From: Matt Corallo <git@bluematt.me>
Date: Wed, 28 Jul 2021 14:29:02 +0000 (+0000)
Subject: Drop memory limit. It was useful to debug OOMs but is now unnecessary
X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=refs%2Fheads%2Fmaster;p=dnsseed-rust

Drop memory limit. It was useful to debug OOMs but is now unnecessary
---

diff --git a/src/main.rs b/src/main.rs
index 2dc2f8c..d887934 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -41,48 +41,6 @@ static mut TOR_PROXY: Option<SocketAddr> = None;
 pub static START_SHUTDOWN: AtomicBool = AtomicBool::new(false);
 static SCANNING: AtomicBool = AtomicBool::new(false);
 
-
-use std::alloc::{GlobalAlloc, Layout, System};
-use std::ptr;
-use std::sync::atomic::AtomicUsize;
-
-// We keep track of all memory allocated by Rust code, refusing new allocations if it exceeds
-// 1.75GB.
-//
-// Note that while Rust's std, in general, should panic in response to a null allocation, it
-// is totally conceivable that some code will instead dereference this null pointer, which
-// would violate our guarantees that Rust modules should never crash the entire application.
-//
-// In the future, as upstream Rust explores a safer allocation API (eg the Alloc API which
-// returns Results instead of raw pointers, or redefining the GlobalAlloc API to allow
-// panic!()s inside of alloc calls), we should switch to those, however these APIs are
-// currently unstable.
-const TOTAL_MEM_LIMIT_BYTES: usize = (1024 + 756) * 1024 * 1024;
-static TOTAL_MEM_ALLOCD: AtomicUsize = AtomicUsize::new(0);
-struct MemoryLimitingAllocator;
-unsafe impl GlobalAlloc for MemoryLimitingAllocator {
-	unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
-		let len = layout.size();
-		if len > TOTAL_MEM_LIMIT_BYTES {
-			return ptr::null_mut();
-		}
-		if TOTAL_MEM_ALLOCD.fetch_add(len, Ordering::AcqRel) + len > TOTAL_MEM_LIMIT_BYTES {
-			TOTAL_MEM_ALLOCD.fetch_sub(len, Ordering::AcqRel);
-			return ptr::null_mut();
-		}
-		System.alloc(layout)
-	}
-
-	unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
-		System.dealloc(ptr, layout);
-		TOTAL_MEM_ALLOCD.fetch_sub(layout.size(), Ordering::AcqRel);
-	}
-}
-
-#[global_allocator]
-static ALLOC: MemoryLimitingAllocator = MemoryLimitingAllocator;
-
-
 struct PeerState {
 	request: Arc<(u64, BlockHash, Block)>,
 	pong_nonce: u64,