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Drop redundant PROT_NONE tracking in reserve paths for Linux (#122)

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src: platform: Linux: Drop redundant PROT_NONE tracking in reserve paths

* Some UE4 games, such as The Pathless, reserve a 512 GiB virtual address range during libc startup.
  Tracking every 4 KiB page causes a long delay and is unnecessary since the range is already PROT_NONE,
  and untracked pages are treated as NoAccess.

Signed-off-by: Claxten <claxten10@gmail.com>
This commit is contained in:
Claxten
2026-07-30 00:00:21 +02:00
committed by GitHub
parent cc76827e63
commit e91dd39cb0
1 changed files with 0 additions and 10 deletions
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src/common/platform/sysLinuxVirtual.cpp
-10
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@@ -432,11 +432,6 @@ uint64_t SysVirtualReserveAligned(uint64_t address, uint64_t size, uint64_t alig
pthread_mutex_lock(&g_virtual_mutex); pthread_mutex_lock(&g_virtual_mutex);
record_alloc(ret_addr, size); record_alloc(ret_addr, size);
uintptr_t page_start = ret_addr >> 12u;
uintptr_t page_end = (ret_addr + size - 1) >> 12u;
for (uintptr_t page = page_start; page <= page_end; page++) {
(*g_protects)[page] = PROT_NONE;
}
pthread_mutex_unlock(&g_virtual_mutex); pthread_mutex_unlock(&g_virtual_mutex);
return ret_addr; return ret_addr;
@@ -470,11 +465,6 @@ bool SysVirtualReserveFixed(uint64_t address, uint64_t size) {
if (ptr != MAP_FAILED) { if (ptr != MAP_FAILED) {
pthread_mutex_lock(&g_virtual_mutex); pthread_mutex_lock(&g_virtual_mutex);
record_alloc(ret_addr, size); record_alloc(ret_addr, size);
uintptr_t page_start = ret_addr >> 12u;
uintptr_t page_end = (ret_addr + size - 1) >> 12u;
for (uintptr_t page = page_start; page <= page_end; page++) {
(*g_protects)[page] = PROT_NONE;
}
pthread_mutex_unlock(&g_virtual_mutex); pthread_mutex_unlock(&g_virtual_mutex);
return true; return true;