On Tue, Mar 19, 2013 at 07:58:51AM +0800, Simon Jeons wrote:
> >@@ -2672,26 +2677,25 @@ static void kswapd_shrink_zone(struct zone *zone,
> > static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
> > int *classzone_idx)
> > {
> >- bool pgdat_is_balanced = false;
> > int i;
> > int end_zone = 0; /* Inclusive. 0 = ZONE_DMA */
> > unsigned long nr_soft_reclaimed;
> > unsigned long nr_soft_scanned;
> > struct scan_control sc = {
> > .gfp_mask = GFP_KERNEL,
> >+ .priority = DEF_PRIORITY,
> > .may_unmap = 1,
> > .may_swap = 1,
> >+ .may_writepage = !laptop_mode,
>
> What's the influence of this change? If there are large numbers of
> anonymous pages and very little file pages, anonymous pages will not
> be swapped out when priorty >= DEF_PRIORITY-2. Just no sense scan.
None. The initialisation just moves from where it was after the
loop_again label to here. See the next hunk.
> > .order = order,
> > .target_mem_cgroup = NULL,
> > };
> >-loop_again:
> >- sc.priority = DEF_PRIORITY;
> >- sc.nr_reclaimed = 0;
> >- sc.may_writepage = !laptop_mode;
> > count_vm_event(PAGEOUTRUN);
> > do {
> > unsigned long lru_pages = 0;
> >+ unsigned long nr_reclaimed = sc.nr_reclaimed;
> >+ bool raise_priority = true;
> > /*
> > * Scan in the highmem->dma direction for the highest
--
Mel Gorman
SUSE Labs
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