From: Lu Jialin lujialin4@huawei.com
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4X0YD?from=project-issue CVE: NA
--------
Export "memory.events" and "memory.events.local" from cgroupv2 to cgroupv1.
There are some differences between v2 and v1:
1)events of MEMCG_OOM_GROUP_KILL is not included in cgroupv1. Because, there is no member of memory.oom.group.
2)events of MEMCG_MAX is represented with "limit_in_bytes" in cgroupv1 instead of memory.max
3)event of oom_kill is include in memory.oom_control. make oom_kill include its descendants' events and add oom_kill_local include its oom_kill event only.
Signed-off-by: Lu Jialin lujialin4@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- include/linux/memcontrol.h | 2 -- mm/memcontrol.c | 40 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+), 2 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 0e55013c570d..23f4a3c8fef1 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1214,8 +1214,6 @@ static inline void memcg_memory_event(struct mem_cgroup *memcg, else cgroup_file_notify(&memcg->events_file);
- if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) - break; if (cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS) break; } while ((memcg = parent_mem_cgroup(memcg)) && diff --git a/mm/memcontrol.c b/mm/memcontrol.c index daed900a666e..c1ff95b7a82d 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4564,6 +4564,9 @@ static int mem_cgroup_oom_control_read(struct seq_file *sf, void *v) seq_printf(sf, "under_oom %d\n", (bool)memcg->under_oom); seq_printf(sf, "oom_kill %lu\n", atomic_long_read(&memcg->memory_events[MEMCG_OOM_KILL])); + seq_printf(sf, "oom_kill_local %lu\n", + atomic_long_read(&memcg->memory_events_local[MEMCG_OOM_KILL])); + return 0; }
@@ -5124,6 +5127,31 @@ static ssize_t memory_high_write(struct kernfs_open_file *of, return nbytes; }
+static void __memcg_events_show(struct seq_file *m, atomic_long_t *events) +{ + seq_printf(m, "low %lu\n", atomic_long_read(&events[MEMCG_LOW])); + seq_printf(m, "high %lu\n", atomic_long_read(&events[MEMCG_HIGH])); + seq_printf(m, "limit_in_bytes %lu\n", + atomic_long_read(&events[MEMCG_MAX])); + seq_printf(m, "oom %lu\n", atomic_long_read(&events[MEMCG_OOM])); +} + +static int memcg_events_show(struct seq_file *m, void *v) +{ + struct mem_cgroup *memcg = mem_cgroup_from_seq(m); + + __memcg_events_show(m, memcg->memory_events); + return 0; +} + +static int memcg_events_local_show(struct seq_file *m, void *v) +{ + struct mem_cgroup *memcg = mem_cgroup_from_seq(m); + + __memcg_events_show(m, memcg->memory_events_local); + return 0; +} + static struct cftype mem_cgroup_legacy_files[] = { { .name = "usage_in_bytes", @@ -5305,6 +5333,18 @@ static struct cftype mem_cgroup_legacy_files[] = { .seq_show = memory_high_show, .write = memory_high_write, }, + { + .name = "events", + .flags = CFTYPE_NOT_ON_ROOT, + .file_offset = offsetof(struct mem_cgroup, events_file), + .seq_show = memcg_events_show, + }, + { + .name = "events.local", + .flags = CFTYPE_NOT_ON_ROOT, + .file_offset = offsetof(struct mem_cgroup, events_local_file), + .seq_show = memcg_events_local_show, + }, { }, /* terminate */ };