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@xxxxxxxxx> > > --- > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
