sched: Move all scheduler bits into kernel/sched/

There's too many sched*.[ch] files in kernel/, give them their own
directory.

(No code changed, other than Makefile glue added.)

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 350 deletions

diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
deleted file mode 100644
index c685e31..0000000
--- a/kernel/sched_clock.c
+++ /dev/null
@@ -1,350 +0,0 @@
-/*
- * sched_clock for unstable cpu clocks
- *
- *  Copyright (C) 2008 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
- *
- *  Updates and enhancements:
- *    Copyright (C) 2008 Red Hat, Inc. Steven Rostedt <srostedt@redhat.com>
- *
- * Based on code by:
- *   Ingo Molnar <mingo@redhat.com>
- *   Guillaume Chazarain <guichaz@gmail.com>
- *
- *
- * What:
- *
- * cpu_clock(i) provides a fast (execution time) high resolution
- * clock with bounded drift between CPUs. The value of cpu_clock(i)
- * is monotonic for constant i. The timestamp returned is in nanoseconds.
- *
- * ######################### BIG FAT WARNING ##########################
- * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
- * # go backwards !!                                                  #
- * ####################################################################
- *
- * There is no strict promise about the base, although it tends to start
- * at 0 on boot (but people really shouldn't rely on that).
- *
- * cpu_clock(i)       -- can be used from any context, including NMI.
- * sched_clock_cpu(i) -- must be used with local IRQs disabled (implied by NMI)
- * local_clock()      -- is cpu_clock() on the current cpu.
- *
- * How:
- *
- * The implementation either uses sched_clock() when
- * !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK, which means in that case the
- * sched_clock() is assumed to provide these properties (mostly it means
- * the architecture provides a globally synchronized highres time source).
- *
- * Otherwise it tries to create a semi stable clock from a mixture of other
- * clocks, including:
- *
- *  - GTOD (clock monotomic)
- *  - sched_clock()
- *  - explicit idle events
- *
- * We use GTOD as base and use sched_clock() deltas to improve resolution. The
- * deltas are filtered to provide monotonicity and keeping it within an
- * expected window.
- *
- * Furthermore, explicit sleep and wakeup hooks allow us to account for time
- * that is otherwise invisible (TSC gets stopped).
- *
- *
- * Notes:
- *
- * The !IRQ-safetly of sched_clock() and sched_clock_cpu() comes from things
- * like cpufreq interrupts that can change the base clock (TSC) multiplier
- * and cause funny jumps in time -- although the filtering provided by
- * sched_clock_cpu() should mitigate serious artifacts we cannot rely on it
- * in general since for !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK we fully rely on
- * sched_clock().
- */
-#include <linux/spinlock.h>
-#include <linux/hardirq.h>
-#include <linux/export.h>
-#include <linux/percpu.h>
-#include <linux/ktime.h>
-#include <linux/sched.h>
-
-/*
- * Scheduler clock - returns current time in nanosec units.
- * This is default implementation.
- * Architectures and sub-architectures can override this.
- */
-unsigned long long __attribute__((weak)) sched_clock(void)
-{
-	return (unsigned long long)(jiffies - INITIAL_JIFFIES)
-					* (NSEC_PER_SEC / HZ);
-}
-EXPORT_SYMBOL_GPL(sched_clock);
-
-__read_mostly int sched_clock_running;
-
-#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
-__read_mostly int sched_clock_stable;
-
-struct sched_clock_data {
-	u64			tick_raw;
-	u64			tick_gtod;
-	u64			clock;
-};
-
-static DEFINE_PER_CPU_SHARED_ALIGNED(struct sched_clock_data, sched_clock_data);
-
-static inline struct sched_clock_data *this_scd(void)
-{
-	return &__get_cpu_var(sched_clock_data);
-}
-
-static inline struct sched_clock_data *cpu_sdc(int cpu)
-{
-	return &per_cpu(sched_clock_data, cpu);
-}
-
-void sched_clock_init(void)
-{
-	u64 ktime_now = ktime_to_ns(ktime_get());
-	int cpu;
-
-	for_each_possible_cpu(cpu) {
-		struct sched_clock_data *scd = cpu_sdc(cpu);
-
-		scd->tick_raw = 0;
-		scd->tick_gtod = ktime_now;
-		scd->clock = ktime_now;
-	}
-
-	sched_clock_running = 1;
-}
-
-/*
- * min, max except they take wrapping into account
- */
-
-static inline u64 wrap_min(u64 x, u64 y)
-{
-	return (s64)(x - y) < 0 ? x : y;
-}
-
-static inline u64 wrap_max(u64 x, u64 y)
-{
-	return (s64)(x - y) > 0 ? x : y;
-}
-
-/*
- * update the percpu scd from the raw @now value
- *
- *  - filter out backward motion
- *  - use the GTOD tick value to create a window to filter crazy TSC values
- */
-static u64 sched_clock_local(struct sched_clock_data *scd)
-{
-	u64 now, clock, old_clock, min_clock, max_clock;
-	s64 delta;
-
-again:
-	now = sched_clock();
-	delta = now - scd->tick_raw;
-	if (unlikely(delta < 0))
-		delta = 0;
-
-	old_clock = scd->clock;
-
-	/*
-	 * scd->clock = clamp(scd->tick_gtod + delta,
-	 *		      max(scd->tick_gtod, scd->clock),
-	 *		      scd->tick_gtod + TICK_NSEC);
-	 */
-
-	clock = scd->tick_gtod + delta;
-	min_clock = wrap_max(scd->tick_gtod, old_clock);
-	max_clock = wrap_max(old_clock, scd->tick_gtod + TICK_NSEC);
-
-	clock = wrap_max(clock, min_clock);
-	clock = wrap_min(clock, max_clock);
-
-	if (cmpxchg64(&scd->clock, old_clock, clock) != old_clock)
-		goto again;
-
-	return clock;
-}
-
-static u64 sched_clock_remote(struct sched_clock_data *scd)
-{
-	struct sched_clock_data *my_scd = this_scd();
-	u64 this_clock, remote_clock;
-	u64 *ptr, old_val, val;
-
-	sched_clock_local(my_scd);
-again:
-	this_clock = my_scd->clock;
-	remote_clock = scd->clock;
-
-	/*
-	 * Use the opportunity that we have both locks
-	 * taken to couple the two clocks: we take the
-	 * larger time as the latest time for both
-	 * runqueues. (this creates monotonic movement)
-	 */
-	if (likely((s64)(remote_clock - this_clock) < 0)) {
-		ptr = &scd->clock;
-		old_val = remote_clock;
-		val = this_clock;
-	} else {
-		/*
-		 * Should be rare, but possible:
-		 */
-		ptr = &my_scd->clock;
-		old_val = this_clock;
-		val = remote_clock;
-	}
-
-	if (cmpxchg64(ptr, old_val, val) != old_val)
-		goto again;
-
-	return val;
-}
-
-/*
- * Similar to cpu_clock(), but requires local IRQs to be disabled.
- *
- * See cpu_clock().
- */
-u64 sched_clock_cpu(int cpu)
-{
-	struct sched_clock_data *scd;
-	u64 clock;
-
-	WARN_ON_ONCE(!irqs_disabled());
-
-	if (sched_clock_stable)
-		return sched_clock();
-
-	if (unlikely(!sched_clock_running))
-		return 0ull;
-
-	scd = cpu_sdc(cpu);
-
-	if (cpu != smp_processor_id())
-		clock = sched_clock_remote(scd);
-	else
-		clock = sched_clock_local(scd);
-
-	return clock;
-}
-
-void sched_clock_tick(void)
-{
-	struct sched_clock_data *scd;
-	u64 now, now_gtod;
-
-	if (sched_clock_stable)
-		return;
-
-	if (unlikely(!sched_clock_running))
-		return;
-
-	WARN_ON_ONCE(!irqs_disabled());
-
-	scd = this_scd();
-	now_gtod = ktime_to_ns(ktime_get());
-	now = sched_clock();
-
-	scd->tick_raw = now;
-	scd->tick_gtod = now_gtod;
-	sched_clock_local(scd);
-}
-
-/*
- * We are going deep-idle (irqs are disabled):
- */
-void sched_clock_idle_sleep_event(void)
-{
-	sched_clock_cpu(smp_processor_id());
-}
-EXPORT_SYMBOL_GPL(sched_clock_idle_sleep_event);
-
-/*
- * We just idled delta nanoseconds (called with irqs disabled):
- */
-void sched_clock_idle_wakeup_event(u64 delta_ns)
-{
-	if (timekeeping_suspended)
-		return;
-
-	sched_clock_tick();
-	touch_softlockup_watchdog();
-}
-EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
-
-/*
- * As outlined at the top, provides a fast, high resolution, nanosecond
- * time source that is monotonic per cpu argument and has bounded drift
- * between cpus.
- *
- * ######################### BIG FAT WARNING ##########################
- * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
- * # go backwards !!                                                  #
- * ####################################################################
- */
-u64 cpu_clock(int cpu)
-{
-	u64 clock;
-	unsigned long flags;
-
-	local_irq_save(flags);
-	clock = sched_clock_cpu(cpu);
-	local_irq_restore(flags);
-
-	return clock;
-}
-
-/*
- * Similar to cpu_clock() for the current cpu. Time will only be observed
- * to be monotonic if care is taken to only compare timestampt taken on the
- * same CPU.
- *
- * See cpu_clock().
- */
-u64 local_clock(void)
-{
-	u64 clock;
-	unsigned long flags;
-
-	local_irq_save(flags);
-	clock = sched_clock_cpu(smp_processor_id());
-	local_irq_restore(flags);
-
-	return clock;
-}
-
-#else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
-
-void sched_clock_init(void)
-{
-	sched_clock_running = 1;
-}
-
-u64 sched_clock_cpu(int cpu)
-{
-	if (unlikely(!sched_clock_running))
-		return 0;
-
-	return sched_clock();
-}
-
-u64 cpu_clock(int cpu)
-{
-	return sched_clock_cpu(cpu);
-}
-
-u64 local_clock(void)
-{
-	return sched_clock_cpu(0);
-}
-
-#endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
-
-EXPORT_SYMBOL_GPL(cpu_clock);
-EXPORT_SYMBOL_GPL(local_clock);