From 97c11bcb94f90852fcebf7d23dc066dc2feec6a3 Mon Sep 17 00:00:00 2001
From: Evgeniy Kazarin <evgkaz0@gmail.com>
Date: Sun, 18 Oct 2026 06:03:30 +0300
Subject: [PATCH] perf(libc): release exact resident mappings without repeated
 queries

---
 core/libs/prx/libc/include/WindowsMappings.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/libs/prx/libc/include/WindowsMappings.hpp b/core/libs/prx/libc/include/WindowsMappings.hpp
index 56c8851fbe..4fbf8031ed 100644
--- a/core/libs/prx/libc/include/WindowsMappings.hpp
+++ b/core/libs/prx/libc/include/WindowsMappings.hpp
@@ -798,6 +798,11 @@ private:
         forgetClean(address, end);
         breakRun(address);
         breakRun(end);
+        if (const auto run = residentRuns.find(address); run != residentRuns.end() && run->second.end == end) {
+            evict(run);
+            if (!VirtualFree(reinterpret_cast<void*>(address), bytes, MEM_RELEASE | MEM_PRESERVE_PLACEHOLDER)) fail("release private guest memory");
+            return;
+        }
         for (auto cursor = address; cursor < end;) {
             const auto memory = query(cursor);
             if (memory.State == MEM_RESERVE) {