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| author | Peter Zijlstra <peterz@infradead.org> | 2017-12-21 15:06:50 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-03-09 07:59:19 +0100 |
| commit | 00357f5ec5d67a52a175da6f29f85c2c19d59bc8 (patch) | |
| tree | 53799544850786339539ed2d7f39ff03a1f321b1 /kernel/time | |
| parent | e022e0d38ad475fc650f22efa3deb2fb96e62542 (diff) | |
| download | linux-00357f5ec5d67a52a175da6f29f85c2c19d59bc8.tar.bz2 | |
sched/nohz: Clean up nohz enter/exit
The primary observation is that nohz enter/exit is always from the
current CPU, therefore NOHZ_TICK_STOPPED does not in fact need to be
an atomic.
Secondary is that we appear to have 2 nearly identical hooks in the
nohz enter code, set_cpu_sd_state_idle() and
nohz_balance_enter_idle(). Fold the whole set_cpu_sd_state thing into
nohz_balance_{enter,exit}_idle.
Removes an atomic op from both enter and exit paths.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
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 'kernel/time')
| -rw-r--r-- | kernel/time/tick-sched.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index f2fa2e940fe5..ab92aa4442df 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -954,13 +954,6 @@ void tick_nohz_idle_enter(void) struct tick_sched *ts; lockdep_assert_irqs_enabled(); - /* - * Update the idle state in the scheduler domain hierarchy - * when tick_nohz_stop_sched_tick() is called from the idle loop. - * State will be updated to busy during the first busy tick after - * exiting idle. - */ - set_cpu_sd_state_idle(); local_irq_disable(); |