add signale for recycle jemalloc cache

add signal handler for recycle jemalloc cache before application freeze

I7I5K6
Signed-off-by: Nlice <lice4@huawei.com>

musl_config.gni

@@ -36,6 +36,7 @@ declare_args() {
   user_custom_libc = true
   use_jemalloc = false
   use_jemalloc_dfx_intf = false
+  use_jemalloc_recycle_func = false
   use_pthread_cancel = false
   musl_ported_dir = "intermidiates/${musl_target_os}/musl_src_ported"
   musl_inc_out_dir = "usr/include/${musl_target_triple}"

musl_template.gni

@@ -584,6 +584,9 @@ template("musl_libs") {
       if (use_jemalloc_dfx_intf) {
         defines += [ "USE_JEMALLOC_DFX_INTF" ]
       }
+      if (use_jemalloc_recycle_func) {
+        defines += [ "USE_JEMALLOC_RECYCLE_FUNC" ]
+      }
       include_dirs = [ "//third_party/jemalloc/include/jemalloc" ]
     }
 
@@ -797,6 +800,9 @@ template("musl_libs") {
       if (use_jemalloc_dfx_intf) {
         defines += [ "USE_JEMALLOC_DFX_INTF" ]
       }
+      if (use_jemalloc_recycle_func) {
+        defines += [ "USE_JEMALLOC_RECYCLE_FUNC" ]
+      }
       include_dirs = [ "//third_party/jemalloc/include/jemalloc" ]
     }
 

porting/linux/user/include/signal.h

@@ -217,6 +217,9 @@ int __libc_current_sigrtmax(void);
 #define MUSL_SIGNAL_NATIVE_LOCAL (SIGRTMIN + 3)
 #define MUSL_SIGNAL_JSHEAP (SIGRTMIN + 4)
 #define MUSL_SIGNAL_JSHEAP_PRIV (SIGRTMIN + 5)
+#ifdef USE_JEMALLOC_RECYCLE_FUNC
+#define MUSL_SIGNAL_RECYCLE_JEMALLOC(SIGRTMIN + 8)
+#endif
 #define MUSL_SIGNAL_MEMCHECK (SIGRTMIN + 9)
 
 int kill(pid_t, int);

porting/linux/user/src/hook/musl_preinit.c

@@ -271,6 +271,28 @@ static bool init_prctl_function(void* malloc_shared_library_handler, MallocPrctl
 	return true;
 }
 
+#ifdef USE_JEMALLOC_RECYCLE_FUNC
+extern int je_reclaim_cache();
+static void handle_recycle_cache()
+{
+	int ret;
+	ret = je_reclaim_cache();
+	MUSL_LOGD("je_reclaim_cache result=%{public}d", ret);
+}
+
+static void init_jemalloc_recycle_handler()
+{
+	struct sigaction action = {};
+	action.sa_handler = NULL;
+	action.sa_sigaction = handle_recycle_cache;
+	sigemptyset(&action.sa_mask);
+	sigaddset(&action.sa_mask, MUSL_SIGNAL_RECYCLE_JEMALLOC);
+	action.sa_flags = SA_SIGINFO | SA_RESTART;
+	action.sa_restorer = NULL;
+	sigaction(MUSL_SIGNAL_RECYCLE_JEMALLOC, &action, NULL);
+
+}
+#endif
 
 static bool init_hook_functions(void* shared_library_handler, struct MallocDispatchType* table, const char* prefix)
 {
@@ -626,6 +648,9 @@ static void __install_malloc_hook_signal_handler()
 static void __initialize_malloc()
 {
 	__install_malloc_hook_signal_handler();
+#ifdef USE_JEMALLOC_RECYCLE_FUNC
+	init_jemalloc_recycle_handler();
+#endif
 }
 
 __attribute__((constructor(1))) static void __musl_initialize()