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    Subject[PATCH v3 17/21] mm: handle lruvec relock in memory controller
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    Date
    Carefully relock lruvec lru lock at page memory cgroup change.

    * In free_pn_rcu() wait for lruvec lock release.
    Locking primitives keep lruvec pointer after successful lock held.

    Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
    ---
    mm/memcontrol.c | 19 +++++++++++++------
    1 files changed, 13 insertions(+), 6 deletions(-)

    diff --git a/mm/memcontrol.c b/mm/memcontrol.c
    index aed1360..230f434 100644
    --- a/mm/memcontrol.c
    +++ b/mm/memcontrol.c
    @@ -2542,7 +2542,6 @@ __mem_cgroup_commit_charge_lrucare(struct page *page, struct mem_cgroup *memcg,
    enum charge_type ctype)
    {
    struct page_cgroup *pc = lookup_page_cgroup(page);
    - struct zone *zone = page_zone(page);
    struct lruvec *lruvec;
    unsigned long flags;
    bool removed = false;
    @@ -2552,20 +2551,19 @@ __mem_cgroup_commit_charge_lrucare(struct page *page, struct mem_cgroup *memcg,
    * is already on LRU. It means the page may on some other page_cgroup's
    * LRU. Take care of it.
    */
    - spin_lock_irqsave(&zone->lru_lock, flags);
    + lruvec = lock_page_lruvec(page, &flags);
    if (PageLRU(page)) {
    - lruvec = page_lruvec(page);
    del_page_from_lru_list(lruvec, page, page_lru(page));
    ClearPageLRU(page);
    removed = true;
    }
    __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype);
    if (removed) {
    - lruvec = page_lruvec(page);
    + lruvec = __relock_page_lruvec(lruvec, page);
    add_page_to_lru_list(lruvec, page, page_lru(page));
    SetPageLRU(page);
    }
    - spin_unlock_irqrestore(&zone->lru_lock, flags);
    + unlock_lruvec(lruvec, &flags);
    }

    int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
    @@ -4624,7 +4622,16 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)

    static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
    {
    - kfree(memcg->info.nodeinfo[node]);
    + struct mem_cgroup_per_node *pn = memcg->info.nodeinfo[node];
    + int zone;
    +
    + if (!pn)
    + return;
    +
    + for (zone = 0; zone < MAX_NR_ZONES; zone++)
    + wait_lruvec_unlock(&pn->zoneinfo[zone].lruvec);
    +
    + kfree(pn);
    }

    static struct mem_cgroup *mem_cgroup_alloc(void)


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