Present maximum used memory in cgroup memory.current_max.
Signed-off-by: Topi Miettinen <toiwoton@xxxxxxxxx>
---
include/linux/page_counter.h | 7 ++++++-
mm/memcontrol.c | 13 +++++++++++++
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/include/linux/page_counter.h b/include/linux/page_counter.h
index 7e62920..be4de17 100644
--- a/include/linux/page_counter.h
+++ b/include/linux/page_counter.h
@@ -9,9 +9,9 @@ struct page_counter {
atomic_long_t count;
unsigned long limit;
struct page_counter *parent;
+ unsigned long watermark;
/* legacy */
- unsigned long watermark;
unsigned long failcnt;
};
@@ -34,6 +34,11 @@ static inline unsigned long page_counter_read(struct page_counter *counter)
return atomic_long_read(&counter->count);
}
+static inline unsigned long page_counter_read_watermark(struct page_counter *counter)
+{
+ return counter->watermark;
+}
+
void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages);
void page_counter_charge(struct page_counter *counter, unsigned long nr_pages);
bool page_counter_try_charge(struct page_counter *counter,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 75e7440..5513771 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4966,6 +4966,14 @@ static u64 memory_current_read(struct cgroup_subsys_state *css,
return (u64)page_counter_read(&memcg->memory) * PAGE_SIZE;
}
+static u64 memory_current_max_read(struct cgroup_subsys_state *css,
+ struct cftype *cft)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_css(css);
+
+ return (u64)page_counter_read_watermark(&memcg->memory) * PAGE_SIZE;
+}
+
static int memory_low_show(struct seq_file *m, void *v)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
@@ -5179,6 +5187,11 @@ static struct cftype memory_files[] = {
.read_u64 = memory_current_read,
},
{
+ .name = "current_max",
+ .flags = CFTYPE_NOT_ON_ROOT,
+ .read_u64 = memory_current_max_read,
+ },
+ {
.name = "low",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = memory_low_show,
--
2.8.1
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