linux-kernel - [PATCH V2] printk: add sleep time into timestamp

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Date:	Tue, 1 Apr 2014 11:20:56 +0800
From:	Neil Zhang <zhangwm@...vell.com>
To:	<akpm@...ux-foundation.org>
CC:	<john.stultz@...aro.org>, <linux-kernel@...r.kernel.org>,
	Neil Zhang <zhangwm@...vell.com>
Subject: [PATCH V2] printk: add sleep time into timestamp

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

Thanks John Stultz for suggestion to use monotonic_to_bootbased.

Signed-off-by: Neil Zhang <zhangwm@...vell.com>
---
 kernel/printk/printk.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 4dae9cb..121f792 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -250,6 +250,18 @@ 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();
+
+	ts = ns_to_timespec(ts_nsec);
+	monotonic_to_bootbased(&ts);
+	ts_nsec = timespec_to_ns(&ts);
+
+	return ts_nsec;
+}
+
 /* cpu currently holding logbuf_lock */
 static volatile unsigned int logbuf_cpu = UINT_MAX;
 
@@ -349,7 +361,7 @@ 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 +1452,7 @@ 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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