memcg: replace mem and mem_cont stragglers

Replace mem and mem_cont stragglers in memcontrol.c by memcg.

Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index bb04067269bc4fb2b5f6c9d08a9ba5e94ee8e4b7..e5370db7ad722f1ba702af025ad2d8570231f1b7 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -144,7 +144,7 @@ struct mem_cgroup_per_zone {
        unsigned long long      usage_in_excess;/* Set to the value by which */
                                                /* the soft limit is exceeded*/
        bool                    on_tree;
-       struct mem_cgroup       *mem;           /* Back pointer, we cannot */
+       struct mem_cgroup       *memcg;         /* Back pointer, we cannot */
                                                /* use container_of        */
 };
 /* Macro for accessing counter */
@@ -612,9 +612,9 @@ retry:
         * we will to add it back at the end of reclaim to its correct
         * position in the tree.
         */
-       __mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
-       if (!res_counter_soft_limit_excess(&mz->mem->res) ||
-               !css_tryget(&mz->mem->css))
+       __mem_cgroup_remove_exceeded(mz->memcg, mz, mctz);
+       if (!res_counter_soft_limit_excess(&mz->memcg->res) ||
+               !css_tryget(&mz->memcg->css))
                goto retry;
 done:
        return mz;
@@ -1772,22 +1772,22 @@ static DEFINE_SPINLOCK(memcg_oom_lock);
 static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq);
 
 struct oom_wait_info {
-       struct mem_cgroup *mem;
+       struct mem_cgroup *memcg;
        wait_queue_t    wait;
 };
 
 static int memcg_oom_wake_function(wait_queue_t *wait,
        unsigned mode, int sync, void *arg)
 {
-       struct mem_cgroup *wake_memcg = (struct mem_cgroup *)arg,
-                         *oom_wait_memcg;
+       struct mem_cgroup *wake_memcg = (struct mem_cgroup *)arg;
+       struct mem_cgroup *oom_wait_memcg;
        struct oom_wait_info *oom_wait_info;
 
        oom_wait_info = container_of(wait, struct oom_wait_info, wait);
-       oom_wait_memcg = oom_wait_info->mem;
+       oom_wait_memcg = oom_wait_info->memcg;
 
        /*
-        * Both of oom_wait_info->mem and wake_mem are stable under us.
+        * Both of oom_wait_info->memcg and wake_memcg are stable under us.
         * Then we can use css_is_ancestor without taking care of RCU.
         */
        if (!mem_cgroup_same_or_subtree(oom_wait_memcg, wake_memcg)
@@ -1816,7 +1816,7 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
        struct oom_wait_info owait;
        bool locked, need_to_kill;
 
-       owait.mem = memcg;
+       owait.memcg = memcg;
        owait.wait.flags = 0;
        owait.wait.func = memcg_oom_wake_function;
        owait.wait.private = current;
@@ -3549,7 +3549,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
                        break;
 
                nr_scanned = 0;
-               reclaimed = mem_cgroup_soft_reclaim(mz->mem, zone,
+               reclaimed = mem_cgroup_soft_reclaim(mz->memcg, zone,
                                                    gfp_mask, &nr_scanned);
                nr_reclaimed += reclaimed;
                *total_scanned += nr_scanned;
@@ -3576,13 +3576,13 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
                                next_mz =
                                __mem_cgroup_largest_soft_limit_node(mctz);
                                if (next_mz == mz)
-                                       css_put(&next_mz->mem->css);
+                                       css_put(&next_mz->memcg->css);
                                else /* next_mz == NULL or other memcg */
                                        break;
                        } while (1);
                }
-               __mem_cgroup_remove_exceeded(mz->mem, mz, mctz);
-               excess = res_counter_soft_limit_excess(&mz->mem->res);
+               __mem_cgroup_remove_exceeded(mz->memcg, mz, mctz);
+               excess = res_counter_soft_limit_excess(&mz->memcg->res);
                /*
                 * One school of thought says that we should not add
                 * back the node to the tree if reclaim returns 0.
@@ -3592,9 +3592,9 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
                 * term TODO.
                 */
                /* If excess == 0, no tree ops */
-               __mem_cgroup_insert_exceeded(mz->mem, mz, mctz, excess);
+               __mem_cgroup_insert_exceeded(mz->memcg, mz, mctz, excess);
                spin_unlock(&mctz->lock);
-               css_put(&mz->mem->css);
+               css_put(&mz->memcg->css);
                loop++;
                /*
                 * Could not reclaim anything and there are no more
@@ -3607,7 +3607,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
                        break;
        } while (!nr_reclaimed);
        if (next_mz)
-               css_put(&next_mz->mem->css);
+               css_put(&next_mz->memcg->css);
        return nr_reclaimed;
 }
 
@@ -4098,38 +4098,38 @@ static int mem_control_numa_stat_show(struct seq_file *m, void *arg)
        unsigned long total_nr, file_nr, anon_nr, unevictable_nr;
        unsigned long node_nr;
        struct cgroup *cont = m->private;
-       struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont);
+       struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
 
-       total_nr = mem_cgroup_nr_lru_pages(mem_cont, LRU_ALL);
+       total_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL);
        seq_printf(m, "total=%lu", total_nr);
        for_each_node_state(nid, N_HIGH_MEMORY) {
-               node_nr = mem_cgroup_node_nr_lru_pages(mem_cont, nid, LRU_ALL);
+               node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid, LRU_ALL);
                seq_printf(m, " N%d=%lu", nid, node_nr);
        }
        seq_putc(m, '\n');
 
-       file_nr = mem_cgroup_nr_lru_pages(mem_cont, LRU_ALL_FILE);
+       file_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL_FILE);
        seq_printf(m, "file=%lu", file_nr);
        for_each_node_state(nid, N_HIGH_MEMORY) {
-               node_nr = mem_cgroup_node_nr_lru_pages(mem_cont, nid,
+               node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
                                LRU_ALL_FILE);
                seq_printf(m, " N%d=%lu", nid, node_nr);
        }
        seq_putc(m, '\n');
 
-       anon_nr = mem_cgroup_nr_lru_pages(mem_cont, LRU_ALL_ANON);
+       anon_nr = mem_cgroup_nr_lru_pages(memcg, LRU_ALL_ANON);
        seq_printf(m, "anon=%lu", anon_nr);
        for_each_node_state(nid, N_HIGH_MEMORY) {
-               node_nr = mem_cgroup_node_nr_lru_pages(mem_cont, nid,
+               node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
                                LRU_ALL_ANON);
                seq_printf(m, " N%d=%lu", nid, node_nr);
        }
        seq_putc(m, '\n');
 
-       unevictable_nr = mem_cgroup_nr_lru_pages(mem_cont, BIT(LRU_UNEVICTABLE));
+       unevictable_nr = mem_cgroup_nr_lru_pages(memcg, BIT(LRU_UNEVICTABLE));
        seq_printf(m, "unevictable=%lu", unevictable_nr);
        for_each_node_state(nid, N_HIGH_MEMORY) {
-               node_nr = mem_cgroup_node_nr_lru_pages(mem_cont, nid,
+               node_nr = mem_cgroup_node_nr_lru_pages(memcg, nid,
                                BIT(LRU_UNEVICTABLE));
                seq_printf(m, " N%d=%lu", nid, node_nr);
        }
@@ -4141,12 +4141,12 @@ static int mem_control_numa_stat_show(struct seq_file *m, void *arg)
 static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
                                 struct cgroup_map_cb *cb)
 {
-       struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont);
+       struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
        struct mcs_total_stat mystat;
        int i;
 
        memset(&mystat, 0, sizeof(mystat));
-       mem_cgroup_get_local_stat(mem_cont, &mystat);
+       mem_cgroup_get_local_stat(memcg, &mystat);
 
 
        for (i = 0; i < NR_MCS_STAT; i++) {
@@ -4158,14 +4158,14 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
        /* Hierarchical information */
        {
                unsigned long long limit, memsw_limit;
-               memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit);
+               memcg_get_hierarchical_limit(memcg, &limit, &memsw_limit);
                cb->fill(cb, "hierarchical_memory_limit", limit);
                if (do_swap_account)
                        cb->fill(cb, "hierarchical_memsw_limit", memsw_limit);
        }
 
        memset(&mystat, 0, sizeof(mystat));
-       mem_cgroup_get_total_stat(mem_cont, &mystat);
+       mem_cgroup_get_total_stat(memcg, &mystat);
        for (i = 0; i < NR_MCS_STAT; i++) {
                if (i == MCS_SWAP && !do_swap_account)
                        continue;
@@ -4181,7 +4181,7 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
 
                for_each_online_node(nid)
                        for (zid = 0; zid < MAX_NR_ZONES; zid++) {
-                               mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
+                               mz = mem_cgroup_zoneinfo(memcg, nid, zid);
 
                                recent_rotated[0] +=
                                        mz->reclaim_stat.recent_rotated[0];
@@ -4758,7 +4758,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
                        INIT_LIST_HEAD(&mz->lruvec.lists[l]);
                mz->usage_in_excess = 0;
                mz->on_tree = false;
-               mz->mem = memcg;
+               mz->memcg = memcg;
        }
        memcg->info.nodeinfo[node] = pn;
        return 0;
@@ -4771,29 +4771,29 @@ static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
 
 static struct mem_cgroup *mem_cgroup_alloc(void)
 {
-       struct mem_cgroup *mem;
+       struct mem_cgroup *memcg;
        int size = sizeof(struct mem_cgroup);
 
        /* Can be very big if MAX_NUMNODES is very big */
        if (size < PAGE_SIZE)
-               mem = kzalloc(size, GFP_KERNEL);
+               memcg = kzalloc(size, GFP_KERNEL);
        else
-               mem = vzalloc(size);
+               memcg = vzalloc(size);
 
-       if (!mem)
+       if (!memcg)
                return NULL;
 
-       mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
-       if (!mem->stat)
+       memcg->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
+       if (!memcg->stat)
                goto out_free;
-       spin_lock_init(&mem->pcp_counter_lock);
-       return mem;
+       spin_lock_init(&memcg->pcp_counter_lock);
+       return memcg;
 
 out_free:
        if (size < PAGE_SIZE)
-               kfree(mem);
+               kfree(memcg);
        else
-               vfree(mem);
+               vfree(memcg);
        return NULL;
 }