> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 98fc7ed..3370c5a 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1526,6 +1526,7 @@ struct task_struct {
> struct mem_cgroup *memcg; /* target memcg of uncharge */
> unsigned long nr_pages; /* uncharged usage */
> unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
> + struct zone *zone; /* a zone page is last uncharged */
"zone" is bad name for task_struct. :-/
> } memcg_batch;
> #endif
> };
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index a062f0b..b868e597 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -159,6 +159,8 @@ enum {
> SWP_SCANNING = (1 << 8), /* refcount in scan_swap_map */
> };
>
> +#define ZONE_RECLAIMABLE_RATE 6
> +
Need comment?
> #define SWAP_CLUSTER_MAX 32
> #define COMPACT_CLUSTER_MAX SWAP_CLUSTER_MAX
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 41eaa62..9e535b2 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -135,7 +135,10 @@ struct mem_cgroup_per_zone {
> bool on_tree;
> struct mem_cgroup *mem; /* Back pointer, we cannot */
> /* use container_of */
> + unsigned long pages_scanned; /* since last reclaim */
> + bool all_unreclaimable; /* All pages pinned */
> };
> +
> /* Macro for accessing counter */
> #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)])
>
> @@ -1162,6 +1165,103 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page)
> return &mz->reclaim_stat;
> }
>
> +void mem_cgroup_mz_pages_scanned(struct mem_cgroup *mem, struct zone *zone,
> + unsigned long nr_scanned)
this names sound like pages_scanned value getting helper function.
> +{
> + struct mem_cgroup_per_zone *mz = NULL;
> + int nid = zone_to_nid(zone);
> + int zid = zone_idx(zone);
> +
> + if (!mem)
> + return;
> +
> + mz = mem_cgroup_zoneinfo(mem, nid, zid);
> + if (mz)
> + mz->pages_scanned += nr_scanned;
> +}
> +
> +bool mem_cgroup_zone_reclaimable(struct mem_cgroup *mem, struct zone *zone)
> +{
> + struct mem_cgroup_per_zone *mz = NULL;
> + int nid = zone_to_nid(zone);
> + int zid = zone_idx(zone);
> +
> + if (!mem)
> + return 0;
> +
> + mz = mem_cgroup_zoneinfo(mem, nid, zid);
> + if (mz)
> + return mz->pages_scanned <
> + mem_cgroup_zone_reclaimable_pages(mem, zone) *
> + ZONE_RECLAIMABLE_RATE;
> + return 0;
> +}
> +
> +bool mem_cgroup_mz_unreclaimable(struct mem_cgroup *mem, struct zone *zone)
> +{
> + struct mem_cgroup_per_zone *mz = NULL;
> + int nid = zone_to_nid(zone);
> + int zid = zone_idx(zone);
> +
> + if (!mem)
> + return false;
> +
> + mz = mem_cgroup_zoneinfo(mem, nid, zid);
> + if (mz)
> + return mz->all_unreclaimable;
> +
> + return false;
> +}
> +
> +void mem_cgroup_mz_set_unreclaimable(struct mem_cgroup *mem, struct zone *zone)
> +{
> + struct mem_cgroup_per_zone *mz = NULL;
> + int nid = zone_to_nid(zone);
> + int zid = zone_idx(zone);
> +
> + if (!mem)
> + return;
> +
> + mz = mem_cgroup_zoneinfo(mem, nid, zid);
> + if (mz)
> + mz->all_unreclaimable = true;
> +}
> +
> +void mem_cgroup_mz_clear_unreclaimable(struct mem_cgroup *mem,
> + struct zone *zone)
> +{
> + struct mem_cgroup_per_zone *mz = NULL;
> + int nid = zone_to_nid(zone);
> + int zid = zone_idx(zone);
> +
> + if (!mem)
> + return;
> +
> + mz = mem_cgroup_zoneinfo(mem, nid, zid);
> + if (mz) {
> + mz->pages_scanned = 0;
> + mz->all_unreclaimable = false;
> + }
> +
> + return;
> +}
> +
> +void mem_cgroup_clear_unreclaimable(struct mem_cgroup *mem, struct page *page)
> +{
> + struct mem_cgroup_per_zone *mz = NULL;
> +
> + if (!mem)
> + return;
> +
> + mz = page_cgroup_zoneinfo(mem, page);
> + if (mz) {
> + mz->pages_scanned = 0;
> + mz->all_unreclaimable = false;
> + }
> +
> + return;
> +}
> +
> unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
> struct list_head *dst,
> unsigned long *scanned, int order,
> @@ -2709,6 +2809,7 @@ void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem)
>
> static void mem_cgroup_do_uncharge(struct mem_cgroup *mem,
> unsigned int nr_pages,
> + struct page *page,
> const enum charge_type ctype)
> {
> struct memcg_batch_info *batch = NULL;
> @@ -2726,6 +2827,10 @@ static void mem_cgroup_do_uncharge(struct mem_cgroup *mem,
> */
> if (!batch->memcg)
> batch->memcg = mem;
> +
> + if (!batch->zone)
> + batch->zone = page_zone(page);
> +
> /*
> * do_batch > 0 when unmapping pages or inode invalidate/truncate.
> * In those cases, all pages freed continously can be expected to be in
> @@ -2747,12 +2852,17 @@ static void mem_cgroup_do_uncharge(struct mem_cgroup *mem,
> */
> if (batch->memcg != mem)
> goto direct_uncharge;
> +
> + if (batch->zone != page_zone(page))
> + mem_cgroup_mz_clear_unreclaimable(mem, page_zone(page));
> +
> /* remember freed charge and uncharge it later */
> batch->nr_pages++;
> if (uncharge_memsw)
> batch->memsw_nr_pages++;
> return;
> direct_uncharge:
> + mem_cgroup_mz_clear_unreclaimable(mem, page_zone(page));
> res_counter_uncharge(&mem->res, nr_pages * PAGE_SIZE);
> if (uncharge_memsw)
> res_counter_uncharge(&mem->memsw, nr_pages * PAGE_SIZE);
> @@ -2834,7 +2944,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
> mem_cgroup_get(mem);
> }
> if (!mem_cgroup_is_root(mem))
> - mem_cgroup_do_uncharge(mem, nr_pages, ctype);
> + mem_cgroup_do_uncharge(mem, nr_pages, page, ctype);
>
> return mem;
>
> @@ -2902,6 +3012,10 @@ void mem_cgroup_uncharge_end(void)
> if (batch->memsw_nr_pages)
> res_counter_uncharge(&batch->memcg->memsw,
> batch->memsw_nr_pages * PAGE_SIZE);
> + if (batch->zone)
> + mem_cgroup_mz_clear_unreclaimable(batch->memcg, batch->zone);
> + batch->zone = NULL;
> +
> memcg_oom_recover(batch->memcg);
> /* forget this pointer (for sanity check) */
> batch->memcg = NULL;
> @@ -4667,6 +4781,8 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
> mz->usage_in_excess = 0;
> mz->on_tree = false;
> mz->mem = mem;
> + mz->pages_scanned = 0;
> + mz->all_unreclaimable = false;
> }
> return 0;
> }
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index ba03a10..87653d6 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1414,6 +1414,9 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
> ISOLATE_BOTH : ISOLATE_INACTIVE,
> zone, sc->mem_cgroup,
> 0, file);
> +
> + mem_cgroup_mz_pages_scanned(sc->mem_cgroup, zone, nr_scanned);
> +
> /*
> * mem_cgroup_isolate_pages() keeps track of
> * scanned pages on its own.
> @@ -1533,6 +1536,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
> * mem_cgroup_isolate_pages() keeps track of
> * scanned pages on its own.
> */
> + mem_cgroup_mz_pages_scanned(sc->mem_cgroup, zone, pgscanned);
> }
>
> reclaim_stat->recent_scanned[file] += nr_taken;
> @@ -1989,7 +1993,8 @@ static void shrink_zones(int priority, struct zonelist *zonelist,
>
> static bool zone_reclaimable(struct zone *zone)
> {
> - return zone->pages_scanned < zone_reclaimable_pages(zone) * 6;
> + return zone->pages_scanned < zone_reclaimable_pages(zone) *
> + ZONE_RECLAIMABLE_RATE;
> }
>
> /*
> @@ -2651,10 +2656,20 @@ static void shrink_memcg_node(pg_data_t *pgdat, int order,
> if (!scan)
> continue;
>
> + if (mem_cgroup_mz_unreclaimable(mem_cont, zone) &&
> + priority != DEF_PRIORITY)
> + continue;
> +
> sc->nr_scanned = 0;
> shrink_zone(priority, zone, sc);
> total_scanned += sc->nr_scanned;
>
> + if (mem_cgroup_mz_unreclaimable(mem_cont, zone))
> + continue;
> +
> + if (!mem_cgroup_zone_reclaimable(mem_cont, zone))
> + mem_cgroup_mz_set_unreclaimable(mem_cont, zone);
> +
> /*
> * If we've done a decent amount of scanning and
> * the reclaim ratio is low, start doing writepage
> @@ -2716,10 +2731,16 @@ static unsigned long shrink_mem_cgroup(struct mem_cgroup *mem_cont, int order)
> shrink_memcg_node(pgdat, order, &sc);
> total_scanned += sc.nr_scanned;
>
> + /*
> + * Set the node which has at least one reclaimable
> + * zone
> + */
> for (i = pgdat->nr_zones - 1; i >= 0; i--) {
> struct zone *zone = pgdat->node_zones + i;
>
> - if (populated_zone(zone))
> + if (populated_zone(zone) &&
> + !mem_cgroup_mz_unreclaimable(mem_cont,
> + zone))
> break;
global reclaim call shrink_zone() when priority==DEF_PRIORITY even if
all_unreclaimable is set. Is this intentional change?
If so, please add some comments.
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