On 06/09/2016 08:04 PM, Mel Gorman wrote: > Node-based reclaim requires node-based LRUs and locking. This is a > preparation patch that just moves the lru_lock to the node so later patches > are easier to review. It is a mechanical change but note this patch makes > contention worse because the LRU lock is hotter and direct reclaim and kswapd > can contend on the same lock even when reclaiming from different zones. > > Signed-off-by: Mel Gorman <mgor...@techsingularity.net> > Acked-by: Johannes Weiner <han...@cmpxchg.org>
Acked-by: Vlastimil Babka <vba...@suse.cz> One thing... > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 9d71af25acf9..1e0ad06c33bd 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -5944,10 +5944,10 @@ static void __paginginit free_area_init_core(struct > pglist_data *pgdat) > zone->min_slab_pages = (freesize * sysctl_min_slab_ratio) / 100; > #endif > zone->name = zone_names[j]; > + zone->zone_pgdat = pgdat; > spin_lock_init(&zone->lock); > - spin_lock_init(&zone->lru_lock); > + spin_lock_init(zone_lru_lock(zone)); This means the same lock will be inited MAX_NR_ZONES times. Peterz told me it's valid but weird. Probably better to do it just once, in case lockdep/lock debugging gains some checks for that? > zone_seqlock_init(zone); > - zone->zone_pgdat = pgdat; > zone_pcp_init(zone); > > /* For bootup, initialized properly in watermark setup */
