madvise

1 files changed, 12 insertions, 0 deletions

diff --git a/pack_pack.go b/pack_pack.go
index 75cd282e..fb2d965e 100644
--- a/pack_pack.go
+++ b/pack_pack.go
@@ -533,6 +533,18 @@ func openPackFile(absPath, rel string) (*packFile, error) {
 		_ = syscall.Munmap(region)
 		return nil, err
 	}
+
+	err = syscall.Madvise(region, syscall.MADV_RANDOM)
+	if err != nil {
+		_ = syscall.Munmap(region)
+		return nil, err
+	}
+	err = syscall.Madvise(region, syscall.MADV_WILLNEED)
+	if err != nil {
+		_ = syscall.Munmap(region)
+		return nil, err
+	}
+
 	return &packFile{
 		relPath: rel,
 		size:    stat.Size(),