memfd experiment did not yield perf gains on Linuxjarred/fix-bunbun-on-wsl

I suspect the reason why is because we were already using tmpfs. So it was already writing to an in-memory file. O_TMPFILE doesn't seem to do anything for us either here.

2 files changed, 4 insertions, 5 deletions

diff --git a/src/bundler.zig b/src/bundler.zig
index 89c37e9ab..2ca075760 100644
--- a/src/bundler.zig
+++ b/src/bundler.zig
@@ -700,7 +700,7 @@ pub const Bundler = struct {
             const tmpname = try bundler.fs.tmpname(
                 ".bun",
                 std.mem.span(&tmpname_buf),
-                std.hash.Wyhash.hash(0, std.mem.span(destination)),
+                std.hash.Wyhash.hash(@intCast(usize, std.time.milliTimestamp()) % std.math.maxInt(u32), std.mem.span(destination)),
             );
 
             var tmpfile = Fs.FileSystem.RealFS.Tmpfile{};
diff --git a/src/fs.zig b/src/fs.zig
index 75d01149d..0b28fa9b7 100644
--- a/src/fs.zig
+++ b/src/fs.zig
@@ -534,12 +534,11 @@ pub const FileSystem = struct {
             }
 
             pub fn create(this: *Tmpfile, rfs: *RealFS, name: [*:0]const u8) !void {
-                var tmpdir_ = if (Environment.isLinux) try rfs.openDir(rfs.parent_fs.top_level_dir) else try rfs.openTmpDir();
+                var tmpdir_ = try rfs.openTmpDir();
 
-                const default_flags = std.os.O_CREAT | std.os.O_RDWR | std.os.O_CLOEXEC;
-                const flags = if (Environment.isLinux) default_flags | std.os.O_TMPFILE else default_flags | std.os.O_EXCL;
+                const flags = std.os.O_CREAT | std.os.O_RDWR | std.os.O_CLOEXEC;
                 this.dir_fd = tmpdir_.fd;
-                this.fd = try std.os.openatZ(tmpdir_.fd, name, flags, 0666);
+                this.fd = try std.os.openatZ(tmpdir_.fd, name, flags, std.os.S_IRWXO);
             }
 
             pub fn promote(this: *Tmpfile, from_name: [*:0]const u8, destination_fd: std.os.fd_t, name: [*:0]const u8) !void {