linux-kernel - [PATCH 4/4] printk: add task name and CPU to console messages

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Message-Id: <20171204135314.9122-5-sergey.senozhatsky@gmail.com>
Date:   Mon,  4 Dec 2017 22:53:14 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>
Cc:     Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [PATCH 4/4] printk: add task name and CPU to console messages

*** FOR TESTING ***

Add current->comm/smp_processor_id() prefix to every console line.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 kernel/printk/printk.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index a34a839e6045..a36cc6b9148e 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1540,6 +1540,9 @@ static size_t print_prefix(const struct printk_log *msg, bool syslog, char *buf)
 		}
 	}
 
+	if (buf)
+		len += sprintf(buf, "{%s/%d}", current->comm,
+				smp_processor_id());
 	len += print_time(msg->ts_nsec, buf ? buf + len : NULL);
 	return len;
 }
-- 
2.15.1