pkg/cmdprof: merge into pkg/tool

cmdprof functionality seems to fit well into pkg/tool.

1 files changed, 44 insertions, 0 deletions

diff --git a/pkg/tool/cmdprof.go b/pkg/tool/cmdprof.go
new file mode 100644
index 000000000..196a0cd24
--- /dev/null
+++ b/pkg/tool/cmdprof.go
@@ -0,0 +1,44 @@
+// Copyright 2020 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package tool
+
+import (
+	"os"
+	"runtime"
+	"runtime/pprof"
+)
+
+// installProfiling simplifies cpu/memory profiling for command line tools.
+func installProfiling(cpuprof, memprof string) func() {
+	res := func() {}
+	if cpuprof != "" {
+		f, err := os.Create(cpuprof)
+		if err != nil {
+			Failf("failed to create cpuprofile file: %v", err)
+		}
+		if err := pprof.StartCPUProfile(f); err != nil {
+			Failf("failed to start cpu profile: %v", err)
+		}
+		res = func() {
+			pprof.StopCPUProfile()
+			f.Close()
+		}
+	}
+	if memprof != "" {
+		prev := res
+		res = func() {
+			prev()
+			f, err := os.Create(memprof)
+			if err != nil {
+				Failf("failed to create memprofile file: %v", err)
+			}
+			defer f.Close()
+			runtime.GC()
+			if err := pprof.WriteHeapProfile(f); err != nil {
+				Failf("failed to write mem profile: %v", err)
+			}
+		}
+	}
+	return res
+}