android 10 system/core無法打印log問題

1.關閉重定向
system/core/init/util.cpp
--- a/init/util.cpp
+++ b/init/util.cpp
@@ -454,7 +454,7 @@ static void InitAborter(const char* abort_message) {
 // SetStdioToDevNull() must be called again in second stage init.
 void SetStdioToDevNull(char** argv) {
     // Make stdin/stdout/stderr all point to /dev/null.
-    int fd = open("/dev/null", O_RDWR);
+/*    int fd = open("/dev/null", O_RDWR);
     if (fd == -1) {
         int saved_errno = errno;
         android::base::InitLogging(argv, &android::base::KernelLogger, InitAborter);
@@ -464,7 +464,7 @@ void SetStdioToDevNull(char** argv) {
     dup2(fd, STDIN_FILENO);
     dup2(fd, STDOUT_FILENO);
     dup2(fd, STDERR_FILENO);
-    if (fd > STDERR_FILENO) close(fd);
+    if (fd > STDERR_FILENO) close(fd);*/
 }

2. 修改打印速率

kernel/msm-4.9/include/linux/ratelimit.h

diff --git a/include/linux/ratelimit.h b/include/linux/ratelimit.h
index 57c9e06..499156a 100644
--- a/include/linux/ratelimit.h
+++ b/include/linux/ratelimit.h
@@ -6,7 +6,7 @@
 #include <linux/spinlock.h>
 
 #define DEFAULT_RATELIMIT_INTERVAL     (5 * HZ)
-#define DEFAULT_RATELIMIT_BURST                10
+#define DEFAULT_RATELIMIT_BURST                1000