rok commented on code in PR #13516:
URL: https://github.com/apache/arrow/pull/13516#discussion_r966342844


##########
cpp/src/arrow/memory_pool.h:
##########
@@ -180,6 +180,12 @@ Status jemalloc_set_decay_ms(int ms);
 /// May return NotImplemented if mimalloc is not available.
 ARROW_EXPORT Status mimalloc_memory_pool(MemoryPool** out);
 
+ARROW_EXPORT Status jemalloc_mallctl(const char* name, void* oldp, size_t* 
oldlenp,
+                                     void* newp, size_t newlen);
+
+ARROW_EXPORT Status jemalloc_stats_print(void (*write_cb)(void*, const char*),
+                                         void* cbopaque, const char* opts);

Review Comment:
   I made this only take `opts`.



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