[WIP][DNM] Add support for updating oom_score_adj

go.mod

@@ -39,3 +39,5 @@ require (
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/vishvananda/netns v0.0.4 // indirect
 )
+
+replace github.com/opencontainers/runtime-spec v1.2.1 => github.com/Karthik-K-N/runtime-spec v0.0.0-20250310091823-a5fba8a48c25

go.sum

@@ -1,4 +1,6 @@
 github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/Karthik-K-N/runtime-spec v0.0.0-20250310091823-a5fba8a48c25 h1:f0CPE05qGTPCd7U44s0+bhr/tbGs1FYz/rtELxvjxjw=
+github.com/Karthik-K-N/runtime-spec v0.0.0-20250310091823-a5fba8a48c25/go.mod h1:9tp5Ly3OaIUitPDTBTBrOFWw19vXQHlQd5iMm0wPjic=
 github.com/checkpoint-restore/go-criu/v6 v6.3.0 h1:mIdrSO2cPNWQY1truPg6uHLXyKHk3Z5Odx4wjKOASzA=
 github.com/checkpoint-restore/go-criu/v6 v6.3.0/go.mod h1:rrRTN/uSwY2X+BPRl/gkulo9gsKOSAeVp9/K2tv7xZI=
 github.com/cilium/ebpf v0.17.3 h1:FnP4r16PWYSE4ux6zN+//jMcW4nMVRvuTLVTvCjyyjg=
@@ -51,8 +53,6 @@ github.com/mrunalp/fileutils v0.5.1 h1:F+S7ZlNKnrwHfSwdlgNSkKo67ReVf8o9fel6C3dkm
 github.com/mrunalp/fileutils v0.5.1/go.mod h1:M1WthSahJixYnrXQl/DFQuteStB1weuxD2QJNHXfbSQ=
 github.com/opencontainers/cgroups v0.0.1 h1:MXjMkkFpKv6kpuirUa4USFBas573sSAY082B4CiHEVA=
 github.com/opencontainers/cgroups v0.0.1/go.mod h1:s8lktyhlGUqM7OSRL5P7eAW6Wb+kWPNvt4qvVfzA5vs=
-github.com/opencontainers/runtime-spec v1.2.1 h1:S4k4ryNgEpxW1dzyqffOmhI1BHYcjzU8lpJfSlR0xww=
-github.com/opencontainers/runtime-spec v1.2.1/go.mod h1:jwyrGlmzljRJv/Fgzds9SsS/C5hL+LL3ko9hs6T5lQ0=
 github.com/opencontainers/selinux v1.11.1 h1:nHFvthhM0qY8/m+vfhJylliSshm8G1jJ2jDMcgULaH8=
 github.com/opencontainers/selinux v1.11.1/go.mod h1:E5dMC3VPuVvVHDYmi78qvhJp8+M586T4DlDRYpFkyec=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

libcontainer/container_linux.go

@@ -171,6 +171,16 @@ func (c *Container) Set(config configs.Config) error {
 	if status == Stopped {
 		return ErrNotRunning
 	}
+
+	// Set the oom_score_adj value
+	if config.OomScoreAdj != nil && *config.OomScoreAdj != 0 {
+		if c.hasInit() {
+			if err := os.WriteFile(fmt.Sprintf("/proc/%d/oom_score_adj", c.initProcess.pid()), []byte(strconv.Itoa(*config.OomScoreAdj)), unix.O_WRONLY); err != nil {
+				return err
+			}
+		}
+	}
+
 	if err := c.cgroupManager.Set(config.Cgroups.Resources); err != nil {
 		// Set configs back
 		if err2 := c.cgroupManager.Set(c.config.Cgroups.Resources); err2 != nil {

update.go

@@ -54,7 +54,8 @@ The accepted format is as follow (unchanged values can be omitted):
   },
   "blockIO": {
     "weight": 0
-  }
+  },
+  "oomScoreAdj": 0
 }
 
 Note: if data is to be read from a file or the standard input, all
@@ -136,6 +137,10 @@ other options are ignored.
 			Name:  "mem-bw-schema",
 			Usage: "The string of Intel RDT/MBA memory bandwidth schema",
 		},
+		cli.StringFlag{
+			Name:  "oom-score-adj",
+			Usage: "oom score adj value",
+		},
 	},
 	Action: func(context *cli.Context) error {
 		if err := checkArgs(context, 1, exactArgs); err != nil {
@@ -177,6 +182,8 @@ other options are ignored.
 			if err != nil {
 				return err
 			}
+			aJSON, _ := json.Marshal(r)
+			fmt.Println("Passed resources are", string(aJSON))
 		} else {
 			if val := context.Int("blkio-weight"); val != 0 {
 				r.BlockIO.Weight = u16Ptr(uint16(val))
@@ -253,6 +260,10 @@ other options are ignored.
 			}
 
 			r.Pids.Limit = int64(context.Int("pids-limit"))
+
+			if oomScoreAdj := context.Int("oom-score-adj"); oomScoreAdj != 0 {
+				r.OOMScoreAdj = &oomScoreAdj
+			}
 		}
 
 		// Fix up values
@@ -378,6 +389,10 @@ other options are ignored.
 		// Note this field is not saved into container's state.json.
 		config.Cgroups.SkipDevices = true
 
+		if r.OOMScoreAdj != nil {
+			config.OomScoreAdj = r.OOMScoreAdj
+		}
+
 		return container.Set(config)
 	},
 }

vendor/modules.txt

@@ -62,7 +62,7 @@ github.com/opencontainers/cgroups/fscommon
 github.com/opencontainers/cgroups/internal/path
 github.com/opencontainers/cgroups/manager
 github.com/opencontainers/cgroups/systemd
-# github.com/opencontainers/runtime-spec v1.2.1
+# github.com/opencontainers/runtime-spec v1.2.1 => github.com/Karthik-K-N/runtime-spec v0.0.0-20250310091823-a5fba8a48c25
 ## explicit
 github.com/opencontainers/runtime-spec/specs-go
 github.com/opencontainers/runtime-spec/specs-go/features