The new API exports numa_maps per-memcg basis. This is a piece of useful
information where it exports per-memcg page distribution across real numa
nodes.
One of the usecase is evaluating application performance by combining this
information w/ the cpu allocation to the application.
The output of the memory.numastat tries to follow w/ simiar format of numa_maps
like:
<total pages> N0=<node 0 pages> N1=<node 1 pages> ...
$ cat /dev/cgroup/memory/memory.numa_stat
292115 N0=36364 N1=166876 N2=39741 N3=49115
Note: I noticed <total pages> is not equal to the sum of the rest of counters.
I might need to change the way get that counter, comments are welcomed.
Signed-off-by: Ying Han <yinghan@xxxxxxxxxx>
---
mm/memcontrol.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index da183dc..0fe9c75 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1162,6 +1162,22 @@ unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
return MEM_CGROUP_ZSTAT(mz, lru);
}
+unsigned long mem_cgroup_node_nr_pages(struct mem_cgroup *memcg, int nid)
+{
+ int zid;
+ struct mem_cgroup_per_zone *mz;
+ enum lru_list l;
+ u64 total = 0;
+
+ for (zid = 0; zid < MAX_NR_ZONES; zid++) {
+ mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+ for_each_lru(l)
+ total += MEM_CGROUP_ZSTAT(mz, l);
+ }
+
+ return total;
+}
+
struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
struct zone *zone)
{
@@ -4048,6 +4064,25 @@ mem_cgroup_get_total_stat(struct mem_cgroup *mem, struct mcs_total_stat *s)
mem_cgroup_get_local_stat(iter, s);
}
+static int mem_control_numa_stat_show(struct seq_file *m, void *arg)
+{
+ int nid;
+ unsigned long total_nr, nid_nr;
+ struct cgroup *cont = m->private;
+ struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont);
+
+ total_nr = mem_cgroup_local_usage(mem_cont);
+ seq_printf(m, "%lu", total_nr);
+
+ for_each_node_state(nid, N_HIGH_MEMORY) {
+ nid_nr = mem_cgroup_node_nr_pages(mem_cont, nid);
+ seq_printf(m, " N%d=%lu", nid, nid_nr);
+ }
+ seq_putc(m, '\n');
+
+ return 0;
+}
+
static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
struct cgroup_map_cb *cb)
{
@@ -4481,6 +4516,20 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
return 0;
}
+static const struct file_operations mem_control_numa_stat_file_operations = {
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int mem_control_numa_stat_open(struct inode *unused, struct file *file)
+{
+ struct cgroup *cont = file->f_dentry->d_parent->d_fsdata;
+
+ file->f_op = &mem_control_numa_stat_file_operations;
+ return single_open(file, mem_control_numa_stat_show, cont);
+}
+
static struct cftype mem_cgroup_files[] = {
{
.name = "usage_in_bytes",
@@ -4544,6 +4593,10 @@ static struct cftype mem_cgroup_files[] = {
.unregister_event = mem_cgroup_oom_unregister_event,
.private = MEMFILE_PRIVATE(_OOM_TYPE, OOM_CONTROL),
},
+ {
+ .name = "numa_stat",
+ .open = mem_control_numa_stat_open,
+ },
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
--
1.7.3.1
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