use jemalloc under linux gnu/musl

stolen from linkerd/linkerd2@aaa6091
and advice from clux/muslrust#142

Signed-off-by: clux <[email protected]>

Author: clux

Cargo.lock

@@ -45,6 +45,9 @@ thiserror = "2.0.11"
 anyhow = "1.0.95"
 prometheus-client = "0.23.1"
 
+[target.'cfg(target_os = "linux")'.dependencies]
+jemallocator = "0.5"
+
 [dev-dependencies]
 assert-json-diff = "2.0.2"
 http = "1"

Cargo.toml

@@ -1,7 +1,10 @@
-#![allow(unused_imports, unused_variables)]
 use actix_web::{get, middleware, web::Data, App, HttpRequest, HttpResponse, HttpServer, Responder};
 pub use controller::{self, telemetry, State};
 
+#[cfg(all(target_os = "linux", target_arch = "x86_64"))]
+#[global_allocator]
+static GLOBAL: jemallocator::Jemalloc = jemallocator::Jemalloc;
+
 #[get("/metrics")]
 async fn metrics(c: Data<State>, _req: HttpRequest) -> impl Responder {
     let metrics = c.metrics();