From b1d54024e705fbbcda7eee9cbc0b793fae439385 Mon Sep 17 00:00:00 2001
From: Joonas Koivunen <joonas@neon.tech>
Date: Tue, 28 Mar 2023 14:14:14 +0300
Subject: [PATCH] doc: why tokio mutex instead of std mutex

---
 pageserver/src/disk_usage_eviction_task.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pageserver/src/disk_usage_eviction_task.rs b/pageserver/src/disk_usage_eviction_task.rs
index eef64ae51c..b15070635d 100644
--- a/pageserver/src/disk_usage_eviction_task.rs
+++ b/pageserver/src/disk_usage_eviction_task.rs
@@ -288,6 +288,7 @@ pub async fn disk_usage_eviction_task_iteration_impl<U: Usage>(
     usage_pre: U,
     cancel: &CancellationToken,
 ) -> anyhow::Result<IterationOutcome<U>> {
+    // use tokio's mutex to get a Sync guard (instead of std::sync::Mutex)
     let _g = state
         .mutex
         .try_lock()