linux-kernel - [PATCH] printk: add sleep time into timestamp

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Message-ID: <1395908241-6392-1-git-send-email-zhangwm@marvell.com>
Date:	Thu, 27 Mar 2014 16:17:21 +0800
From:	Neil Zhang <zhangwm@...vell.com>
To:	<akpm@...ux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>, Neil Zhang <zhangwm@...vell.com>
Subject: [PATCH] printk: add sleep time into timestamp

Add sleep time into timestamp to reflect the actual time since
sched_clock will be stopped during suspend.

This patch depends on the following patch.
timekeeping: check params before use them

Signed-off-by: Neil Zhang <zhangwm@...vell.com>
---
 kernel/printk/printk.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 4dae9cb..2dc6145 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -250,6 +250,17 @@ static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
 static char *log_buf = __log_buf;
 static u32 log_buf_len = __LOG_BUF_LEN;
 
+static u64 print_clock(void)
+{
+	struct timespec	ts;
+	u64 ts_nsec = local_clock();
+
+	get_xtime_and_monotonic_and_sleep_offset(NULL, NULL, &ts);
+	ts_nsec += (u64)ts.tv_sec * NSEC_PER_SEC + (u64)ts.tv_nsec;
+
+	return ts_nsec;
+}
+
 /* cpu currently holding logbuf_lock */
 static volatile unsigned int logbuf_cpu = UINT_MAX;
 
@@ -349,7 +360,7 @@ static void log_store(int facility, int level,
 	if (ts_nsec > 0)
 		msg->ts_nsec = ts_nsec;
 	else
-		msg->ts_nsec = local_clock();
+		msg->ts_nsec = print_clock();
 	memset(log_dict(msg) + dict_len, 0, pad_len);
 	msg->len = sizeof(struct printk_log) + text_len + dict_len + pad_len;
 
@@ -1440,7 +1451,7 @@ static bool cont_add(int facility, int level, const char *text, size_t len)
 		cont.facility = facility;
 		cont.level = level;
 		cont.owner = current;
-		cont.ts_nsec = local_clock();
+		cont.ts_nsec = print_clock();
 		cont.flags = 0;
 		cont.cons = 0;
 		cont.flushed = false;
-- 
1.7.9.5

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