diff options
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 7 | ||||
| -rw-r--r-- | mm/memcontrol.c | 13 |
2 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index f67c0829350b..1ffe019483ac 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1582,6 +1582,13 @@ PAGE_SIZE multiple when read back. Healthy workloads are not expected to reach this limit. + memory.swap.peak + A read-only single value file which exists on non-root + cgroups. + + The max swap usage recorded for the cgroup and its + descendants since the creation of the cgroup. + memory.swap.max A read-write single value file which exists on non-root cgroups. The default is "max". diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 6a3d4ce87b8a..6ee433be4c3b 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -7622,6 +7622,14 @@ static u64 swap_current_read(struct cgroup_subsys_state *css, return (u64)page_counter_read(&memcg->swap) * PAGE_SIZE; } +static u64 swap_peak_read(struct cgroup_subsys_state *css, + struct cftype *cft) +{ + struct mem_cgroup *memcg = mem_cgroup_from_css(css); + + return (u64)memcg->swap.watermark * PAGE_SIZE; +} + static int swap_high_show(struct seq_file *m, void *v) { return seq_puts_memcg_tunable(m, @@ -7701,6 +7709,11 @@ static struct cftype swap_files[] = { .write = swap_max_write, }, { + .name = "swap.peak", + .flags = CFTYPE_NOT_ON_ROOT, + .read_u64 = swap_peak_read, + }, + { .name = "swap.events", .flags = CFTYPE_NOT_ON_ROOT, .file_offset = offsetof(struct mem_cgroup, swap_events_file), |