In Gridstore, also populate the tracker file (#7385)

lib/gridstore/src/gridstore.rs

@@ -590,6 +590,7 @@ impl<V> Gridstore<V> {
         for page in &self.pages {
             page.populate();
         }
+        self.tracker.read().populate();
         self.bitmask.read().populate()?;
         Ok(())
     }

lib/gridstore/src/tracker.rs

@@ -2,7 +2,7 @@ use std::path::{Path, PathBuf};
 
 use ahash::AHashMap;
 use memmap2::MmapMut;
-use memory::madvise::{Advice, AdviceSetting};
+use memory::madvise::{Advice, AdviceSetting, Madviseable};
 use memory::mmap_ops::{
     create_and_ensure_length, open_write_mmap, transmute_from_u8, transmute_to_u8,
 };
@@ -309,6 +309,10 @@ impl Tracker {
 
         pointer_opt
     }
+
+    pub fn populate(&self) {
+        self.mmap.populate();
+    }
 }
 
 #[cfg(test)]