diff --git a/src/logger.rs b/src/logger.rs
index f66c3c1..60c7fb8 100644
--- a/src/logger.rs
+++ b/src/logger.rs
@@ -9,7 +9,6 @@ use tokio::{
     io::{self, AsyncBufReadExt, AsyncRead, AsyncWrite, AsyncWriteExt, BufReader, BufWriter},
     process,
     sync::mpsc,
-    task::spawn_blocking,
     time::{sleep, Duration},
 };
 
@@ -61,9 +60,9 @@ impl<'t> Logger<'t> {
 
                 use std::io::ErrorKind as K;
                 match tokio::fs::create_dir(&cg_path).await {
-                    Ok(_) => log::debug!("created dir {}", cg_path.display()),
+                    Ok(_) => debug!("created dir {}", cg_path.display()),
                     Err(e) if e.kind() == K::AlreadyExists => {
-                        log::debug!("existing dir {}", cg_path.display())
+                        debug!("existing dir {}", cg_path.display())
                     }
                     Err(e) => Err(e)?,
                 }
@@ -73,14 +72,14 @@ impl<'t> Logger<'t> {
                 };
 
                 let control_file = &cg_path.join("cgroup.subtree_control");
-                log::debug!("control file {}", control_file.display());
+                debug!("control file {}", control_file.display());
                 tokio::fs::write(control_file, b"+cpu +memory +pids +io").await?;
 
                 part = next_part;
             }
 
             let procs_file = cg_path.join("cgroup.procs");
-            log::debug!("procs file {}", procs_file.display());
+            debug!("procs file {}", procs_file.display());
             fs::write(&procs_file, b"0").await?;
         }
 
@@ -93,7 +92,7 @@ impl<'t> Logger<'t> {
 
         // forward signals
         if let Some(child_pid) = child.id() {
-            spawn_blocking(move || forward_signals_to(child_pid as i32)).await?;
+            forward_signals_to(child_pid as i32);
         }
 
         // handle output
@@ -166,29 +165,28 @@ impl<'t> Logger<'t> {
             .open(log_file)
             .await?;
 
-        let link_src = &format!(
-            "{path}/{name}.log",
-            path = self.log_path,
-            name = self.log_name
-        );
-        let link_tgt = log_file
-            .strip_prefix(&format!("{}/", self.log_path))
-            .unwrap_or(log_file);
+        let link_src = &PathBuf::from(self.log_path)
+            .join(self.log_name)
+            .with_added_extension("log");
+        let link_tgt = &self.archive_rel_path(ts);
 
         let _ = fs::remove_file(link_src).await;
-        fs::symlink(link_tgt, link_src)
-            .await
-            .map_err(|e| format_err!("symlink {link_src} -> {link_tgt} failed: {e}",))?;
+        fs::symlink(link_tgt, link_src).await.map_err(|e| {
+            format_err!(
+                "symlink {s} -> {t} failed: {e}",
+                s = link_src.display(),
+                t = link_tgt.display()
+            )
+        })?;
 
         Ok(file)
     }
 
-    fn archive_path(&self, ts: Timestamp) -> String {
-        format!(
-            "{path}/archives/{file}",
-            path = self.log_path,
-            file = self.archive_file(ts)
-        )
+    fn archive_path(&self, ts: Timestamp) -> PathBuf {
+        PathBuf::from(self.log_path).join(self.archive_rel_path(ts))
+    }
+    fn archive_rel_path(&self, ts: Timestamp) -> PathBuf {
+        PathBuf::from("archives").join(self.archive_file(ts))
     }
     fn archive_file(&self, ts: Timestamp) -> String {
         format!(
@@ -206,7 +204,7 @@ fn forward_signals_to(pid: i32) {
     };
     use signal_hook::{consts::*, low_level::register};
 
-    log::debug!("forwarding signals to pid {pid}");
+    debug!("forwarding signals to pid {pid}");
 
     let pid = Pid::from_raw(pid);
     let signals = [
@@ -219,7 +217,7 @@ fn forward_signals_to(pid: i32) {
         };
         unsafe {
             register(sig, move || {
-                log::debug!("forwarding {signal} to {pid}");
+                debug!("forwarding {signal} to {pid}");
                 let _ = kill(pid, signal);
             })
             .ok();
@@ -319,7 +317,7 @@ async fn compress(path: impl AsRef<Path>) {
         let mut out = ZstdEncoder::new(out);
         async {
             tokio::io::copy(&mut input, &mut out).await?;
-            out.flush().await
+            out.shutdown().await
         }
         .await
         .map_err(|e| format_err!("compression of {path_str} failed: {e}"))?;
@@ -336,8 +334,9 @@ async fn compress(path: impl AsRef<Path>) {
 }
 
 pub fn parse_ts(ts: &str) -> std::result::Result<Timestamp, chrono::ParseError> {
-    let dt =
-        chrono::NaiveDateTime::parse_from_str(&format!("{ts}0000"), &format!("{TS_FORMAT}%M%S"))?;
+    let format = &format!("{TS_FORMAT}%M%S");
+    let full_ts = &format!("{ts}0000");
+    let dt = chrono::NaiveDateTime::parse_from_str(full_ts, format)?;
     Ok(Timestamp::from_naive_utc_and_offset(dt, Utc))
 }
 
@@ -389,16 +388,27 @@ pub async fn log_files(log_path: &str, log_name: &str) -> fs::Result<Vec<LogFile
     Ok(entries)
 }
 
-#[derive(Debug, PartialEq, Eq, Ord)]
+#[derive(Debug)]
 pub struct LogFile {
     pub path: PathBuf,
     pub compressed: bool,
     pub timestamp: Timestamp,
 }
 
+impl Eq for LogFile {}
+impl PartialEq for LogFile {
+    fn eq(&self, other: &Self) -> bool {
+        self.timestamp == other.timestamp
+    }
+}
+impl Ord for LogFile {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.timestamp.cmp(&other.timestamp)
+    }
+}
 impl PartialOrd for LogFile {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        self.timestamp.partial_cmp(&other.timestamp)
+        Some(self.cmp(other))
     }
 }