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authorPavel Tatashin <pasha.tatashin@oracle.com>2018-07-19 16:55:41 -0400
committerThomas Gleixner <tglx@linutronix.de>2018-07-20 00:02:43 +0200
commit5d2a4e91a541cb04d20d11602f0f9340291322ac (patch)
treea73289b20244f7a057b30a71fc7fefddfa294632 /kernel/sched
parent4763f03d3d186ce8a1125844790152d76804ad60 (diff)
downloadlinux-5d2a4e91a541cb04d20d11602f0f9340291322ac.tar.bz2
sched/clock: Move sched clock initialization and merge with generic clock
sched_clock_postinit() initializes a generic clock on systems where no other clock is provided. This function may be called only after timekeeping_init(). Rename sched_clock_postinit to generic_clock_inti() and call it from sched_clock_init(). Move the call for sched_clock_init() until after time_init(). Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: schwidefsky@de.ibm.com Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: douly.fnst@cn.fujitsu.com Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Cc: pbonzini@redhat.com Link: https://lkml.kernel.org/r/20180719205545.16512-23-pasha.tatashin@oracle.com
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/clock.c27
-rw-r--r--kernel/sched/core.c1
2 files changed, 17 insertions, 11 deletions
diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c
index 10c83e73837a..0e9dbb2d9aea 100644
--- a/kernel/sched/clock.c
+++ b/kernel/sched/clock.c
@@ -53,6 +53,7 @@
*
*/
#include "sched.h"
+#include <linux/sched_clock.h>
/*
* Scheduler clock - returns current time in nanosec units.
@@ -68,11 +69,6 @@ EXPORT_SYMBOL_GPL(sched_clock);
__read_mostly int sched_clock_running;
-void sched_clock_init(void)
-{
- sched_clock_running = 1;
-}
-
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
/*
* We must start with !__sched_clock_stable because the unstable -> stable
@@ -199,6 +195,15 @@ void clear_sched_clock_stable(void)
__clear_sched_clock_stable();
}
+static void __sched_clock_gtod_offset(void)
+{
+ __gtod_offset = (sched_clock() + __sched_clock_offset) - ktime_get_ns();
+}
+
+void __init sched_clock_init(void)
+{
+ sched_clock_running = 1;
+}
/*
* We run this as late_initcall() such that it runs after all built-in drivers,
* notably: acpi_processor and intel_idle, which can mark the TSC as unstable.
@@ -385,8 +390,6 @@ void sched_clock_tick(void)
void sched_clock_tick_stable(void)
{
- u64 gtod, clock;
-
if (!sched_clock_stable())
return;
@@ -398,9 +401,7 @@ void sched_clock_tick_stable(void)
* TSC to be unstable, any computation will be computing crap.
*/
local_irq_disable();
- gtod = ktime_get_ns();
- clock = sched_clock();
- __gtod_offset = (clock + __sched_clock_offset) - gtod;
+ __sched_clock_gtod_offset();
local_irq_enable();
}
@@ -434,6 +435,12 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
#else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
+void __init sched_clock_init(void)
+{
+ sched_clock_running = 1;
+ generic_sched_clock_init();
+}
+
u64 sched_clock_cpu(int cpu)
{
if (unlikely(!sched_clock_running))
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index fe365c9a08e9..552406e9713b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5954,7 +5954,6 @@ void __init sched_init(void)
int i, j;
unsigned long alloc_size = 0, ptr;
- sched_clock_init();
wait_bit_init();
#ifdef CONFIG_FAIR_GROUP_SCHED