3 files changed, 19 insertions, 0 deletions
diff --git a/libnetdata/onewayalloc/README.md b/libnetdata/onewayalloc/README.md
index 1f459c263..3fa0d9fd3 100644
--- a/libnetdata/onewayalloc/README.md
+++ b/libnetdata/onewayalloc/README.md
@@ -1,6 +1,10 @@
 <!--
 title: "One Way Allocator"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/onewayallocator/README.md
+sidebar_label: "One way allocator"
+learn_status: "Published"
+learn_topic_type: "Tasks"
+learn_rel_path: "Developers/libnetdata libraries"
 -->
 
 # One Way Allocator
diff --git a/libnetdata/onewayalloc/onewayalloc.c b/libnetdata/onewayalloc/onewayalloc.c
index 59c3b6859..2f007b189 100644
--- a/libnetdata/onewayalloc/onewayalloc.c
+++ b/libnetdata/onewayalloc/onewayalloc.c
@@ -14,6 +14,12 @@ typedef struct owa_page {
     struct owa_page *last;     // the last page on the list - we currently allocate on this
 } OWA_PAGE;
 
+static size_t onewayalloc_total_memory = 0;
+
+size_t onewayalloc_allocated_memory(void) {
+    return __atomic_load_n(&onewayalloc_total_memory, __ATOMIC_RELAXED);
+}
+
 // allocations need to be aligned to CPU register width
 // https://en.wikipedia.org/wiki/Data_structure_alignment
 static inline size_t natural_alignment(size_t size) {
@@ -60,6 +66,7 @@ static OWA_PAGE *onewayalloc_create_internal(OWA_PAGE *head, size_t size_hint) {
     // OWA_PAGE *page = (OWA_PAGE *)netdata_mmap(NULL, size, MAP_ANONYMOUS|MAP_PRIVATE, 0);
     // if(unlikely(!page)) fatal("Cannot allocate onewayalloc buffer of size %zu", size);
     OWA_PAGE *page = (OWA_PAGE *)mallocz(size);
+    __atomic_add_fetch(&onewayalloc_total_memory, size, __ATOMIC_RELAXED);
 
     page->size = size;
     page->offset = natural_alignment(sizeof(OWA_PAGE));
@@ -183,11 +190,17 @@ void onewayalloc_destroy(ONEWAYALLOC *owa) {
     //     head->stats_mallocs_made, head->stats_mallocs_size,
     //     head->stats_pages, head->stats_pages_size);
 
+    size_t total_size = 0;
     OWA_PAGE *page = head;
     while(page) {
+        total_size += page->size;
+
         OWA_PAGE *p = page;
         page = page->next;
+
         // munmap(p, p->size);
         freez(p);
     }
+
+    __atomic_sub_fetch(&onewayalloc_total_memory, total_size, __ATOMIC_RELAXED);
 }
diff --git a/libnetdata/onewayalloc/onewayalloc.h b/libnetdata/onewayalloc/onewayalloc.h
index e536e0542..a415b063b 100644
--- a/libnetdata/onewayalloc/onewayalloc.h
+++ b/libnetdata/onewayalloc/onewayalloc.h
@@ -16,4 +16,6 @@ void onewayalloc_freez(ONEWAYALLOC *owa, const void *ptr);
 
 void *onewayalloc_doublesize(ONEWAYALLOC *owa, const void *src, size_t oldsize);
 
+size_t onewayalloc_allocated_memory(void);
+
 #endif // ONEWAYALLOC_H