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sched-clock: Migrate to use new tick dependency mask model

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Instead of checking sched_clock_stable from the nohz subsystem to verify
its tick dependency, migrate it to the new mask in order to include it
to the all-in-one check.

Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Frederic Weisbecker 2015-07-22 17:03:52 +02:00
parent b78783000d
commit 4f49b90abb
2 changed files with 5 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
kernel/sched/clock.c
View File

@ -61,6 +61,7 @@
#include <linux/static_key.h>
#include <linux/workqueue.h>
#include <linux/compiler.h>
#include <linux/tick.h>
/*
* Scheduler clock - returns current time in nanosec units.
@ -89,6 +90,8 @@ static void __set_sched_clock_stable(void)
{
if (!sched_clock_stable())
static_key_slow_inc(&__sched_clock_stable);
tick_dep_clear(TICK_DEP_BIT_CLOCK_UNSTABLE);
}
void set_sched_clock_stable(void)
@ -108,6 +111,8 @@ static void __clear_sched_clock_stable(struct work_struct *work)
/* XXX worry about clock continuity */
if (sched_clock_stable())
static_key_slow_dec(&__sched_clock_stable);
tick_dep_set(TICK_DEP_BIT_CLOCK_UNSTABLE);
}
static DECLARE_WORK(sched_clock_work, __clear_sched_clock_stable);

19
kernel/time/tick-sched.c
View File

@ -204,25 +204,6 @@ static bool can_stop_full_tick(struct tick_sched *ts)
return false;
}
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
/*
* sched_clock_tick() needs us?
*
* TODO: kick full dynticks CPUs when
* sched_clock_stable is set.
*/
if (!sched_clock_stable()) {
trace_tick_stop(0, TICK_DEP_MASK_CLOCK_UNSTABLE);
/*
* Don't allow the user to think they can get
* full NO_HZ with this machine.
*/
WARN_ONCE(tick_nohz_full_running,
"NO_HZ FULL will not work with unstable sched clock");
return false;
}
#endif
return true;
}