memtx: implement unified interface for getting allocator statistics

Since tarantool can use different allocators, we need a single
interface for getting statistics that is suitable for all allocators.
Follow-up #5419

src/box/allocator.cc

@@ -34,7 +34,7 @@ struct small_alloc SmallAlloc::small_alloc;
 struct sys_alloc SysAlloc::sys_alloc;
 
 int
-small_stats_noop_cb(const struct mempool_stats *stats, void *cb_ctx)
+stats_noop_cb(const void *stats, void *cb_ctx)
 {
 	(void) stats;
 	(void) cb_ctx;
@@ -42,14 +42,14 @@ small_stats_noop_cb(const struct mempool_stats *stats, void *cb_ctx)
 }
 
 void
-allocators_stats(struct allocator_stats *stats, mempool_stats_cb cb,
+allocators_stats(struct allocator_stats *stats, allocator_stats_cb cb,
 		 void *cb_ctx) {
 	foreach_allocator<allocator_stat,
-		struct allocator_stats *&, mempool_stats_cb&, void *&>
+		struct allocator_stats *&, allocator_stats_cb&, void *&>
 			(stats, cb, cb_ctx);
 }
 
 void
 allocators_stats(struct allocator_stats *stats) {
-	allocators_stats(stats, small_stats_noop_cb, nullptr);
+	allocators_stats(stats, stats_noop_cb, nullptr);
 }

src/box/allocator.h

@@ -34,6 +34,8 @@
 #include <small/small.h>
 #include "sysalloc.h"
 
+typedef int (*allocator_stats_cb)(const void *, void *);
+
 struct alloc_stat {
 	size_t used;
 	size_t total;
@@ -45,7 +47,7 @@ struct allocator_stats {
 };
 
 int
-small_stats_noop_cb(const struct mempool_stats *stats, void *cb_ctx);
+stats_noop_cb(const void *stats, void *cb_ctx);
 
 struct allocator_settings {
 	struct small_allocator {
@@ -113,7 +115,7 @@ class SmallAlloc
 		return smfree(&small_alloc, ptr, size);
 	}
 	static inline void
-	stats(struct allocator_stats *alloc_stats, mempool_stats_cb cb,
+	stats(struct allocator_stats *alloc_stats, allocator_stats_cb cb,
 	      void *cb_ctx)
 	{
 		struct small_stats data_stats;
@@ -155,7 +157,7 @@ class SysAlloc
 		return sysfree(&sys_alloc, ptr, size);
 	}
 	static inline void
-	stats(struct allocator_stats *alloc_stats, mempool_stats_cb cb,
+	stats(struct allocator_stats *alloc_stats, allocator_stats_cb cb,
 	      void *cb_ctx)
 	{
 		(void) cb;
@@ -222,8 +224,8 @@ struct allocator_stat {
 };
 
 void
-allocators_stats(struct allocator_stats *stats, mempool_stats_cb cb,
+allocators_stats(struct allocator_stats *stats, allocator_stats_cb cb,
 		 void *cb_ctx);
 
 void
-allocators_stats(struct allocator_stats *stats);
+allocators_stats(struct allocator_stats *stats);
\ No newline at end of file

src/box/lua/slab.cc

@@ -47,10 +47,12 @@
 #include "box/allocator.h"
 
 static int
-small_stats_lua_cb(const struct mempool_stats *stats, void *cb_ctx)
+small_stats_lua_cb(const void *stats, void *cb_ctx)
 {
+	const struct mempool_stats *mempool_stats =
+		(const struct mempool_stats *)stats;
 	/** Don't publish information about empty slabs. */
-	if (stats->slabcount == 0)
+	if (mempool_stats->slabcount == 0)
 		return 0;
 
 	struct lua_State *L = (struct lua_State *) cb_ctx;
@@ -69,27 +71,28 @@ small_stats_lua_cb(const struct mempool_stats *stats, void *cb_ctx)
 	luaL_setmaphint(L, -1);
 
 	lua_pushstring(L, "mem_used");
-	luaL_pushuint64(L, stats->totals.used);
+	luaL_pushuint64(L, mempool_stats->totals.used);
 	lua_settable(L, -3);
 
 	lua_pushstring(L, "slab_size");
-	luaL_pushuint64(L, stats->slabsize);
+	luaL_pushuint64(L, mempool_stats->slabsize);
 	lua_settable(L, -3);
 
 	lua_pushstring(L, "mem_free");
-	luaL_pushuint64(L, stats->totals.total - stats->totals.used);
+	luaL_pushuint64(L, mempool_stats->totals.total -
+			mempool_stats->totals.used);
 	lua_settable(L, -3);
 
 	lua_pushstring(L, "item_size");
-	luaL_pushuint64(L, stats->objsize);
+	luaL_pushuint64(L, mempool_stats->objsize);
 	lua_settable(L, -3);
 
 	lua_pushstring(L, "slab_count");
-	luaL_pushuint64(L, stats->slabcount);
+	luaL_pushuint64(L, mempool_stats->slabcount);
 	lua_settable(L, -3);
 
 	lua_pushstring(L, "item_count");
-	luaL_pushuint64(L, stats->objcount);
+	luaL_pushuint64(L, mempool_stats->objcount);
 	lua_settable(L, -3);
 
 	lua_settable(L, -3);

small @ 3d15a705

-Subproject commit 8c3a4be19932458a16618eb86c906928c984b271
+Subproject commit 3d15a705817ff60ef6fe5e4b70ae4c09056927e3