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Message-ID: <20160705062436.GE28164@bbox>
Date: Tue, 5 Jul 2016 15:24:36 +0900
From: Minchan Kim <minchan@...nel.org>
To: Mel Gorman <mgorman@...hsingularity.net>
CC: Andrew Morton <akpm@...ux-foundation.org>,
Linux-MM <linux-mm@...ck.org>, Rik van Riel <riel@...riel.com>,
Vlastimil Babka <vbabka@...e.cz>,
Johannes Weiner <hannes@...xchg.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 12/31] mm, vmscan: make shrink_node decisions more
node-centric
On Fri, Jul 01, 2016 at 09:01:20PM +0100, Mel Gorman wrote:
> Earlier patches focused on having direct reclaim and kswapd use data that
> is node-centric for reclaiming but shrink_node() itself still uses too
> much zone information. This patch removes unnecessary zone-based
> information with the most important decision being whether to continue
> reclaim or not. Some memcg APIs are adjusted as a result even though
> memcg itself still uses some zone information.
>
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> ---
> include/linux/memcontrol.h | 19 ++++++++--------
> include/linux/mmzone.h | 4 ++--
> include/linux/swap.h | 2 +-
> mm/memcontrol.c | 4 ++--
> mm/page_alloc.c | 2 +-
> mm/vmscan.c | 57 ++++++++++++++++++++++++++--------------------
> mm/workingset.c | 6 ++---
> 7 files changed, 51 insertions(+), 43 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 1927dcb6921e..48b43c709ed7 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -325,22 +325,23 @@ mem_cgroup_zone_zoneinfo(struct mem_cgroup *memcg, struct zone *zone)
> }
>
> /**
> - * mem_cgroup_zone_lruvec - get the lru list vector for a zone and memcg
> + * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
> + * @node: node of the wanted lruvec
> * @zone: zone of the wanted lruvec
> * @memcg: memcg of the wanted lruvec
> *
> - * Returns the lru list vector holding pages for the given @zone and
> - * @mem. This can be the global zone lruvec, if the memory controller
> + * Returns the lru list vector holding pages for a given @node or a given
> + * @memcg and @zone. This can be the node lruvec, if the memory controller
> * is disabled.
> */
> -static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
> - struct mem_cgroup *memcg)
> +static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
> + struct zone *zone, struct mem_cgroup *memcg)
> {
> struct mem_cgroup_per_zone *mz;
> struct lruvec *lruvec;
>
> if (mem_cgroup_disabled()) {
> - lruvec = zone_lruvec(zone);
> + lruvec = node_lruvec(pgdat);
> goto out;
> }
>
> @@ -610,10 +611,10 @@ static inline void mem_cgroup_migrate(struct page *old, struct page *new)
> {
> }
>
> -static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
> - struct mem_cgroup *memcg)
> +static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
> + struct zone *zone, struct mem_cgroup *memcg)
> {
> - return zone_lruvec(zone);
> + return node_lruvec(pgdat);
> }
>
> static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index eb74e63df5cf..f88cbbb476c8 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -739,9 +739,9 @@ static inline spinlock_t *zone_lru_lock(struct zone *zone)
> return &zone->zone_pgdat->lru_lock;
> }
>
> -static inline struct lruvec *zone_lruvec(struct zone *zone)
> +static inline struct lruvec *node_lruvec(struct pglist_data *pgdat)
> {
> - return &zone->zone_pgdat->lruvec;
> + return &pgdat->lruvec;
> }
>
> static inline unsigned long pgdat_end_pfn(pg_data_t *pgdat)
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index 916e2eddecd6..0ad616d7c381 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -316,7 +316,7 @@ extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
> unsigned long nr_pages,
> gfp_t gfp_mask,
> bool may_swap);
> -extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
> +extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem,
> gfp_t gfp_mask, bool noswap,
> struct zone *zone,
> unsigned long *nr_scanned);
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 50c86ad121bc..c9ebec98e92a 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -1432,8 +1432,8 @@ static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
> }
> continue;
> }
> - total += mem_cgroup_shrink_node_zone(victim, gfp_mask, false,
> - zone, &nr_scanned);
> + total += mem_cgroup_shrink_node(victim, gfp_mask, false,
> + zone, &nr_scanned);
> *total_scanned += nr_scanned;
> if (!soft_limit_excess(root_memcg))
> break;
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f58548139bf2..b76ea2527c09 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5954,6 +5954,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
> #endif
> pgdat_page_ext_init(pgdat);
> spin_lock_init(&pgdat->lru_lock);
> + lruvec_init(node_lruvec(pgdat));
>
> for (j = 0; j < MAX_NR_ZONES; j++) {
> struct zone *zone = pgdat->node_zones + j;
> @@ -6016,7 +6017,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
> /* For bootup, initialized properly in watermark setup */
> mod_zone_page_state(zone, NR_ALLOC_BATCH, zone->managed_pages);
>
> - lruvec_init(zone_lruvec(zone));
> if (!size)
> continue;
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 2f898ba2ee2e..b8e0f76b6e00 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2226,10 +2226,11 @@ static inline void init_tlb_ubc(void)
> /*
> * This is a basic per-zone page freer. Used by both kswapd and direct reclaim.
per-node freer
trivial:
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