mm, memcg: create mem_cgroup_from_seq

This is the start of a series of patches similar to my earlier
DEFINE_MEMCG_MAX_OR_VAL work, but with less Macro Magic(tm).

There are a bunch of places we go from seq_file to mem_cgroup, which
currently requires manually getting the css, then getting the mem_cgroup
from the css.  It's in enough places now that having mem_cgroup_from_seq
makes sense (and also makes the next patch a bit nicer).

Link: http://lkml.kernel.org/r/20190124194050.GA31341@chrisdown.name
Signed-off-by: Chris Down <chris@chrisdown.name>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index b0eb29e..1f3d880 100644 (file)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -429,6 +429,11 @@ static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
 }
 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
 
+static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
+{
+       return mem_cgroup_from_css(seq_css(m));
+}
+
 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
 {
        struct mem_cgroup_per_node *mz;
@@ -937,6 +942,11 @@ static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
        return NULL;
 }
 
+static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
+{
+       return NULL;
+}
+
 static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
 {
        return NULL;

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f93f7f2..027abf9 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3337,7 +3337,7 @@ static int memcg_numa_stat_show(struct seq_file *m, void *v)
        const struct numa_stat *stat;
        int nid;
        unsigned long nr;
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
        for (stat = stats; stat < stats + ARRAY_SIZE(stats); stat++) {
                nr = mem_cgroup_nr_lru_pages(memcg, stat->lru_mask);
@@ -3388,7 +3388,7 @@ static const char *const memcg1_event_names[] = {
 
 static int memcg_stat_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
        unsigned long memory, memsw;
        struct mem_cgroup *mi;
        unsigned int i;
@@ -3820,7 +3820,7 @@ static void mem_cgroup_oom_unregister_event(struct mem_cgroup *memcg,
 
 static int mem_cgroup_oom_control_read(struct seq_file *sf, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(sf));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(sf);
 
        seq_printf(sf, "oom_kill_disable %d\n", memcg->oom_kill_disable);
        seq_printf(sf, "under_oom %d\n", (bool)memcg->under_oom);
@@ -5363,7 +5363,7 @@ static u64 memory_current_read(struct cgroup_subsys_state *css,
 
 static int memory_min_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
        unsigned long min = READ_ONCE(memcg->memory.min);
 
        if (min == PAGE_COUNTER_MAX)
@@ -5393,7 +5393,7 @@ static ssize_t memory_min_write(struct kernfs_open_file *of,
 
 static int memory_low_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
        unsigned long low = READ_ONCE(memcg->memory.low);
 
        if (low == PAGE_COUNTER_MAX)
@@ -5423,7 +5423,7 @@ static ssize_t memory_low_write(struct kernfs_open_file *of,
 
 static int memory_high_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
        unsigned long high = READ_ONCE(memcg->high);
 
        if (high == PAGE_COUNTER_MAX)
@@ -5460,7 +5460,7 @@ static ssize_t memory_high_write(struct kernfs_open_file *of,
 
 static int memory_max_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
        unsigned long max = READ_ONCE(memcg->memory.max);
 
        if (max == PAGE_COUNTER_MAX)
@@ -5522,7 +5522,7 @@ static ssize_t memory_max_write(struct kernfs_open_file *of,
 
 static int memory_events_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
        seq_printf(m, "low %lu\n",
                   atomic_long_read(&memcg->memory_events[MEMCG_LOW]));
@@ -5540,7 +5540,7 @@ static int memory_events_show(struct seq_file *m, void *v)
 
 static int memory_stat_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
        struct accumulated_stats acc;
        int i;
 
@@ -5617,7 +5617,7 @@ static int memory_stat_show(struct seq_file *m, void *v)
 
 static int memory_oom_group_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
        seq_printf(m, "%d\n", memcg->oom_group);
 
@@ -6600,7 +6600,7 @@ static u64 swap_current_read(struct cgroup_subsys_state *css,
 
 static int swap_max_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
        unsigned long max = READ_ONCE(memcg->swap.max);
 
        if (max == PAGE_COUNTER_MAX)
@@ -6630,7 +6630,7 @@ static ssize_t swap_max_write(struct kernfs_open_file *of,
 
 static int swap_events_show(struct seq_file *m, void *v)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
        seq_printf(m, "max %lu\n",
                   atomic_long_read(&memcg->memory_events[MEMCG_SWAP_MAX]));

diff --git a/mm/slab_common.c b/mm/slab_common.c
index f9d89c1..cd75b89 100644 (file)
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1425,7 +1425,7 @@ void dump_unreclaimable_slab(void)
 #if defined(CONFIG_MEMCG)
 void *memcg_slab_start(struct seq_file *m, loff_t *pos)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
        mutex_lock(&slab_mutex);
        return seq_list_start(&memcg->kmem_caches, *pos);
@@ -1433,7 +1433,7 @@ void *memcg_slab_start(struct seq_file *m, loff_t *pos)
 
 void *memcg_slab_next(struct seq_file *m, void *p, loff_t *pos)
 {
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
        return seq_list_next(p, &memcg->kmem_caches, pos);
 }
@@ -1447,7 +1447,7 @@ int memcg_slab_show(struct seq_file *m, void *p)
 {
        struct kmem_cache *s = list_entry(p, struct kmem_cache,
                                          memcg_params.kmem_caches_node);
-       struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+       struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
 
        if (p == memcg->kmem_caches.next)
                print_slabinfo_header(m);