From: tony@bakeyournoodle•com (Tony Breeds)
To: LinuxPPC-dev <linuxppc-dev@ozlabs•org>
Subject: [PATCH/RFC] Modify sched_clock() to make CONFIG_PRINTK_TIME more sane.
Date: Tue, 19 Jun 2007 16:35:57 +1000 [thread overview]
Message-ID: <20070619063557.GK9768@bakeyournoodle.com> (raw)
When booting a current kernel with CONFIG_PRINTK_TIME enabled you'll
see messages like:
[ 0.000000] time_init: decrementer frequency = 188.044000 MHz
[ 0.000000] time_init: processor frequency = 1504.352000 MHz
[3712914.436297] Console: colour dummy device 80x25
This patch modifies sched_clock() to report the offset since the machine booted
so the same printk's now look like:
[ 0.000000] time_init: decrementer frequency = 188.044000 MHz
[ 0.000000] time_init: processor frequency = 1504.352000 MHz
[ 0.000135] Console: colour dummy device 80x25
Effectivly including the uptime in printk()s.
Signed-off-by: Tony Breeds <tony@bakeyournoodle•com>
---
arch/powerpc/kernel/time.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
Index: working/arch/powerpc/kernel/time.c
===================================================================
--- working.orig/arch/powerpc/kernel/time.c
+++ working/arch/powerpc/kernel/time.c
@@ -115,6 +115,7 @@ EXPORT_SYMBOL_GPL(rtc_lock);
u64 tb_to_ns_scale;
unsigned tb_to_ns_shift;
+unsigned long boot_tb;
struct gettimeofday_struct do_gtod;
@@ -735,7 +736,7 @@ unsigned long long sched_clock(void)
{
if (__USE_RTC())
return get_rtc();
- return mulhdu(get_tb(), tb_to_ns_scale) << tb_to_ns_shift;
+ return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift;
}
int do_settimeofday(struct timespec *tv)
@@ -960,6 +961,8 @@ void __init time_init(void)
}
tb_to_ns_scale = scale;
tb_to_ns_shift = shift;
+ /* Save the current timebase to pretty up CONFIG_PRINTK_TIME */
+ boot_tb = get_tb();
tm = get_boot_time();
Yours Tony
linux.conf.au http://linux.conf.au/ || http://lca2008.linux.org.au/
Jan 28 - Feb 02 2008 The Australian Linux Technical Conference!
next reply other threads:[~2007-06-19 6:36 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-19 6:35 Tony Breeds [this message]
2007-06-19 6:43 ` [PATCH/RFC] Modify sched_clock() to make CONFIG_PRINTK_TIME more sane Segher Boessenkool
2007-06-19 14:53 ` Olof Johansson
2007-06-20 2:02 ` Tony Breeds
2007-06-20 2:27 ` Olof Johansson
2007-06-20 3:13 ` [PATCH/RFC] Make certain timekeeping variables __read_mostly Tony Breeds
2007-06-20 7:41 ` Geert Uytterhoeven
2007-06-21 4:41 ` Tony Breeds
2007-06-20 7:37 ` [PATCH/RFC] Modify sched_clock() to make CONFIG_PRINTK_TIME more sane Geert Uytterhoeven
2007-06-21 4:29 ` Tony Breeds
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