Add min_free_kbytes and reclaim_wmarks APIs per memory cgroup.
The first one is to adjust the internal low/high wmark calculation
and the second one is to export the wmarks.
$ echo 1024 >/dev/cgroup/A/memory.min_free_kbytes
$ cat /dev/cgroup/A/memory.reclaim_wmarks
low_wmark 98304000
high_wmark 81920000
Signed-off-by: Ying Han <yinghan@xxxxxxxxxx>
---
mm/memcontrol.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5508d94..6ef26a7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4122,6 +4122,33 @@ static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft,
return 0;
}
+static u64 mem_cgroup_min_free_read(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+
+ return get_min_free_kbytes(memcg);
+}
+
+static int mem_cgroup_min_free_write(struct cgroup *cgrp, struct cftype *cfg,
+ u64 val)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent;
+
+ if (cgrp->parent == NULL)
+ return -EINVAL;
+
+ parent = mem_cgroup_from_cont(cgrp->parent);
+
+ spin_lock(&memcg->reclaim_param_lock);
+ memcg->min_free_kbytes = val;
+ spin_unlock(&memcg->reclaim_param_lock);
+
+ setup_per_memcg_wmarks(memcg);
+ return 0;
+
+}
+
static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap)
{
struct mem_cgroup_threshold_ary *t;
@@ -4413,6 +4440,21 @@ static void mem_cgroup_oom_unregister_event(struct cgroup *cgrp,
mutex_unlock(&memcg_oom_mutex);
}
+static int mem_cgroup_wmark_read(struct cgroup *cgrp,
+ struct cftype *cft, struct cgroup_map_cb *cb)
+{
+ struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp);
+ u64 low_wmark, high_wmark;
+
+ low_wmark = res_counter_read_u64(&mem->res, RES_LOW_WMARK_LIMIT);
+ high_wmark = res_counter_read_u64(&mem->res, RES_HIGH_WMARK_LIMIT);
+
+ cb->fill(cb, "low_wmark", low_wmark);
+ cb->fill(cb, "high_wmark", high_wmark);
+
+ return 0;
+}
+
static int mem_cgroup_oom_control_read(struct cgroup *cgrp,
struct cftype *cft, struct cgroup_map_cb *cb)
{
@@ -4623,6 +4665,15 @@ static struct cftype mem_cgroup_files[] = {
.write_string = mem_cgroup_dirty_write_string,
.private = MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES,
},
+ {
+ .name = "min_free_kbytes",
+ .write_u64 = mem_cgroup_min_free_write,
+ .read_u64 = mem_cgroup_min_free_read,
+ },
+ {
+ .name = "reclaim_wmarks",
+ .read_map = mem_cgroup_wmark_read,
+ },
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
--
1.7.3.1
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