diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2016-12-15 13:35:52 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-01-14 11:29:59 +0100 |
| commit | 9881b024b7d7671f6a014091bc96506b89081802 (patch) | |
| tree | 83319d1a51c4e7a880c329aaca38d9833dc8d4ce /include/linux/sched.h | |
| parent | 555570d744f8150d3fce6083f144026cd1e63627 (diff) | |
sched/clock: Delay switching sched_clock to stable
Currently we switch to the stable sched_clock if we guess the TSC is
usable, and then switch back to the unstable path if it turns out TSC
isn't stable during SMP bringup after all.
Delay switching to the stable path until after SMP bringup is
complete. This way we'll avoid switching during the time we detect the
worst of the TSC offences.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index ad3ec9ec61f7..94a48bb58297 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2515,6 +2515,10 @@ extern u64 sched_clock_cpu(int cpu); extern void sched_clock_init(void); #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK +static inline void sched_clock_init_late(void) +{ +} + static inline void sched_clock_tick(void) { } @@ -2537,6 +2541,7 @@ static inline u64 local_clock(void) return sched_clock(); } #else +extern void sched_clock_init_late(void); /* * Architectures can set this to 1 if they have specified * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, |