On Tue, 30 Nov 2010 15:46:31 +0530 Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> wrote: > Provide control using zone_reclaim() and a boot parameter. The > code reuses functionality from zone_reclaim() to isolate unmapped > pages and reclaim them as a priority, ahead of other mapped pages. > > Signed-off-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> > --- > include/linux/swap.h | 5 ++- > mm/page_alloc.c | 7 +++-- > mm/vmscan.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++- > 3 files changed, 79 insertions(+), 5 deletions(-) > > diff --git a/include/linux/swap.h b/include/linux/swap.h > index eba53e7..78b0830 100644 > --- a/include/linux/swap.h > +++ b/include/linux/swap.h > @@ -252,11 +252,12 @@ extern int vm_swappiness; > extern int remove_mapping(struct address_space *mapping, struct page *page); > extern long vm_total_pages; > > -#ifdef CONFIG_NUMA > -extern int zone_reclaim_mode; > extern int sysctl_min_unmapped_ratio; > extern int sysctl_min_slab_ratio; > extern int zone_reclaim(struct zone *, gfp_t, unsigned int); > +extern bool should_balance_unmapped_pages(struct zone *zone); > +#ifdef CONFIG_NUMA > +extern int zone_reclaim_mode; > #else > #define zone_reclaim_mode 0 > static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order) > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 62b7280..4228da3 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -1662,6 +1662,9 @@ zonelist_scan: > unsigned long mark; > int ret; > > + if (should_balance_unmapped_pages(zone)) > + wakeup_kswapd(zone, order); > + Hm, I'm not sure the final vision of this feature. Does this reclaiming feature can't be called directly via balloon driver just before alloc_page() ? Do you need to keep page caches small even when there are free memory on host ? Thanks, -Kame -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
