From 8276db2ebe5a9d7124287d208413aac93c3e59ac Mon Sep 17 00:00:00 2001
From: Serge Logvinov <serge.logvinov@sinextra.dev>
Date: Thu, 2 Dec 2021 19:01:29 +0200
Subject: [PATCH] feat: add memory.min param

It helps to configure memory.min cgroup parameter.

Signed-off-by: Serge Logvinov <serge.logvinov@sinextra.dev>
---
 v2/manager.go       | 5 +++++
 v2/memory.go        | 7 +++++++
 v2/memoryv2_test.go | 2 ++
 3 files changed, 14 insertions(+)

diff --git a/v2/manager.go b/v2/manager.go
index c08d9a7d..240a0ad0 100644
--- a/v2/manager.go
+++ b/v2/manager.go
@@ -761,6 +761,11 @@ func NewSystemd(slice, group string, pid int, resources *Resources) (*Manager, e
 		properties = append(properties, newSystemdProperty("PIDs", []uint32{uint32(pid)}))
 	}
 
+	if resources.Memory != nil && resources.Memory.Min != nil && *resources.Memory.Min != 0 {
+		properties = append(properties,
+			newSystemdProperty("MemoryMin", uint64(*resources.Memory.Min)))
+	}
+
 	if resources.Memory != nil && resources.Memory.Max != nil && *resources.Memory.Max != 0 {
 		properties = append(properties,
 			newSystemdProperty("MemoryMax", uint64(*resources.Memory.Max)))
diff --git a/v2/memory.go b/v2/memory.go
index 72f94b73..6f4733be 100644
--- a/v2/memory.go
+++ b/v2/memory.go
@@ -18,6 +18,7 @@ package v2
 
 type Memory struct {
 	Swap *int64
+	Min  *int64
 	Max  *int64
 	Low  *int64
 	High *int64
@@ -30,6 +31,12 @@ func (r *Memory) Values() (o []Value) {
 			value:    *r.Swap,
 		})
 	}
+	if r.Min != nil {
+		o = append(o, Value{
+			filename: "memory.min",
+			value:    *r.Min,
+		})
+	}
 	if r.Max != nil {
 		o = append(o, Value{
 			filename: "memory.max",
diff --git a/v2/memoryv2_test.go b/v2/memoryv2_test.go
index 58703a95..ada7c641 100644
--- a/v2/memoryv2_test.go
+++ b/v2/memoryv2_test.go
@@ -56,6 +56,7 @@ func TestSystemdCgroupMemoryController(t *testing.T) {
 	group := fmt.Sprintf("testing-memory-%d.scope", os.Getpid())
 	res := Resources{
 		Memory: &Memory{
+			Min: pointerInt64(16384),
 			Max: pointerInt64(629145600),
 		},
 	}
@@ -63,5 +64,6 @@ func TestSystemdCgroupMemoryController(t *testing.T) {
 	if err != nil {
 		t.Fatal("failed to init new cgroup systemd manager: ", err)
 	}
+	checkFileContent(t, c.path, "memory.min", "16384")
 	checkFileContent(t, c.path, "memory.max", "629145600")
 }