cache account hash info (#19426)

* cache account hash info

* ledger_path -> accounts_hash_cache_path

runtime/src/cache_hash_data_stats.rs

@@ -0,0 +1,59 @@
+//! Cached data for hashing accounts
+#[derive(Default, Debug)]
+pub struct CacheHashDataStats {
+    pub cache_file_size: usize,
+    pub cache_file_count: usize,
+    pub total_entries: usize,
+    pub loaded_from_cache: usize,
+    pub entries_loaded_from_cache: usize,
+    pub save_us: u64,
+    pub saved_to_cache: usize,
+    pub write_to_mmap_us: u64,
+    pub create_save_us: u64,
+    pub load_us: u64,
+    pub read_us: u64,
+    pub decode_us: u64,
+    pub merge_us: u64,
+    pub unused_cache_files: usize,
+}
+
+impl CacheHashDataStats {
+    pub fn merge(&mut self, other: &CacheHashDataStats) {
+        self.cache_file_size += other.cache_file_size;
+        self.total_entries += other.total_entries;
+        self.loaded_from_cache += other.loaded_from_cache;
+        self.entries_loaded_from_cache += other.entries_loaded_from_cache;
+        self.load_us += other.load_us;
+        self.read_us += other.read_us;
+        self.decode_us += other.decode_us;
+        self.save_us += other.save_us;
+        self.saved_to_cache += other.saved_to_cache;
+        self.create_save_us += other.create_save_us;
+        self.cache_file_count += other.cache_file_count;
+        self.write_to_mmap_us += other.write_to_mmap_us;
+        self.unused_cache_files += other.unused_cache_files;
+    }
+
+    pub fn report(&self) {
+        datapoint_info!(
+            "cache_hash_data_stats",
+            ("cache_file_size", self.cache_file_size, i64),
+            ("cache_file_count", self.cache_file_count, i64),
+            ("total_entries", self.total_entries, i64),
+            ("loaded_from_cache", self.loaded_from_cache, i64),
+            ("saved_to_cache", self.saved_to_cache, i64),
+            (
+                "entries_loaded_from_cache",
+                self.entries_loaded_from_cache,
+                i64
+            ),
+            ("save_us", self.save_us, i64),
+            ("write_to_mmap_us", self.write_to_mmap_us, i64),
+            ("create_save_us", self.create_save_us, i64),
+            ("load_us", self.load_us, i64),
+            ("read_us", self.read_us, i64),
+            ("decode_us", self.decode_us, i64),
+            ("unused_cache_files", self.unused_cache_files, i64),
+        );
+    }
+}