support psi

Signed-off-by: zouyee <zouyee1989@gmail.com>

Author: zouyee

Makefile

@@ -23,4 +23,4 @@ cgutil:
 proto:
 	protobuild --quiet ${PACKAGES}
 	# Keep them Go-idiomatic and backward-compatible with the gogo/protobuf era.
-	go-fix-acronym -w -a '(Cpu|Tcp|Rss)' $(shell find cgroup1/stats/ cgroup2/stats/ -name '*.pb.go')
+	go-fix-acronym -w -a '(Cpu|Tcp|Rss|Psi)' $(shell find cgroup1/stats/ cgroup2/stats/ -name '*.pb.go')

cgroup2/manager.go

@@ -559,6 +559,7 @@ func (c *Manager) Stat() (*stats.Metrics, error) {
 		NrPeriods:     out["nr_periods"],
 		NrThrottled:   out["nr_throttled"],
 		ThrottledUsec: out["throttled_usec"],
+		PSI:           getStatPSIFromFile(filepath.Join(c.path, "cpu.pressure")),
 	}
 	metrics.Memory = &stats.MemoryStat{
 		Anon:                  out["anon"],
@@ -596,6 +597,7 @@ func (c *Manager) Stat() (*stats.Metrics, error) {
 		UsageLimit:            getStatFileContentUint64(filepath.Join(c.path, "memory.max")),
 		SwapUsage:             getStatFileContentUint64(filepath.Join(c.path, "memory.swap.current")),
 		SwapLimit:             getStatFileContentUint64(filepath.Join(c.path, "memory.swap.max")),
+		PSI:                   getStatPSIFromFile(filepath.Join(c.path, "memory.pressure")),
 	}
 	if len(memoryEvents) > 0 {
 		metrics.MemoryEvents = &stats.MemoryEvents{
@@ -606,7 +608,10 @@ func (c *Manager) Stat() (*stats.Metrics, error) {
 			OomKill: memoryEvents["oom_kill"],
 		}
 	}
-	metrics.Io = &stats.IOStat{Usage: readIoStats(c.path)}
+	metrics.Io = &stats.IOStat{
+		Usage: readIoStats(c.path),
+		PSI:   getStatPSIFromFile(filepath.Join(c.path, "io.pressure")),
+	}
 	metrics.Rdma = &stats.RdmaStat{
 		Current: rdmaStats(filepath.Join(c.path, "rdma.current")),
 		Limit:   rdmaStats(filepath.Join(c.path, "rdma.max")),