hugetlbfs: add memcg control files for hugetlbfs

Add the control files for hugetlbfs in memcg.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 4df09e94539263d420762ace792c7e0ef6dee912..7baa8ed5c5ab38c2ffbe27359e8fb6bcbf68334b 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -4,6 +4,7 @@
 #include <linux/mm_types.h>
 #include <linux/fs.h>
 #include <linux/hugetlb_inline.h>
+#include <linux/cgroup.h>
 
 struct ctl_table;
 struct user_struct;
@@ -215,6 +216,10 @@ struct hstate {
        unsigned int nr_huge_pages_node[MAX_NUMNODES];
        unsigned int free_huge_pages_node[MAX_NUMNODES];
        unsigned int surplus_huge_pages_node[MAX_NUMNODES];
+#ifdef CONFIG_MEM_RES_CTLR_HUGETLB
+       /* mem cgroup control files */
+       struct cftype mem_cgroup_files[4];
+#endif
        char name[HSTATE_NAME_LEN];
 };
 

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 1d07e145bd06ad55dc709947b82019b4da4c6e3b..4f1757420ed97b3dee5796a9840134c53171308a 100644 (file)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -459,6 +459,7 @@ extern void mem_cgroup_hugetlb_uncharge_page(int idx, unsigned long nr_pages,
                                             struct page *page);
 extern void mem_cgroup_hugetlb_uncharge_memcg(int idx, unsigned long nr_pages,
                                              struct mem_cgroup *memcg);
+extern int mem_cgroup_hugetlb_file_init(int idx) __init;
 
 #else
 static inline int
@@ -489,6 +490,12 @@ mem_cgroup_hugetlb_uncharge_memcg(int idx, unsigned long nr_pages,
 {
        return;
 }
+
+static inline int mem_cgroup_hugetlb_file_init(int idx)
+{
+       return 0;
+}
+
 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
 #endif /* _LINUX_MEMCONTROL_H */
 

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 10980022b19158696bbc37613985136fbb209698..30a552f555be3312f2250d34df5ccff6e6296695 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1931,7 +1931,7 @@ void __init hugetlb_add_hstate(unsigned order)
        h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]);
        snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",
                                        huge_page_size(h)/1024);
-
+       mem_cgroup_hugetlb_file_init(hugetlb_max_hstate - 1);
        parsed_hstate = h;
 }
 

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e3e2b86226496bca251ede1a50ea080896e04d88..a9e26d8a7abd1fa186e8fac4225f1b8ef5b9600c 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5205,6 +5205,57 @@ static void mem_cgroup_destroy(struct cgroup *cont)
        mem_cgroup_put(memcg);
 }
 
+#ifdef CONFIG_MEM_RES_CTLR_HUGETLB
+static char *mem_fmt(char *buf, unsigned long n)
+{
+       if (n >= (1UL << 30))
+               sprintf(buf, "%luGB", n >> 30);
+       else if (n >= (1UL << 20))
+               sprintf(buf, "%luMB", n >> 20);
+       else
+               sprintf(buf, "%luKB", n >> 10);
+       return buf;
+}
+
+int __init mem_cgroup_hugetlb_file_init(int idx)
+{
+       char buf[32];
+       struct cftype *cft;
+       struct hstate *h = &hstates[idx];
+
+       /* format the size */
+       mem_fmt(buf, huge_page_size(h));
+
+       /* Add the limit file */
+       cft = &h->mem_cgroup_files[0];
+       snprintf(cft->name, MAX_CFTYPE_NAME, "hugetlb.%s.limit_in_bytes", buf);
+       cft->private = __MEMFILE_PRIVATE(idx, _MEMHUGETLB, RES_LIMIT);
+       cft->read = mem_cgroup_read;
+       cft->write_string = mem_cgroup_write;
+
+       /* Add the usage file */
+       cft = &h->mem_cgroup_files[1];
+       snprintf(cft->name, MAX_CFTYPE_NAME, "hugetlb.%s.usage_in_bytes", buf);
+       cft->private  = __MEMFILE_PRIVATE(idx, _MEMHUGETLB, RES_USAGE);
+       cft->read = mem_cgroup_read;
+
+       /* Add the MAX usage file */
+       cft = &h->mem_cgroup_files[2];
+       snprintf(cft->name, MAX_CFTYPE_NAME, "hugetlb.%s.max_usage_in_bytes", buf);
+       cft->private  = __MEMFILE_PRIVATE(idx, _MEMHUGETLB, RES_MAX_USAGE);
+       cft->trigger  = mem_cgroup_reset;
+       cft->read = mem_cgroup_read;
+
+       /* NULL terminate the last cft */
+       cft = &h->mem_cgroup_files[3];
+       memset(cft, 0, sizeof(*cft));
+
+       WARN_ON(cgroup_add_cftypes(&mem_cgroup_subsys, h->mem_cgroup_files));
+
+       return 0;
+}
+#endif
+
 #ifdef CONFIG_MMU
 /* Handlers for move charge at task migration. */
 #define PRECHARGE_COUNT_AT_ONCE        256