From e3051df78c089fb1a1f621191048d22aa4606005 Mon Sep 17 00:00:00 2001
From: xirvik <community@xirvik.net>
Date: Wed, 23 Sep 2026 15:04:58 +0000
Subject: [PATCH] Give SessionManager::m_active its own cache line

Prevents false sharing with the adjacent m_mutex under concurrent access.
---
 src/session/session_manager.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/session/session_manager.h b/src/session/session_manager.h
index a3e1f9c1..43ed120c 100644
--- a/src/session/session_manager.h
+++ b/src/session/session_manager.h
@@ -100,9 +100,8 @@ private:
   bool                         m_use_fsyncdisk{true};
   bool                         m_use_lock{true};
 
-  align_cacheline std::mutex   m_mutex;
-
-  std::atomic<bool>            m_active{};
+  align_cacheline std::mutex        m_mutex;
+  align_cacheline std::atomic<bool> m_active{};
 
   std::deque<SaveRequest>      m_save_requests;
   std::atomic<size_t>          m_save_request_counter{};