Gather memory usage statistics through parity-util-mem (#3893)

* Gather memory usage statistics through `parity-util-mem`

* Update `Cargo.lock`

polkadot/node/metrics/src/lib.rs

@@ -26,13 +26,6 @@
 
 pub use metered_channel as metered;
 
-/// Memory allocation stats tracking.
-#[cfg(feature = "memory-stats")]
-pub mod memory_stats;
-
-#[cfg(feature = "memory-stats")]
-pub use self::memory_stats::{MemoryAllocationSnapshot, MemoryAllocationTracker};
-
 /// Cyclic metric collection support.
 pub mod metronome;
 pub use self::metronome::Metronome;

polkadot/node/metrics/src/memory_stats.rs

@@ -1,66 +0,0 @@
-// Copyright 2021 Parity Technologies (UK) Ltd.
-// This file is part of Polkadot.
-
-// Polkadot is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// Polkadot is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
-
-//! Memory tracking statistics.
-//!
-//! Many subsystems have common interests such as canceling a bunch of spawned jobs,
-//! or determining what their validator ID is. These common interests are factored into
-//! this module.
-//!
-//! This crate also reexports Prometheus metric types which are expected to be implemented by subsystems.
-
-// #[cfg(not(feature = "memory-stats"))]
-// use std::convert::Infallible;
-
-use jemalloc_ctl::{epoch, stats, Result};
-
-/// Accessor to the allocator internals.
-#[derive(Clone)]
-pub struct MemoryAllocationTracker {
-	epoch: jemalloc_ctl::epoch_mib,
-	allocated: stats::allocated_mib,
-	resident: stats::resident_mib,
-}
-
-impl MemoryAllocationTracker {
-	/// Create an instance of an allocation tracker.
-	pub fn new() -> Result<Self> {
-		Ok(Self {
-			epoch: epoch::mib()?,
-			allocated: stats::allocated::mib()?,
-			resident: stats::resident::mib()?,
-		})
-	}
-
-	/// Create an allocation snapshot.
-	pub fn snapshot(&self) -> Result<MemoryAllocationSnapshot> {
-		// update stats by advancing the allocation epoch
-		self.epoch.advance()?;
-
-		let allocated: u64 = self.allocated.read()? as _;
-		let resident: u64 = self.resident.read()? as _;
-		Ok(MemoryAllocationSnapshot { allocated, resident })
-	}
-}
-
-/// Snapshot of collected memory metrics.
-#[derive(Debug, Clone)]
-pub struct MemoryAllocationSnapshot {
-	/// Total resident memory, in bytes.
-	pub resident: u64,
-	/// Total allocated memory, in bytes.
-	pub allocated: u64,
-}