Add tcmalloc soft limit memory handler

commit_hash:30c5264fd43f57937d3355fd8096e0a447ce19e1

1 files changed, 49 insertions, 0 deletions

diff --git a/contrib/libs/tcmalloc/patches/handler.patch b/contrib/libs/tcmalloc/patches/handler.patch
new file mode 100644
index 0000000000..ce30d7e1c2
--- /dev/null
+++ b/contrib/libs/tcmalloc/patches/handler.patch
@@ -0,0 +1,49 @@
+--- contrib/libs/tcmalloc/tcmalloc/malloc_extension.cc	(index)
++++ contrib/libs/tcmalloc/tcmalloc/malloc_extension.cc	(working tree)
+@@ -468,6 +468,20 @@ void MallocExtension::EnableForkSupport() {
+ #endif
+ }
+ 
++static std::atomic<MallocExtension::SoftMemoryLimitCallback*> SoftMemoryLimitHandler_;
++
++void MallocExtension::SetSoftMemoryLimitHandler(SoftMemoryLimitCallback* handler) {
++#if ABSL_INTERNAL_HAVE_WEAK_MALLOCEXTENSION_STUBS
++  SoftMemoryLimitHandler_.store(handler);
++#endif
++}
++
++MallocExtension::SoftMemoryLimitCallback* MallocExtension::GetSoftMemoryLimitHandler() {
++#if ABSL_INTERNAL_HAVE_WEAK_MALLOCEXTENSION_STUBS
++  return SoftMemoryLimitHandler_.load();
++#endif
++}
++
+ void MallocExtension::SetSampleUserDataCallbacks(
+     CreateSampleUserDataCallback create,
+     CopySampleUserDataCallback copy,
+--- contrib/libs/tcmalloc/tcmalloc/malloc_extension.h	(index)
++++ contrib/libs/tcmalloc/tcmalloc/malloc_extension.h	(working tree)
+@@ -475,6 +475,10 @@ class MallocExtension final {
+   // Allocator will continue to function correctly in the child, after calling fork().
+   static void EnableForkSupport();
+ 
++  using SoftMemoryLimitCallback = void();
++  static void SetSoftMemoryLimitHandler(SoftMemoryLimitCallback* handler);
++  static SoftMemoryLimitCallback* GetSoftMemoryLimitHandler();
++
+   using CreateSampleUserDataCallback = void*();
+   using CopySampleUserDataCallback = void*(void*);
+   using DestroySampleUserDataCallback = void(void*);
+--- contrib/libs/tcmalloc/tcmalloc/page_allocator.cc	(index)
++++ contrib/libs/tcmalloc/tcmalloc/page_allocator.cc	(working tree)
+@@ -151,6 +151,10 @@ void PageAllocator::ShrinkToUsageLimit() {
+   warned = true;
+   Log(kLogWithStack, __FILE__, __LINE__, "Couldn't respect usage limit of ",
+       limit_, "and OOM is likely to follow.");
++
++  if (auto* handler = MallocExtension::GetSoftMemoryLimitHandler()) {
++    (*handler)();
++  }
+ }
+ 
+ bool PageAllocator::ShrinkHardBy(Length pages) {