Increase cache housekeeping interval

Author: nuclearcat

README.md

@@ -5,6 +5,7 @@ It supports multiple backends: Azure Blob Storage and local filesystem, to provi
 It caches the files in a local directory and serves them from there.
 Range requests are supported, but only for start offset, end limit is not implemented yet.
 Files are protected by upload locking to prevent concurrent uploads to the same path.
+To limit disk usage, a background housekeeping loop samples disk space every five minutes and deletes the oldest cached files (older than an hour) whenever free space drops below 12%.
 
 ## Configuration
 

docs/_index.md

@@ -90,7 +90,7 @@ curl https://files.kernelci.org/metrics
 
 - **JWT Authentication**: Secure token-based authentication for uploads
 - **Multiple Storage Backends**: Currently supports Azure Blob Storage with extensible driver architecture
-- **Local Caching**: Files are cached locally with automatic cleanup when disk space is low
+- **Local Caching**: Files are cached locally with automatic cleanup when disk space is low; disk space is sampled every five minutes and the least recently updated cached files older than an hour are removed until space recovers
 - **Range Request Support**: Partial content downloads using HTTP range requests
 - **File Locking**: Prevents concurrent uploads to the same file path
 - **Prometheus Metrics**: System monitoring and metrics collection

src/storcaching.rs

@@ -125,8 +125,8 @@ pub async fn cache_loop(cache_dir: &str) {
             tokio::time::sleep(Duration::from_millis(100)).await;
         } else {
             debug_log!("Free disk space: {}%", free_space);
-            // normal mode, sleep 10 seconds
-            tokio::time::sleep(Duration::from_secs(10)).await;
+            // normal mode, sleep 5 minutes between samples
+            tokio::time::sleep(Duration::from_secs(300)).await;
         }
     }
 }