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vm_native: detect overcommit support on FreeBSD and other OS

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Used in sparse memory initialization code.
This commit is contained in:
Nekotekina 2021-08-25 17:47:28 +03:00
parent b5dcfb3431
commit 63104af8e9
1 changed files with 41 additions and 1 deletions
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42
rpcs3/util/vm_native.cpp
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@ -13,6 +13,7 @@
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#ifdef __linux__
@ -437,7 +438,6 @@ namespace utils
m_handle = ensure(::CreateFileMappingW(f.get_handle(), nullptr, PAGE_READWRITE, 0, 0, nullptr));
#else
// TODO: check overcommit configuration of other supported platforms to bypass rpcs3_vm creation
#ifdef __linux__
if (const char c = fs::file("/proc/sys/vm/overcommit_memory").read<char>(); c == '0' || c == '1')
{
@ -451,6 +451,46 @@ namespace utils
{
fprintf(stderr, "Reading /proc/sys/vm/overcommit_memory: %c", c);
}
#else
int vm_overcommit = 0;
auto vm_sz = sizeof(int);
#if defined(__NetBSD__) || defined(__APPLE__)
// Always ON
vm_overcommit = 0;
#elif defined(__FreeBSD__) && defined(VM_OVERCOMMIT)
int mib[2]{CTL_VM, VM_OVERCOMMIT};
if (::sysctl(mib, 2, &vm_overcommit, &vm_sz, NULL, 0) != 0)
vm_overcommit = -1;
#elif defined(__FreeBSD__) || defined(__DragonFly__)
if (::sysctlbyname("vm.overcommit", &vm_overcommit, &vm_sz, NULL, 0) != 0)
vm_overcommit = -1;
#else
vm_overcommit = -1;
#endif
if ((vm_overcommit & 3) == 0)
{
#ifdef SHM_ANON
ensure(::shm_open(SHM_ANON, O_RDWR, S_IWUSR | S_IRUSR) == 0);
#else
const std::string name = "/rpcs3-mem2-" + std::to_string(reinterpret_cast<u64>(this));
while ((m_file = ::shm_open(name.c_str(), O_RDWR | O_CREAT | O_EXCL, S_IWUSR | S_IRUSR)) == -1)
{
if (errno == EMFILE)
{
fmt::throw_exception("Too many open files. Raise the limit and try again.");
}
ensure(errno == EEXIST);
}
ensure(::shm_unlink(name.c_str()) >= 0);
#endif
ensure(::ftruncate(m_file, m_size) >= 0);
return;
}
#endif
if (!storage.empty())