linux-kernel - [patch] sched_clock(): cleanups, #2

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Date:	Fri, 25 May 2007 13:50:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Satyam Sharma <satyam.sharma@...il.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [patch] sched_clock(): cleanups, #2


* Ingo Molnar <mingo@...e.hu> wrote:

> * Andi Kleen <andi@...stfloor.org> wrote:
> 
> > > please send me your current sched-clock.c, i'll redo any remaining 
> > > cleanups.
> > 
> > It needs at least one new preliminary patch (to add on_cpu_single);
> > please get the series from 
> > ftp://ftp.firstfloor.org/pub/ak/x86_64/quilt/patches-2.6.22-rc2-git7-070525-1.tar.gz
> > You need at least tsc-unstable upto paravirt-add-a-sched_clock-paravirt
> > for everything
> 
> thanks.
> 
> you missed one patch: please pick up the NUMAQ change i did too. (i 
> kept the printk to make sure someone notices that and actually tests 
> thing - i dont have a NUMAQ machine to try this on.)
> 
> i'm looking at the other things now.

find below the cleanups from my first patch that didnt make it into your 
cleanups. (plus one more cleanup i noticed while merging the missing 
bits from my first patch) Goes after the bugfix i just sent. Please 
apply.

	Ingo

---------------------->
Subject: [patch] sched_clock(): cleanups, #2
From: Ingo Molnar <mingo@...e.hu>

clean up sched-clock.c - the missing bits.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/i386/kernel/sched-clock.c |   20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

Index: linux-cfs-2.6.22-rc2-mm1.q/arch/i386/kernel/sched-clock.c
===================================================================
--- linux-cfs-2.6.22-rc2-mm1.q.orig/arch/i386/kernel/sched-clock.c
+++ linux-cfs-2.6.22-rc2-mm1.q/arch/i386/kernel/sched-clock.c
@@ -89,8 +89,10 @@ unsigned long long native_sched_clock(vo
 	return r;
 }
 
-/* We need to define a real function for sched_clock, to override the
-   weak default version */
+/*
+ * We need to define a real function for sched_clock, to override the
+ * weak default version
+ */
 #ifdef CONFIG_PARAVIRT
 unsigned long long sched_clock(void)
 {
@@ -119,6 +121,9 @@ static void resolve_freq(struct cpufreq_
 {
 	if (!freq->new) {
 		freq->new = cpufreq_get(freq->cpu);
+		/*
+		 * Still no frequency? Then fall back to tsc_khz:
+		 */
 		if (!freq->new)
 			freq->new = tsc_khz;
 	}
@@ -129,6 +134,7 @@ static void resync_freq(void *arg)
 {
 	struct cpufreq_freqs *freq = (void *)arg;
 	struct sc_data *sc = &__get_cpu_var(sc_data);
+
 	sc->sync_base = jiffies;
 	if (!cpu_has_tsc) {
 		sc->unstable = 1;
@@ -155,13 +161,14 @@ static void resync_freq(void *arg)
 static void resync_freq_on_cpu(void *arg)
 {
 	struct cpufreq_freqs f = { .new = 0 };
+
 	f.cpu = get_cpu();
 	resync_freq(&f);
 	put_cpu();
 }
 
-static int sc_freq_event(struct notifier_block *nb, unsigned long event,
-			 void *data)
+static int
+sc_freq_event(struct notifier_block *nb, unsigned long event, void *data)
 {
 	struct cpufreq_freqs *freq = data;
 	struct sc_data *sc;
@@ -210,8 +217,10 @@ static int __cpuinit
 sc_cpu_event(struct notifier_block *self, unsigned long event, void *hcpu)
 {
 	long cpu = (long)hcpu;
+
 	if (event == CPU_ONLINE) {
 		struct cpufreq_freqs f = { .cpu = cpu, .new = 0 };
+
 		on_cpu_single(cpu, resync_freq, &f);
 	}
 	return NOTIFY_DONE;
@@ -221,7 +230,6 @@ static __init int init_sched_clock(void)
 {
 	if (unsynchronized_tsc())
 		no_sc_for_printk = 1;
-
 	/*
 	 * On a race between the various events the initialization
 	 * might be done multiple times, but code is tolerant to
@@ -231,7 +239,7 @@ static __init int init_sched_clock(void)
 				CPUFREQ_TRANSITION_NOTIFIER);
 	hotcpu_notifier(sc_cpu_event, 0);
 	on_each_cpu(resync_freq_on_cpu, NULL, 0, 0);
+
 	return 0;
 }
 core_initcall(init_sched_clock);
-
-
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