src: add --heapsnapshot-near-heap-limit option

This patch adds a --heapsnapshot-near-heap-limit CLI option
that takes heap snapshots when the V8 heap is approaching
the heap size limit. It will try to write the snapshots
to disk before the program crashes due to OOM.

PR-URL: https://github.com/nodejs/node/pull/33010
Refs: https://github.com/nodejs/node/issues/27552
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

1 files changed, 2 insertions, 18 deletions

diff --git a/src/inspector_profiler.cc b/src/inspector_profiler.cc
index 03cf2f6e5ca..9dd3e623ec8 100644
--- a/src/inspector_profiler.cc
+++ b/src/inspector_profiler.cc
@@ -394,22 +394,6 @@ static void EndStartedProfilers(Environment* env) {
   }
 }
 
-std::string GetCwd(Environment* env) {
-  char cwd[PATH_MAX_BYTES];
-  size_t size = PATH_MAX_BYTES;
-  const int err = uv_cwd(cwd, &size);
-
-  if (err == 0) {
-    CHECK_GT(size, 0);
-    return cwd;
-  }
-
-  // This can fail if the cwd is deleted. In that case, fall back to
-  // exec_path.
-  const std::string& exec_path = env->exec_path();
-  return exec_path.substr(0, exec_path.find_last_of(kPathSeparator));
-}
-
 void StartProfilers(Environment* env) {
   AtExit(env, [](void* env) {
     EndStartedProfilers(static_cast<Environment*>(env));
@@ -427,7 +411,7 @@ void StartProfilers(Environment* env) {
   if (env->options()->cpu_prof) {
     const std::string& dir = env->options()->cpu_prof_dir;
     env->set_cpu_prof_interval(env->options()->cpu_prof_interval);
-    env->set_cpu_prof_dir(dir.empty() ? GetCwd(env) : dir);
+    env->set_cpu_prof_dir(dir.empty() ? env->GetCwd() : dir);
     if (env->options()->cpu_prof_name.empty()) {
       DiagnosticFilename filename(env, "CPU", "cpuprofile");
       env->set_cpu_prof_name(*filename);
@@ -442,7 +426,7 @@ void StartProfilers(Environment* env) {
   if (env->options()->heap_prof) {
     const std::string& dir = env->options()->heap_prof_dir;
     env->set_heap_prof_interval(env->options()->heap_prof_interval);
-    env->set_heap_prof_dir(dir.empty() ? GetCwd(env) : dir);
+    env->set_heap_prof_dir(dir.empty() ? env->GetCwd() : dir);
     if (env->options()->heap_prof_name.empty()) {
       DiagnosticFilename filename(env, "Heap", "heapprofile");
       env->set_heap_prof_name(*filename);