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#include <iostream>
#include <chrono>
#include <hardware/gralloc.h>
#include <vector>
#include <tuple>
#include <algorithm>
#include <tuple>
#include <numeric>
#include <fcntl.h>
#include <string>
#include <fstream>
#include <sys/wait.h>
using namespace std;
#define ASSERT_TRUE(cond) \
do { \
if (!(cond)) {\
cerr << __func__ << "( " << getpid() << "):" << __LINE__ << " condition:" << #cond << " failed\n" << endl; \
exit(EXIT_FAILURE); \
} \
} while (0)
class Pipe {
int m_readFd;
int m_writeFd;
Pipe(const Pipe &) = delete;
Pipe& operator=(const Pipe &) = delete;
Pipe& operator=(const Pipe &&) = delete;
public:
Pipe(int readFd, int writeFd) : m_readFd{readFd}, m_writeFd{writeFd} {
fcntl(m_readFd, F_SETFD, FD_CLOEXEC);
fcntl(m_writeFd, F_SETFD, FD_CLOEXEC);
}
Pipe(Pipe&& rval) noexcept {
m_readFd = rval.m_readFd;
m_writeFd = rval.m_writeFd;
rval.m_readFd = 0;
rval.m_writeFd = 0;
}
~Pipe() {
if (m_readFd)
close(m_readFd);
if (m_writeFd)
close(m_writeFd);
}
void preserveOverFork(bool preserve) {
if (preserve) {
fcntl(m_readFd, F_SETFD, 0);
fcntl(m_writeFd, F_SETFD,0);
} else {
fcntl(m_readFd, F_SETFD, FD_CLOEXEC);
fcntl(m_writeFd, F_SETFD, FD_CLOEXEC);
}
}
int getReadFd() {
return m_readFd;
}
int getWriteFd() {
return m_writeFd;
}
void signal() {
bool val = true;
int error = write(m_writeFd, &val, sizeof(val));
ASSERT_TRUE(error == sizeof(val));
};
void wait() {
bool val = false;
int error = read(m_readFd, &val, sizeof(val));
ASSERT_TRUE(error == sizeof(val));
}
bool wait_ret_error() {
bool val = false;
int error = read(m_readFd, &val, sizeof(val));
return (error != 1);
}
template <typename T> void send(const T& v) {
int error = write(m_writeFd, &v, sizeof(T));
ASSERT_TRUE(error >= 0);
}
template <typename T> void recv(T& v) {
int error = read(m_readFd, &v, sizeof(T));
ASSERT_TRUE(error >= 0);
}
static Pipe makePipeFromFds(int readFd, int writeFd) {
return Pipe(readFd, writeFd);
}
static tuple<Pipe, Pipe> createPipePair() {
int a[2];
int b[2];
int error1 = pipe(a);
int error2 = pipe(b);
ASSERT_TRUE(error1 >= 0);
ASSERT_TRUE(error2 >= 0);
return make_tuple(Pipe(a[0], b[1]), Pipe(b[0], a[1]));
}
};
void createProcess(Pipe pipe, const char *exName, const char *arg)
{
pipe.preserveOverFork(true);
pid_t pid = fork();
// child proc
if (pid == 0) {
char readFdStr[16];
char writeFdStr[16];
snprintf(readFdStr, sizeof(readFdStr), "%d", pipe.getReadFd());
snprintf(writeFdStr, sizeof(writeFdStr), "%d", pipe.getWriteFd());
execl(exName, exName, "--worker", arg, readFdStr, writeFdStr, nullptr);
ASSERT_TRUE(0);
}
// parent process
else if (pid > 0) {
pipe.preserveOverFork(false);
return;
}
else {
ASSERT_TRUE(0);
}
}
void writeToFile(const char * path, const char *data)
{
ofstream file(path);
file << data;
file.close();
}
size_t s = 4 * (1 << 20);
void *gptr;
int main(int argc, char *argv[])
{
if ((argc > 1) && (std::string(argv[1]) == "--worker")) {
Pipe p{atoi(argv[3]), atoi(argv[4])};
writeToFile("/proc/self/oom_adj", argv[2]);
long long allocCount = 0;
while (1) {
p.wait();
char *ptr = (char*)malloc(s);
memset(ptr, (int)allocCount >> 10, s);
for (int i = 0; i < s; i+= 4096) {
*((long long*)&ptr[i]) = allocCount + i;
}
usleep(10 * 1000);
gptr = ptr;
//cout << "total alloc: " << allocCount / (1<<20)<< " adj: " << argv[2]<< endl;;
//cout << "ptr: " << (long long)(void*)ptr << endl;;
p.signal();
allocCount += s;
}
} else {
writeToFile("/proc/self/oom_adj", "-17");
cout << "parent:" << argc << endl;
for (int i = 10; i >= 0; i--) {
auto pipes = Pipe::createPipePair();
char arg[16];
snprintf(arg, sizeof(arg), "%d", i);
createProcess(std::move(std::get<1>(pipes)), argv[0], arg);
Pipe &p = std::get<0>(pipes);
size_t t = 0;
while (1) {
//;cout << getpid() << ":" << "parent signal" << endl;
p.signal();
if (p.wait_ret_error()) {
int status;
waitpid(0, &status, 0);
break;
}
t += s;
}
cout << "adj: " << i << " sz: " << t / (1 << 20) << endl;
}
}
return 0;
}
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