From 0e48a0dd129e3cb1592eda9b2b8cdcde48d29bcf Mon Sep 17 00:00:00 2001
From: shenchenkai <shenchenkai@huawei.com>
Date: Fri, 17 Dec 2021 15:45:15 +0800
Subject: [PATCH] Description:[feature] support customized hilog ring buffer
 size

Change-Id: I5d23deaada5939bbb6fb57505f72c2348bd6afe9
Signed-off-by: shenchenkai <shenchenkai@huawei.com>
---
 kernel/extended/Kconfig           |  5 ++++-
 kernel/extended/hilog/Kconfig     | 15 +++++++++++++++
 kernel/extended/hilog/los_hilog.c |  7 ++++++-
 3 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 kernel/extended/hilog/Kconfig

diff --git a/kernel/extended/Kconfig b/kernel/extended/Kconfig
index 0ae789b6..abb7bec3 100644
--- a/kernel/extended/Kconfig
+++ b/kernel/extended/Kconfig
@@ -101,4 +101,7 @@ source "kernel/extended/hidumper/Kconfig"
 source "kernel/extended/perf/Kconfig"
 
 ######################### config options of lms #########################
-source "kernel/extended/lms/Kconfig"
\ No newline at end of file
+source "kernel/extended/lms/Kconfig"
+
+######################### config options of hilog #########################
+source "kernel/extended/hilog/Kconfig"
\ No newline at end of file
diff --git a/kernel/extended/hilog/Kconfig b/kernel/extended/hilog/Kconfig
new file mode 100644
index 00000000..28e99493
--- /dev/null
+++ b/kernel/extended/hilog/Kconfig
@@ -0,0 +1,15 @@
+config HILOG
+    tristate "Hilog support"
+    default y
+    help
+      hilog buffer manager.
+
+      Hilog is a simple log manager for OpenHarmonyOS.
+      log string write to /dev/hilog, and the hilog driver copy it
+      to the ring buffer. Ring buffer can be read from userspace.
+
+config HILOG_BUFFER_SIZE
+    int "hilog buffer size"
+    default 4096
+    help
+      Define the default ring buffer size of hilog
\ No newline at end of file
diff --git a/kernel/extended/hilog/los_hilog.c b/kernel/extended/hilog/los_hilog.c
index 2c8853be..9fe43ec6 100644
--- a/kernel/extended/hilog/los_hilog.c
+++ b/kernel/extended/hilog/los_hilog.c
@@ -41,7 +41,7 @@
 #include "los_vm_lock.h"
 #include "user_copy.h"
 
-#define HILOG_BUFFER 4096
+#define HILOG_BUFFER LOSCFG_HILOG_BUFFER_SIZE
 #define DRIVER_MODE 0666
 #define HILOG_DRIVER "/dev/hilog"
 
@@ -255,6 +255,7 @@ static void HiLogCoverOldLog(size_t bufLen)
     int retval;
     struct HiLogEntry header;
     size_t totalSize = bufLen + sizeof(struct HiLogEntry);
+    int dropLogLines = 0;
 
     while (totalSize + g_hiLogDev.size > HILOG_BUFFER) {
         retval = HiLogReadRingBuffer((unsigned char *)&header, sizeof(header));
@@ -262,9 +263,13 @@ static void HiLogCoverOldLog(size_t bufLen)
             break;
         }
 
+        dropLogLines++;
         HiLogBufferDec(sizeof(header));
         HiLogBufferDec(header.len);
     }
+    if (dropLogLines > 0) {
+        dprintf("hilog ringbuffer full, drop %d line(s) log", dropLogLines);
+    }
 }
 
 int HiLogWriteInternal(const char *buffer, size_t bufLen)