15 17:21 ` [PATCH 06/10] vmscan: Split shrink_zone to reduce stack usage Mel Gorman
2010-04-16 4:23 ` Dave Chinner
2010-04-16 14:27 ` Mel Gorman [this message]
2010-04-16 6:26 ` KOSAKI Motohiro
2010-04-16 23:14 ` Johannes Weiner
2010-04-15 17:21 ` [PATCH 07/10] vmscan: Remove unnecessary temporary variables in shrink_zone() Mel Gorman
2010-04-16 2:51 ` KOSAKI Motohiro
2010-04-16 23:03 ` Johannes Weiner
2010-05-26 11:21 ` Mel Gorman
2010-05-28 2:51 ` KOSAKI Motohiro
2010-04-15 17:21 ` [PATCH 08/10] vmscan: Setup pagevec as late as possible in shrink_inactive_list() Mel Gorman
2010-04-16 4:27 ` Dave Chinner
2010-04-16 6:30 ` KOSAKI Motohiro
2010-04-16 14:31 ` Mel Gorman
2010-04-16 23:28 ` Johannes Weiner
2010-04-15 17:21 ` [PATCH 09/10] vmscan: Setup pagevec as late as possible in shrink_page_list() Mel Gorman
2010-04-16 7:54 ` KOSAKI Motohiro
2010-04-16 14:34 ` Mel Gorman
2010-04-15 17:21 ` [PATCH 10/10] vmscan: Update isolated page counters outside of main path in shrink_inactive_list() Mel Gorman
2010-04-16 11:19 ` KOSAKI Motohiro
2010-04-16 14:35 ` Mel Gorman
2010-04-16 23:34 ` Johannes Weiner
2010-04-16 14:50 ` [RFC PATCH 00/10] Reduce stack usage used by page reclaim V1 Mel Gorman
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