[PATCH] printk: Print cpuid along with the timestamp withCONFIG_PRINTK_TIME
From: Ravikiran G Thirumalai
Date: Thu Sep 18 2008 - 15:37:33 EST
I found it useful to have the cpuid of the printing cpu along with the
timestamp -- especially while debugging hangs during bootups.
I don't know why this hasn't been implemened in the kernel yet, and
cannot think of a strong reason not to have it. Yes, the cpuid prefix will
take 5 more characters per line, but having the cpuid info is worth it,
I think.
Thanks,
Kiran
---
Add cpuid information to printk if CONFIG_PRINTK_TIME is enabled.
This information is useful to debug hangs and bootup issues.
Signed-off-by: Ravikiran Thirumalai <kiran@xxxxxxxxxxxx>
Index: linux-git/kernel/printk.c
===================================================================
--- linux-git.orig/kernel/printk.c 2008-09-16 15:37:48.000000000 -0700
+++ linux-git/kernel/printk.c 2008-09-18 12:27:10.489662938 -0700
@@ -739,9 +739,10 @@ asmlinkage int vprintk(const char *fmt,
t = cpu_clock(printk_cpu);
nanosec_rem = do_div(t, 1000000000);
- tlen = sprintf(tbuf, "[%5lu.%06lu] ",
+ tlen = sprintf(tbuf, "[%5lu.%06lu:%d] ",
(unsigned long) t,
- nanosec_rem / 1000);
+ nanosec_rem / 1000,
+ printk_cpu);
for (tp = tbuf; tp < tbuf + tlen; tp++)
emit_log_char(*tp);
--
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