Proxy: Reduce proxy's size by compressing some debug sections (#8915)

close #7256

contrib/tiflash-proxy-cmake/tiflash_proxy_linux_post_install.cmake

@@ -0,0 +1,21 @@
+# Copyright 2024 PingCAP, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+find_program(OBJCOPY_EXECUTABLE "objcopy")
+if(OBJCOPY_EXECUTABLE)
+    message(STATUS "Compressing debug sections for ${CMAKE_INSTALL_PREFIX}/tiflash-proxy...")
+    execute_process(COMMAND ${OBJCOPY_EXECUTABLE} --compress-debug-sections=zlib-gnu ${CMAKE_INSTALL_PREFIX}/libtiflash_proxy.so)
+else()
+    message(WARNING "objcopy not found in PATH. Skipped debug section compression for proxy.")
+endif()

dbms/src/Server/CMakeLists.txt

@@ -129,6 +129,7 @@ if (OS_LINUX)
     if (NOT (CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG" OR SAN_DEBUG))
         install (SCRIPT ${TiFlash_SOURCE_DIR}/cmake/tiflash_linux_post_install.cmake COMPONENT tiflash-release)
     endif()
+    install (SCRIPT ${TiFlash_SOURCE_DIR}/contrib/tiflash-proxy-cmake/tiflash_proxy_linux_post_install.cmake COMPONENT tiflash-release)
 elseif(APPLE)
     # set build rpaths, so that executables can be directly called in build tree (easy to debug)
     set_target_properties(tiflash PROPERTIES BUILD_RPATH "@executable_path/;@executable_path/${TIFLASH_PROXY_LIB_RPATH}/")

dbms/src/Storages/KVStore/KVStore.cpp

@@ -589,7 +589,15 @@ void KVStore::reportThreadAllocBatch(std::string_view name, ReportThreadAllocate
         return;
     // TODO(jemalloc-trace) Could be costy.
     auto k = getThreadNameAggPrefix(name);
-    int64_t v = static_cast<int64_t>(data.alloc) - static_cast<int64_t>(data.dealloc);
+    int64_t v = 0;
+    if (data.alloc > data.dealloc)
+    {
+        v = data.alloc - data.dealloc;
+    }
+    else
+    {
+        v = -(data.dealloc - data.alloc);
+    }
     auto & tiflash_metrics = TiFlashMetrics::instance();
     tiflash_metrics.setProxyThreadMemory(k, v);
 }