[platform] Adjust scheduling params on some kernels

R=jarin@chromium.org

Change-Id: I47b506599ae338e8323ef0def63db3b2004ac798
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1594562Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61242}

src/base/platform/platform-aix.cc

@@ -127,5 +127,7 @@ std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
 
 void OS::SignalCodeMovingGC() {}
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-cygwin.cc

@@ -268,5 +268,7 @@ void OS::SignalCodeMovingGC() {
   // Nothing to do on Cygwin.
 }
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-freebsd.cc

@@ -86,5 +86,7 @@ std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
 
 void OS::SignalCodeMovingGC() {}
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-fuchsia.cc

@@ -163,5 +163,7 @@ int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) {
   return 0;
 }
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-linux.cc

@@ -172,5 +172,7 @@ void OS::SignalCodeMovingGC() {
   fclose(f);
 }
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-macos.cc

@@ -73,5 +73,25 @@ TimezoneCache* OS::CreateTimezoneCache() {
   return new PosixDefaultTimezoneCache();
 }
 
+void OS::AdjustSchedulingParams() {
+#if V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_IA32
+  {
+    // Check availability of scheduling params.
+    uint32_t val = 0;
+    size_t valSize = sizeof(val);
+    int rc = sysctlbyname("kern.tcsm_available", &val, &valSize, NULL, 0);
+    if (rc < 0 || !val) return;
+  }
+
+  {
+    // Adjust scheduling params.
+    uint32_t val = 1;
+    int rc = sysctlbyname("kern.tcsm_enable", NULL, NULL, &val, sizeof(val));
+    DCHECK_GE(rc, 0);
+    USE(rc);
+  }
+#endif
+}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-openbsd.cc

@@ -120,5 +120,7 @@ void OS::SignalCodeMovingGC() {
   fclose(f);
 }
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-qnx.cc

@@ -146,5 +146,7 @@ std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
 
 void OS::SignalCodeMovingGC() {}
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-solaris.cc

@@ -63,5 +63,7 @@ std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
 
 void OS::SignalCodeMovingGC() {}
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform-win32.cc

@@ -1392,5 +1392,7 @@ void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   DCHECK(result);
 }
 
+void OS::AdjustSchedulingParams() {}
+
 }  // namespace base
 }  // namespace v8

src/base/platform/platform.h

@@ -248,6 +248,8 @@ class V8_BASE_EXPORT OS {
 
   static int GetCurrentThreadId();
 
+  static void AdjustSchedulingParams();
+
   static void ExitProcess(int exit_code);
 
  private:

src/isolate.cc

@@ -319,6 +319,7 @@ Isolate::PerIsolateThreadData*
     base::MutexGuard lock_guard(&thread_data_table_mutex_);
     per_thread = thread_data_table_.Lookup(thread_id);
     if (per_thread == nullptr) {
+      base::OS::AdjustSchedulingParams();
       per_thread = new PerIsolateThreadData(this, thread_id);
       thread_data_table_.Insert(per_thread);
     }