tools/syz-env: restrict Makefile parallelism based on RAM

Ensure that we have at least 1GB per Makefile job.
Go compiler/linker can consume significant amount of memory
(observed to consume at least 600MB). See #1276 for context.
Update #1276

6 files changed, 26 insertions, 0 deletions

diff --git a/pkg/osutil/osutil_akaros.go b/pkg/osutil/osutil_akaros.go
index bcc285748..bc5b68b6a 100644
--- a/pkg/osutil/osutil_akaros.go
+++ b/pkg/osutil/osutil_akaros.go
@@ -17,6 +17,10 @@ func RemoveAll(dir string) error {
 	return os.RemoveAll(dir)
 }
 
+func SystemMemorySize() uint64 {
+	return 0
+}
+
 func prolongPipe(r, w *os.File) {
 }
 
diff --git a/pkg/osutil/osutil_bsd.go b/pkg/osutil/osutil_bsd.go
index 1f5cf6be8..bf97ae73b 100644
--- a/pkg/osutil/osutil_bsd.go
+++ b/pkg/osutil/osutil_bsd.go
@@ -14,6 +14,10 @@ func RemoveAll(dir string) error {
 	return os.RemoveAll(dir)
 }
 
+func SystemMemorySize() uint64 {
+	return 0
+}
+
 func prolongPipe(r, w *os.File) {
 }
 
diff --git a/pkg/osutil/osutil_darwin.go b/pkg/osutil/osutil_darwin.go
index bf6ba9810..68cd81da6 100644
--- a/pkg/osutil/osutil_darwin.go
+++ b/pkg/osutil/osutil_darwin.go
@@ -14,6 +14,10 @@ func RemoveAll(dir string) error {
 	return os.RemoveAll(dir)
 }
 
+func SystemMemorySize() uint64 {
+	return 0
+}
+
 func prolongPipe(r, w *os.File) {
 }
 
diff --git a/pkg/osutil/osutil_fuchsia.go b/pkg/osutil/osutil_fuchsia.go
index dc0ad5ddc..6ef2b08b2 100644
--- a/pkg/osutil/osutil_fuchsia.go
+++ b/pkg/osutil/osutil_fuchsia.go
@@ -18,6 +18,10 @@ func RemoveAll(dir string) error {
 	return os.RemoveAll(dir)
 }
 
+func SystemMemorySize() uint64 {
+	return 0
+}
+
 func CreateMemMappedFile(size int) (f *os.File, mem []byte, err error) {
 	return nil, nil, fmt.Errorf("CreateMemMappedFile is not implemented")
 }
diff --git a/pkg/osutil/osutil_linux.go b/pkg/osutil/osutil_linux.go
index 732d8e4c2..eee0a9009 100644
--- a/pkg/osutil/osutil_linux.go
+++ b/pkg/osutil/osutil_linux.go
@@ -38,6 +38,12 @@ func RemoveAll(dir string) error {
 	return nil
 }
 
+func SystemMemorySize() uint64 {
+	var info syscall.Sysinfo_t
+	syscall.Sysinfo(&info)
+	return info.Totalram
+}
+
 func removeImmutable(fname string) error {
 	// Reset FS_XFLAG_IMMUTABLE/FS_XFLAG_APPEND.
 	fd, err := syscall.Open(fname, syscall.O_RDONLY, 0)
diff --git a/pkg/osutil/osutil_windows.go b/pkg/osutil/osutil_windows.go
index a7cdb1c4f..d98a9d33c 100644
--- a/pkg/osutil/osutil_windows.go
+++ b/pkg/osutil/osutil_windows.go
@@ -19,6 +19,10 @@ func RemoveAll(dir string) error {
 	return os.RemoveAll(dir)
 }
 
+func SystemMemorySize() uint64 {
+	return 0
+}
+
 func prolongPipe(r, w *os.File) {
 }