chore(*): fix warnings on non-linux platforms (#7397)

Fix the warnings introduced by #7305

Approved-By: st1page
Approved-By: yuhao-su
Approved-By: BugenZhao
Approved-By: BowenXiao1999
Approved-By: ice1000

Author: TennyZhuang

src/compute/src/lib.rs

@@ -18,7 +18,7 @@
 #![feature(type_alias_impl_trait)]
 #![feature(let_chains)]
 #![feature(result_option_inspect)]
-#![feature(allocator_api)]
+#![feature(lint_reasons)]
 #![cfg_attr(coverage, feature(no_coverage))]
 
 #[macro_use]

src/compute/src/memory_management/memory_manager.rs

@@ -12,20 +12,24 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::sync::atomic::{AtomicU64, Ordering};
+use std::sync::atomic::AtomicU64;
 use std::sync::Arc;
+#[cfg(target_os = "linux")]
 use std::time::Duration;
 
 use risingwave_batch::task::BatchManager;
+#[cfg(target_os = "linux")]
 use risingwave_common::util::epoch::Epoch;
 use risingwave_stream::executor::monitor::StreamingMetrics;
 use risingwave_stream::task::LocalStreamManager;
 #[cfg(target_os = "linux")]
 use tikv_jemalloc_ctl::{epoch as jemalloc_epoch, stats as jemalloc_stats};
+#[cfg(target_os = "linux")]
 use tracing;
 
 /// When `enable_managed_cache` is set, compute node will launch a [`GlobalMemoryManager`] to limit
 /// the memory usage.
+#[cfg_attr(not(target_os = "linux"), expect(dead_code))]
 pub struct GlobalMemoryManager {
     /// All cached data before the watermark should be evicted.
     watermark_epoch: Arc<AtomicU64>,
@@ -39,7 +43,9 @@ pub struct GlobalMemoryManager {
 pub type GlobalMemoryManagerRef = Arc<GlobalMemoryManager>;
 
 impl GlobalMemoryManager {
+    #[cfg(target_os = "linux")]
     const EVICTION_THRESHOLD_AGGRESSIVE: f64 = 0.9;
+    #[cfg(target_os = "linux")]
     const EVICTION_THRESHOLD_GRACEFUL: f64 = 0.7;
 
     pub fn new(
@@ -63,7 +69,10 @@ impl GlobalMemoryManager {
         self.watermark_epoch.clone()
     }
 
+    #[cfg(target_os = "linux")]
     fn set_watermark_time_ms(&self, time_ms: u64) {
+        use std::sync::atomic::Ordering;
+
         let epoch = Epoch::from_physical_time(time_ms).0;
         let watermark_epoch = self.watermark_epoch.as_ref();
         watermark_epoch.store(epoch, Ordering::Relaxed);