Companion for paritytech/substrate#12795 (#6374)

* Begin removing `parity-util-mem`; remove `collect_memory_stats`

* Update some dependencies that were using `parity-util-mem`

* Remove `trie-memory-tracker` feature

* Update Cargo.lock

* Update `kvdb-shared-tests`

* Add back jemalloc

* Add missing license header

* update lockfile for {"substrate"}

Co-authored-by: parity-processbot <>
Co-authored-by: Andronik <write@reusable.software>

polkadot/src/main.rs

@@ -20,6 +20,11 @@
 
 use color_eyre::eyre;
 
+/// Global allocator. Changing it to another allocator will require changing
+/// `memory_stats::MemoryAllocationTracker`.
+#[global_allocator]
+pub static ALLOC: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
+
 fn main() -> eyre::Result<()> {
  color_eyre::install()?;
  polkadot_cli::run()?;