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    Subject[PATCH v3 10/21] mm: kill struct mem_cgroup_zone
    From
    Date
    struct mem_cgroup_zone always points to one lruvec, either root zone->lruvec or
    to some from memcg. So this fancy pointer can be replaced with direct pointer to
    struct lruvec, because all required infromation already collected on lruvec.

    Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
    ---
    mm/vmscan.c | 186 ++++++++++++++++++++++-------------------------------------
    1 files changed, 70 insertions(+), 116 deletions(-)

    diff --git a/mm/vmscan.c b/mm/vmscan.c
    index 98bd61f..f5e7046 100644
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -115,11 +115,6 @@ struct scan_control {
    nodemask_t *nodemask;
    };

    -struct mem_cgroup_zone {
    - struct mem_cgroup *mem_cgroup;
    - struct zone *zone;
    -};
    -
    #define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))

    #ifdef ARCH_HAS_PREFETCH
    @@ -164,45 +159,13 @@ static bool global_reclaim(struct scan_control *sc)
    {
    return !sc->target_mem_cgroup;
    }
    -
    -static bool scanning_global_lru(struct mem_cgroup_zone *mz)
    -{
    - return !mz->mem_cgroup;
    -}
    #else
    static bool global_reclaim(struct scan_control *sc)
    {
    return true;
    }
    -
    -static bool scanning_global_lru(struct mem_cgroup_zone *mz)
    -{
    - return true;
    -}
    #endif

    -static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
    -{
    - if (!scanning_global_lru(mz))
    - return &mem_cgroup_zone_lruvec(mz->zone,
    - mz->mem_cgroup)->reclaim_stat;
    -
    - return &mz->zone->lruvec.reclaim_stat;
    -}
    -
    -static unsigned long zone_nr_lru_pages(struct mem_cgroup_zone *mz,
    - enum lru_list lru)
    -{
    - if (!scanning_global_lru(mz))
    - return mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
    - zone_to_nid(mz->zone),
    - zone_idx(mz->zone),
    - BIT(lru));
    -
    - return zone_page_state(mz->zone, NR_LRU_BASE + lru);
    -}
    -
    -
    /*
    * Add a shrinker callback to be called from the vm
    */
    @@ -764,7 +727,7 @@ static enum page_references page_check_references(struct page *page,
    * shrink_page_list() returns the number of reclaimed pages
    */
    static unsigned long shrink_page_list(struct list_head *page_list,
    - struct mem_cgroup_zone *mz,
    + struct lruvec *lruvec,
    struct scan_control *sc,
    int priority,
    unsigned long *ret_nr_dirty,
    @@ -795,7 +758,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
    goto keep;

    VM_BUG_ON(PageActive(page));
    - VM_BUG_ON(page_zone(page) != mz->zone);
    + VM_BUG_ON(page_zone(page) != lruvec_zone(lruvec));

    sc->nr_scanned++;

    @@ -1021,7 +984,7 @@ keep_lumpy:
    * will encounter the same problem
    */
    if (nr_dirty && nr_dirty == nr_congested && global_reclaim(sc))
    - zone_set_flag(mz->zone, ZONE_CONGESTED);
    + zone_set_flag(lruvec_zone(lruvec), ZONE_CONGESTED);

    free_hot_cold_page_list(&free_pages, 1);

    @@ -1136,7 +1099,7 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
    * Appropriate locks must be held before calling this function.
    *
    * @nr_to_scan: The number of pages to look through on the list.
    - * @mz: The mem_cgroup_zone to pull pages from.
    + * @lruvec The struct lruvec to pull pages from.
    * @dst: The temp list to put pages on to.
    * @nr_scanned: The number of pages that were scanned.
    * @sc: The scan_control struct for this reclaim session
    @@ -1147,11 +1110,10 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
    * returns how many pages were moved onto *@dst.
    */
    static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
    - struct mem_cgroup_zone *mz, struct list_head *dst,
    + struct lruvec *lruvec, struct list_head *dst,
    unsigned long *nr_scanned, struct scan_control *sc,
    isolate_mode_t mode, int active, int file)
    {
    - struct lruvec *lruvec;
    struct list_head *src;
    unsigned long nr_taken = 0;
    unsigned long nr_lumpy_taken = 0;
    @@ -1160,7 +1122,6 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
    unsigned long scan;
    int lru = LRU_BASE;

    - lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
    if (active)
    lru += LRU_ACTIVE;
    if (file)
    @@ -1366,11 +1327,11 @@ static int too_many_isolated(struct zone *zone, int file,
    }

    static noinline_for_stack void
    -putback_inactive_pages(struct mem_cgroup_zone *mz,
    +putback_inactive_pages(struct lruvec *lruvec,
    struct list_head *page_list)
    {
    - struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
    - struct zone *zone = mz->zone;
    + struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
    + struct zone *zone = lruvec_zone(lruvec);
    LIST_HEAD(pages_to_free);

    /*
    @@ -1417,13 +1378,13 @@ putback_inactive_pages(struct mem_cgroup_zone *mz,
    }

    static noinline_for_stack void
    -update_isolated_counts(struct mem_cgroup_zone *mz,
    +update_isolated_counts(struct lruvec *lruvec,
    struct list_head *page_list,
    unsigned long *nr_anon,
    unsigned long *nr_file)
    {
    - struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
    - struct zone *zone = mz->zone;
    + struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
    + struct zone *zone = lruvec_zone(lruvec);
    unsigned int count[NR_LRU_LISTS] = { 0, };
    unsigned long nr_active = 0;
    struct page *page;
    @@ -1507,7 +1468,7 @@ static inline bool should_reclaim_stall(unsigned long nr_taken,
    * of reclaimed pages
    */
    static noinline_for_stack unsigned long
    -shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
    +shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
    struct scan_control *sc, int priority, int file)
    {
    LIST_HEAD(page_list);
    @@ -1519,7 +1480,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
    unsigned long nr_dirty = 0;
    unsigned long nr_writeback = 0;
    isolate_mode_t isolate_mode = ISOLATE_INACTIVE;
    - struct zone *zone = mz->zone;
    + struct zone *zone = lruvec_zone(lruvec);

    while (unlikely(too_many_isolated(zone, file, sc))) {
    congestion_wait(BLK_RW_ASYNC, HZ/10);
    @@ -1542,8 +1503,9 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,

    spin_lock_irq(&zone->lru_lock);

    - nr_taken = isolate_lru_pages(nr_to_scan, mz, &page_list, &nr_scanned,
    - sc, isolate_mode, 0, file);
    + nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &page_list,
    + &nr_scanned, sc, isolate_mode, 0, file);
    +
    if (global_reclaim(sc)) {
    zone->pages_scanned += nr_scanned;
    if (current_is_kswapd())
    @@ -1559,20 +1521,20 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
    return 0;
    }

    - update_isolated_counts(mz, &page_list, &nr_anon, &nr_file);
    + update_isolated_counts(lruvec, &page_list, &nr_anon, &nr_file);

    __mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
    __mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);

    spin_unlock_irq(&zone->lru_lock);

    - nr_reclaimed = shrink_page_list(&page_list, mz, sc, priority,
    + nr_reclaimed = shrink_page_list(&page_list, lruvec, sc, priority,
    &nr_dirty, &nr_writeback);

    /* Check if we should syncronously wait for writeback */
    if (should_reclaim_stall(nr_taken, nr_reclaimed, priority, sc)) {
    set_reclaim_mode(priority, sc, true);
    - nr_reclaimed += shrink_page_list(&page_list, mz, sc,
    + nr_reclaimed += shrink_page_list(&page_list, lruvec, sc,
    priority, &nr_dirty, &nr_writeback);
    }

    @@ -1582,7 +1544,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
    __count_vm_events(KSWAPD_STEAL, nr_reclaimed);
    __count_zone_vm_events(PGSTEAL, zone, nr_reclaimed);

    - putback_inactive_pages(mz, &page_list);
    + putback_inactive_pages(lruvec, &page_list);

    __mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
    __mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
    @@ -1697,7 +1659,7 @@ static void move_active_pages_to_lru(struct zone *zone,
    }

    static void shrink_active_list(unsigned long nr_to_scan,
    - struct mem_cgroup_zone *mz,
    + struct lruvec *lruvec,
    struct scan_control *sc,
    int priority, int file)
    {
    @@ -1708,10 +1670,10 @@ static void shrink_active_list(unsigned long nr_to_scan,
    LIST_HEAD(l_active);
    LIST_HEAD(l_inactive);
    struct page *page;
    - struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
    + struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
    unsigned long nr_rotated = 0;
    isolate_mode_t isolate_mode = ISOLATE_ACTIVE;
    - struct zone *zone = mz->zone;
    + struct zone *zone = lruvec_zone(lruvec);

    lru_add_drain();

    @@ -1722,8 +1684,9 @@ static void shrink_active_list(unsigned long nr_to_scan,

    spin_lock_irq(&zone->lru_lock);

    - nr_taken = isolate_lru_pages(nr_to_scan, mz, &l_hold, &nr_scanned, sc,
    - isolate_mode, 1, file);
    + nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold, &nr_scanned,
    + sc, isolate_mode, 1, file);
    +
    if (global_reclaim(sc))
    zone->pages_scanned += nr_scanned;

    @@ -1819,11 +1782,10 @@ static void shrink_active_list(unsigned long nr_to_scan,
    * 1TB 101 10GB
    * 10TB 320 32GB
    */
    -static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
    +static int inactive_anon_is_low(struct lruvec *lruvec)
    {
    unsigned long active, inactive;
    unsigned int gb, ratio;
    - struct lruvec *lruvec;

    /*
    * If we don't have swap space, anonymous page deactivation
    @@ -1832,7 +1794,6 @@ static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
    if (!total_swap_pages)
    return 0;

    - lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
    active = lruvec->pages_count[LRU_ACTIVE_ANON];
    inactive = lruvec->pages_count[LRU_INACTIVE_ANON];

    @@ -1846,7 +1807,7 @@ static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
    return inactive * ratio < active;
    }
    #else
    -static inline int inactive_anon_is_low(struct mem_cgroup_zone *mz)
    +static inline int inactive_anon_is_low(struct lruvec *lruvec)
    {
    return 0;
    }
    @@ -1866,39 +1827,38 @@ static inline int inactive_anon_is_low(struct mem_cgroup_zone *mz)
    * This uses a different ratio than the anonymous pages, because
    * the page cache uses a use-once replacement algorithm.
    */
    -static int inactive_file_is_low(struct mem_cgroup_zone *mz)
    +static int inactive_file_is_low(struct lruvec *lruvec)
    {
    unsigned long active, inactive;
    - struct lruvec *lruvec;

    - lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
    active = lruvec->pages_count[LRU_ACTIVE_FILE];
    inactive = lruvec->pages_count[LRU_INACTIVE_FILE];

    return inactive < active;
    }

    -static int inactive_list_is_low(struct mem_cgroup_zone *mz, int file)
    +static int inactive_list_is_low(struct lruvec *lruvec, int file)
    {
    if (file)
    - return inactive_file_is_low(mz);
    + return inactive_file_is_low(lruvec);
    else
    - return inactive_anon_is_low(mz);
    + return inactive_anon_is_low(lruvec);
    }

    static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
    - struct mem_cgroup_zone *mz,
    + struct lruvec *lruvec,
    struct scan_control *sc, int priority)
    {
    int file = is_file_lru(lru);

    if (is_active_lru(lru)) {
    - if (inactive_list_is_low(mz, file))
    - shrink_active_list(nr_to_scan, mz, sc, priority, file);
    + if (inactive_list_is_low(lruvec, file))
    + shrink_active_list(nr_to_scan, lruvec,
    + sc, priority, file);
    return 0;
    }

    - return shrink_inactive_list(nr_to_scan, mz, sc, priority, file);
    + return shrink_inactive_list(nr_to_scan, lruvec, sc, priority, file);
    }

    static int vmscan_swappiness(struct scan_control *sc)
    @@ -1916,17 +1876,18 @@ static int vmscan_swappiness(struct scan_control *sc)
    *
    * nr[0] = anon pages to scan; nr[1] = file pages to scan
    */
    -static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
    +static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
    unsigned long *nr, int priority)
    {
    unsigned long anon, file, free;
    unsigned long anon_prio, file_prio;
    unsigned long ap, fp;
    - struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
    + struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
    u64 fraction[2], denominator;
    enum lru_list lru;
    int noswap = 0;
    bool force_scan = false;
    + struct zone *zone = lruvec_zone(lruvec);

    /*
    * If the zone or memcg is small, nr[l] can be 0. This
    @@ -1938,7 +1899,7 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
    * latencies, so it's better to scan a minimum amount there as
    * well.
    */
    - if (current_is_kswapd() && mz->zone->all_unreclaimable)
    + if (current_is_kswapd() && zone->all_unreclaimable)
    force_scan = true;
    if (!global_reclaim(sc))
    force_scan = true;
    @@ -1952,16 +1913,16 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
    goto out;
    }

    - anon = zone_nr_lru_pages(mz, LRU_ACTIVE_ANON) +
    - zone_nr_lru_pages(mz, LRU_INACTIVE_ANON);
    - file = zone_nr_lru_pages(mz, LRU_ACTIVE_FILE) +
    - zone_nr_lru_pages(mz, LRU_INACTIVE_FILE);
    + anon = lruvec->pages_count[LRU_ACTIVE_ANON] +
    + lruvec->pages_count[LRU_INACTIVE_ANON];
    + file = lruvec->pages_count[LRU_ACTIVE_FILE] +
    + lruvec->pages_count[LRU_INACTIVE_FILE];

    if (global_reclaim(sc)) {
    - free = zone_page_state(mz->zone, NR_FREE_PAGES);
    + free = zone_page_state(zone, NR_FREE_PAGES);
    /* If we have very few page cache pages,
    force-scan anon pages. */
    - if (unlikely(file + free <= high_wmark_pages(mz->zone))) {
    + if (unlikely(file + free <= high_wmark_pages(zone))) {
    fraction[0] = 1;
    fraction[1] = 0;
    denominator = 1;
    @@ -1987,7 +1948,7 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
    *
    * anon in [0], file in [1]
    */
    - spin_lock_irq(&mz->zone->lru_lock);
    + spin_lock_irq(&zone->lru_lock);
    if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
    reclaim_stat->recent_scanned[0] /= 2;
    reclaim_stat->recent_rotated[0] /= 2;
    @@ -2008,7 +1969,7 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,

    fp = (file_prio + 1) * (reclaim_stat->recent_scanned[1] + 1);
    fp /= reclaim_stat->recent_rotated[1] + 1;
    - spin_unlock_irq(&mz->zone->lru_lock);
    + spin_unlock_irq(&zone->lru_lock);

    fraction[0] = ap;
    fraction[1] = fp;
    @@ -2018,7 +1979,7 @@ out:
    int file = is_file_lru(lru);
    unsigned long scan;

    - scan = zone_nr_lru_pages(mz, lru);
    + scan = lruvec->pages_count[lru];
    if (priority || noswap) {
    scan >>= priority;
    if (!scan && force_scan)
    @@ -2036,7 +1997,7 @@ out:
    * back to the allocator and call try_to_compact_zone(), we ensure that
    * there are enough free pages for it to be likely successful
    */
    -static inline bool should_continue_reclaim(struct mem_cgroup_zone *mz,
    +static inline bool should_continue_reclaim(struct lruvec *lruvec,
    unsigned long nr_reclaimed,
    unsigned long nr_scanned,
    struct scan_control *sc)
    @@ -2076,15 +2037,15 @@ static inline bool should_continue_reclaim(struct mem_cgroup_zone *mz,
    * inactive lists are large enough, continue reclaiming
    */
    pages_for_compaction = (2UL << sc->order);
    - inactive_lru_pages = zone_nr_lru_pages(mz, LRU_INACTIVE_FILE);
    + inactive_lru_pages = lruvec->pages_count[LRU_INACTIVE_FILE];
    if (nr_swap_pages > 0)
    - inactive_lru_pages += zone_nr_lru_pages(mz, LRU_INACTIVE_ANON);
    + inactive_lru_pages += lruvec->pages_count[LRU_INACTIVE_ANON];
    if (sc->nr_reclaimed < pages_for_compaction &&
    inactive_lru_pages > pages_for_compaction)
    return true;

    /* If compaction would go ahead or the allocation would succeed, stop */
    - switch (compaction_suitable(mz->zone, sc->order)) {
    + switch (compaction_suitable(lruvec_zone(lruvec), sc->order)) {
    case COMPACT_PARTIAL:
    case COMPACT_CONTINUE:
    return false;
    @@ -2096,8 +2057,8 @@ static inline bool should_continue_reclaim(struct mem_cgroup_zone *mz,
    /*
    * This is a basic per-zone page freer. Used by both kswapd and direct reclaim.
    */
    -static void shrink_mem_cgroup_zone(int priority, struct mem_cgroup_zone *mz,
    - struct scan_control *sc)
    +static void shrink_lruvec(int priority, struct lruvec *lruvec,
    + struct scan_control *sc)
    {
    unsigned long nr[NR_LRU_LISTS];
    unsigned long nr_to_scan;
    @@ -2109,7 +2070,7 @@ static void shrink_mem_cgroup_zone(int priority, struct mem_cgroup_zone *mz,
    restart:
    nr_reclaimed = 0;
    nr_scanned = sc->nr_scanned;
    - get_scan_count(mz, sc, nr, priority);
    + get_scan_count(lruvec, sc, nr, priority);

    blk_start_plug(&plug);
    while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
    @@ -2121,7 +2082,7 @@ restart:
    nr[lru] -= nr_to_scan;

    nr_reclaimed += shrink_list(lru, nr_to_scan,
    - mz, sc, priority);
    + lruvec, sc, priority);
    }
    }
    /*
    @@ -2147,11 +2108,11 @@ restart:
    * Even if we did not try to evict anon pages at all, we want to
    * rebalance the anon lru active/inactive ratio.
    */
    - if (inactive_anon_is_low(mz))
    - shrink_active_list(SWAP_CLUSTER_MAX, mz, sc, priority, 0);
    + if (inactive_anon_is_low(lruvec))
    + shrink_active_list(SWAP_CLUSTER_MAX, lruvec, sc, priority, 0);

    /* reclaim/compaction might need reclaim to continue */
    - if (should_continue_reclaim(mz, nr_reclaimed,
    + if (should_continue_reclaim(lruvec, nr_reclaimed,
    sc->nr_scanned - nr_scanned, sc))
    goto restart;

    @@ -2167,15 +2128,14 @@ static void shrink_zone(int priority, struct zone *zone,
    .priority = priority,
    };
    struct mem_cgroup *memcg;
    + struct lruvec *lruvec;

    memcg = mem_cgroup_iter(root, NULL, &reclaim);
    do {
    - struct mem_cgroup_zone mz = {
    - .mem_cgroup = memcg,
    - .zone = zone,
    - };
    + lruvec = mem_cgroup_zone_lruvec(zone, memcg);
    +
    + shrink_lruvec(priority, lruvec, sc);

    - shrink_mem_cgroup_zone(priority, &mz, sc);
    /*
    * Limit reclaim has historically picked one memcg and
    * scanned it with decreasing priority levels until
    @@ -2495,10 +2455,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
    .order = 0,
    .target_mem_cgroup = memcg,
    };
    - struct mem_cgroup_zone mz = {
    - .mem_cgroup = memcg,
    - .zone = zone,
    - };
    + struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);

    sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
    (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
    @@ -2514,7 +2471,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
    * will pick up pages from other mem cgroup's as well. We hack
    * the priority and make it zero.
    */
    - shrink_mem_cgroup_zone(0, &mz, &sc);
    + shrink_lruvec(0, lruvec, &sc);

    trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);

    @@ -2575,13 +2532,10 @@ static void age_active_anon(struct zone *zone, struct scan_control *sc,

    memcg = mem_cgroup_iter(NULL, NULL, NULL);
    do {
    - struct mem_cgroup_zone mz = {
    - .mem_cgroup = memcg,
    - .zone = zone,
    - };
    + struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);

    - if (inactive_anon_is_low(&mz))
    - shrink_active_list(SWAP_CLUSTER_MAX, &mz,
    + if (inactive_anon_is_low(lruvec))
    + shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
    sc, priority, 0);

    memcg = mem_cgroup_iter(NULL, memcg, NULL);


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