From 0ee9eb5599e9579623e581266fc8a0be62d65960 Mon Sep 17 00:00:00 2001
From: MaranBr <maranbr@outlook.com>
Date: Fri, 22 Aug 2025 13:29:01 -0400
Subject: [PATCH] Try to fix slow down in some games

---
 src/common/host_memory.cpp | 76 ++++++--------------------------------
 1 file changed, 12 insertions(+), 64 deletions(-)

diff --git a/src/common/host_memory.cpp b/src/common/host_memory.cpp
index 949cd188f3..e0b5a6a67c 100644
--- a/src/common/host_memory.cpp
+++ b/src/common/host_memory.cpp
@@ -1,6 +1,3 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -12,7 +9,7 @@
 #include <windows.h>
 #include "common/dynamic_library.h"
 
-#elif defined(__linux__) || defined(__FreeBSD__) || defined(__sun__) // ^^^ Windows ^^^ vvv Linux vvv
+#elif defined(__linux__) || defined(__FreeBSD__) // ^^^ Windows ^^^ vvv Linux vvv
 
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
@@ -24,14 +21,9 @@
 #include <unistd.h>
 #include "common/scope_exit.h"
 
-// FreeBSD
 #ifndef MAP_NORESERVE
 #define MAP_NORESERVE 0
 #endif
-// Solaris 11 and illumos
-#ifndef MAP_ALIGNED_SUPER
-#define MAP_ALIGNED_SUPER 0
-#endif
 
 #endif // ^^^ Linux ^^^
 
@@ -372,7 +364,7 @@ private:
     std::unordered_map<size_t, size_t> placeholder_host_pointers; ///< Placeholder backing offset
 };
 
-#elif defined(__linux__) || defined(__FreeBSD__) || defined(__sun__) // ^^^ Windows ^^^ vvv Linux vvv
+#elif defined(__linux__) || defined(__FreeBSD__) // ^^^ Windows ^^^ vvv Linux vvv
 
 #ifdef ARCHITECTURE_arm64
 
@@ -417,62 +409,22 @@ static void* ChooseVirtualBase(size_t virtual_size) {
 #else
 
 static void* ChooseVirtualBase(size_t virtual_size) {
-    void* virtual_base = mmap(nullptr, virtual_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_ALIGNED_SUPER, -1, 0);
-    if (virtual_base != MAP_FAILED)
+#if defined(__FreeBSD__)
+    void* virtual_base =
+        mmap(nullptr, virtual_size, PROT_READ | PROT_WRITE,
+             MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_ALIGNED_SUPER, -1, 0);
+
+    if (virtual_base != MAP_FAILED) {
         return virtual_base;
+    }
+#endif
+
     return mmap(nullptr, virtual_size, PROT_READ | PROT_WRITE,
                 MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
 }
 
 #endif
 
-#if defined(__sun__) || defined(__HAIKU__) || defined(__NetBSD__) || defined(__DragonFly__)
-/// Most Unices don't have a portable shm_open (AIX, OpenBSD, NetBSD, Solaris 11, OpenIndiana)
-/// Portable implementation of shm_open(SHM_ANON, ...) - roughly equivalent but without
-/// OS support - may fail sporadically, beware!
-static int shm_open_anon(int flags, mode_t mode) {
-    char name[16] = "/shm-";
-    char *const limit = name + sizeof(name) - 1;
-    *limit = '\0';
-    char *start = name + strlen(name);
-    for (int tries = 0; tries < 4; tries++) {
-        struct timespec tv;
-        clock_gettime(CLOCK_REALTIME, &tv);
-        unsigned long r = (unsigned long)tv.tv_sec + (unsigned long)tv.tv_nsec;
-        for (char *fill = start; fill < limit; r /= 8)
-            *fill++ = '0' + (r % 8);
-        int fd = shm_open(name, flags, mode);
-        if (fd != -1) {
-            if (shm_unlink(name) == -1) {
-                int tmp = errno;
-                close(fd);
-                errno = tmp;
-                return -1;
-            }
-            return fd;
-        }
-        if (errno != EEXIST)
-            break;
-    }
-    return -1;
-}
-#elif defined(__OpenBSD__)
-/// Except OpenBSD which explicitly uses shm_mkstemp instead (as a more secure alternative)
-static int shm_open_anon(int flags, mode_t mode) {
-    char name[16] = "/shm-XXXXXXXXXX";
-    int fd;
-    if ((fd = shm_mkstemp(name)) == -1)
-        return -1;
-    if (shm_unlink(name) == -1) {
-        int tmp = errno;
-        close(fd);
-        errno = tmp;
-        return -1;
-    }
-    return fd;
-}
-#endif
-
 class HostMemory::Impl {
 public:
     explicit Impl(size_t backing_size_, size_t virtual_size_)
@@ -491,11 +443,7 @@ public:
         }
 
         // Backing memory initialization
-#if defined(__sun__) || defined(__HAIKU__) || defined(__NetBSD__) || defined(__DragonFly__)
-        fd = shm_open_anon(O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW, 0600);
-#elif defined(__OpenBSD__)
-        fd = shm_open_anon(O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW, 0600);
-#elif defined(__FreeBSD__) && __FreeBSD__ < 13
+#if defined(__FreeBSD__) && __FreeBSD__ < 13
         // XXX Drop after FreeBSD 12.* reaches EOL on 2024-06-30
         fd = shm_open(SHM_ANON, O_RDWR, 0600);
 #else