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#pragma once
#include <iostream>
#include <sys/mman.h>
#include <sys/resource.h>
#define DECL_MAIN int main()
#define NOINLINE __attribute__((noinline))
namespace pal {
static constexpr size_t kPageSize =
#if defined(__APPLE__) && defined(__aarch64__)
0x4000
#else
0x1000
#endif
;
inline void* MemReserve(size_t len) {
int flags = MAP_PRIVATE | MAP_ANONYMOUS;
#ifdef MAP_NORESERVE
// On Linux, guarantee lazy commit even if /proc/sys/vm/overcommit_memory is set to `heuristic` (0).
flags |= MAP_NORESERVE;
#endif
void* buf = mmap(nullptr, len, PROT_NONE, flags, -1, 0);
if (buf == nullptr) {
int saved_errno = errno;
std::cerr << "Reserving memory with mmap failed. Exit code: " << saved_errno << std::endl;
return nullptr;
}
return buf;
}
inline bool MemCommit(void* p, size_t len) {
if (mprotect(p, len, PROT_READ | PROT_WRITE) != 0) {
int saved_errno = errno;
std::cerr << "Committing memory with mprotect failed. Exit code: " << saved_errno << std::endl;
return false;
}
return true;
}
inline void MemFree(void* p, size_t len) {
if (munmap(p, len) != 0) {
int saved_errno = errno;
std::cerr << "Failed to unmap memory. Exit code: " << saved_errno << std::endl;
}
}
inline size_t GetPeakMemoryUse() {
rusage r_usage;
if (getrusage(RUSAGE_SELF, &r_usage) != 0) {
int saved_errno = errno;
std::cerr << "Failed to fetch memory use. Exit code: " << saved_errno << std::endl;
return 0;
}
// On Mac, ru_maxrss is in bytes. On Linux and FreeBSD it's in kilobytes. So much for POSIX.
#ifdef __APPLE__
size_t multiplier = 1;
#else
size_t multiplier = 1000;
#endif
return r_usage.ru_maxrss * multiplier;
}
inline uint64_t ConvertTimevalToMicroseconds(timeval t) {
return static_cast<uint64_t>(t.tv_sec) * 1000000ULL + static_cast<uint64_t>(t.tv_usec);
}
inline uint64_t GetCpuTime() {
rusage r_usage;
if (getrusage(RUSAGE_SELF, &r_usage) != 0) {
int saved_errno = errno;
std::cerr << "Failed to fetch memory use. Exit code: " << saved_errno << std::endl;
return 0;
}
auto user_time = ConvertTimevalToMicroseconds(r_usage.ru_utime);
auto kernel_time = ConvertTimevalToMicroseconds(r_usage.ru_stime);
return user_time + kernel_time;
}
} // namespace pal
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