diff --git a/src/llama-mmap.cpp b/src/llama-mmap.cpp
index 58c4437604..4d183cbc9c 100644
--- a/src/llama-mmap.cpp
+++ b/src/llama-mmap.cpp
@@ -440,8 +440,8 @@ void llama_file::write_u32(uint32_t val) const { pimpl->write_u32(val); }
 
 #if defined(_POSIX_MAPPED_FILES) || defined(_WIN32)
 // merge `ranges` and return their complement within [0, limit)
-static std::vector<std::pair<size_t, size_t>> ranges_complement(std::vector<std::pair<size_t, size_t>> ranges, size_t limit) {
-    std::vector<std::pair<size_t, size_t>> res;
+static llama_mmap::ranges ranges_complement(llama_mmap::ranges ranges, size_t limit) {
+    llama_mmap::ranges res;
     std::sort(ranges.begin(), ranges.end());
 
     size_t pos = 0;
@@ -465,7 +465,7 @@ struct llama_mmap::impl {
 #ifdef _POSIX_MAPPED_FILES
     std::vector<std::pair<size_t, size_t>> mapped_fragments;
 
-    impl(struct llama_file * file, size_t prefetch, bool numa, const std::vector<std::pair<size_t, size_t>> & lazy_ranges) {
+    impl(struct llama_file * file, size_t prefetch, bool numa, const llama_mmap::ranges & lazy_ranges) {
         size = file->size();
         int fd = file->file_id();
         int flags = MAP_SHARED;
@@ -572,7 +572,7 @@ struct llama_mmap::impl {
 #elif defined(_WIN32)
     HANDLE hMapping = nullptr;
 
-    impl(struct llama_file * file, size_t prefetch, bool numa, const std::vector<std::pair<size_t, size_t>> & lazy_ranges) {
+    impl(struct llama_file * file, size_t prefetch, bool numa, const llama_mmap::ranges & lazy_ranges) {
         GGML_UNUSED(numa);
 
         size = file->size();
@@ -641,7 +641,7 @@ struct llama_mmap::impl {
         }
     }
 #else
-    impl(struct llama_file * file, size_t prefetch, bool numa, const std::vector<std::pair<size_t, size_t>> & lazy_ranges) {
+    impl(struct llama_file * file, size_t prefetch, bool numa, const llama_mmap::ranges & lazy_ranges) {
         GGML_UNUSED(file);
         GGML_UNUSED(prefetch);
         GGML_UNUSED(numa);
@@ -663,7 +663,7 @@ struct llama_mmap::impl {
 };
 
 llama_mmap::llama_mmap(struct llama_file * file, size_t prefetch, bool numa,
-        const std::vector<std::pair<size_t, size_t>> & lazy_ranges) : pimpl(std::make_unique<impl>(file, prefetch, numa, lazy_ranges)) {}
+        const ranges & lazy_ranges) : pimpl(std::make_unique<impl>(file, prefetch, numa, lazy_ranges)) {}
 llama_mmap::~llama_mmap() = default;
 
 size_t llama_mmap::size() const { return pimpl->size; }
diff --git a/src/llama-mmap.h b/src/llama-mmap.h
index bd67e7c002..cc28c8a73f 100644
--- a/src/llama-mmap.h
+++ b/src/llama-mmap.h
@@ -42,9 +42,12 @@ private:
 };
 
 struct llama_mmap {
+    // list of [first, last) byte ranges within a file
+    using ranges = std::vector<std::pair<size_t, size_t>>;
+
     llama_mmap(const llama_mmap &) = delete;
     llama_mmap(struct llama_file * file, size_t prefetch = (size_t) -1, bool numa = false,
-               const std::vector<std::pair<size_t, size_t>> & lazy_ranges = {});
+               const ranges & lazy_ranges = {});
     ~llama_mmap();
 
     size_t size() const;
diff --git a/src/llama-model-loader.cpp b/src/llama-model-loader.cpp
index 9db3140647..2f1a09a19a 100644
--- a/src/llama-model-loader.cpp
+++ b/src/llama-model-loader.cpp
@@ -1288,6 +1288,9 @@ struct ggml_tensor * llama_model_loader::create_tensor(
         if (tensor_read_lazy == LLAMA_TENSOR_READ_LAZY_ON || ggml_nbytes(cur) > auto_lazy_min_size) {
             const auto & w = require_weight(tn.str().c_str());
             lazy_tensor_ranges[w.idx].emplace_back(w.offs, w.offs + ggml_nbytes(cur));
+
+            LLAMA_LOG_INFO("%s: tensor %s (size = %zu MiB) lazy read enabled\n",
+                    __func__, tn.str().c_str(), ggml_nbytes(cur)/1024/1024);
         }
     }
 
@@ -1373,7 +1376,7 @@ void llama_model_loader::init_mappings(bool prefetch, llama_mlocks * mlock_mmaps
             }
 
             const auto it_lazy = lazy_tensor_ranges.find(idx);
-            static const std::vector<std::pair<size_t, size_t>> no_lazy_ranges;
+            static const llama_mmap::ranges no_lazy_ranges;
 
             std::unique_ptr<llama_mmap> mapping = std::make_unique<llama_mmap>(file.get(), prefetch ? -1 : 0, is_numa,
                     it_lazy != lazy_tensor_ranges.end() ? it_lazy->second : no_lazy_ranges);
diff --git a/src/llama-model-loader.h b/src/llama-model-loader.h
index 9898d7f621..ec5b692463 100644
--- a/src/llama-model-loader.h
+++ b/src/llama-model-loader.h
@@ -93,7 +93,7 @@ struct llama_model_loader {
     llama_mmaps mappings;
 
     // byte ranges of TENSOR_READ_LAZY tensors, per file index
-    std::map<uint32_t, std::vector<std::pair<size_t, size_t>>> lazy_tensor_ranges;
+    std::map<uint32_t, llama_mmap::ranges> lazy_tensor_ranges;
 
     std::map<std::string, llama_tensor_weight, weight_name_comparer> weights_map;
     std::unordered_map<std::string, llama_model_kv_override> kv_overrides;