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author | Thomas Gleixner <tglx@linutronix.de> | 2013-03-21 22:50:01 +0100 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2013-04-08 17:39:28 +0200 |
commit | 0dc8153cfebac68c9523b8852b14f10b31209f08 (patch) | |
tree | bed487eb3e6f5058f7a33bc33f6a75e8f9873961 /arch/tile/kernel/process.c | |
parent | e26ef8fe722d5c1c0c1a0212542da8fc2b21a89f (diff) | |
download | linux-0dc8153cfebac68c9523b8852b14f10b31209f08.tar.gz linux-0dc8153cfebac68c9523b8852b14f10b31209f08.tar.bz2 linux-0dc8153cfebac68c9523b8852b14f10b31209f08.zip |
tile: Use generic idle loop
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>
Link: http://lkml.kernel.org/r/20130321215235.348460344@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/tile/kernel/process.c')
-rw-r--r-- | arch/tile/kernel/process.c | 65 |
1 files changed, 9 insertions, 56 deletions
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c index caf93ae11793..80b2a18deb87 100644 --- a/arch/tile/kernel/process.c +++ b/arch/tile/kernel/process.c @@ -40,13 +40,11 @@ #include <arch/abi.h> #include <arch/sim_def.h> - /* * Use the (x86) "idle=poll" option to prefer low latency when leaving the * idle loop over low power while in the idle loop, e.g. if we have * one thread per core and we want to get threads out of futex waits fast. */ -static int no_idle_nap; static int __init idle_setup(char *str) { if (!str) @@ -54,64 +52,19 @@ static int __init idle_setup(char *str) if (!strcmp(str, "poll")) { pr_info("using polling idle threads.\n"); - no_idle_nap = 1; - } else if (!strcmp(str, "halt")) - no_idle_nap = 0; - else - return -1; - - return 0; + cpu_idle_poll_ctrl(true); + return 0; + } else if (!strcmp(str, "halt")) { + return 0; + } + return -1; } early_param("idle", idle_setup); -/* - * The idle thread. There's no useful work to be - * done, so just try to conserve power and have a - * low exit latency (ie sit in a loop waiting for - * somebody to say that they'd like to reschedule) - */ -void cpu_idle(void) +void arch_cpu_idle(void) { - int cpu = smp_processor_id(); - - - current_thread_info()->status |= TS_POLLING; - - if (no_idle_nap) { - while (1) { - while (!need_resched()) - cpu_relax(); - schedule(); - } - } - - /* endless idle loop with no priority at all */ - while (1) { - tick_nohz_idle_enter(); - rcu_idle_enter(); - while (!need_resched()) { - if (cpu_is_offline(cpu)) - BUG(); /* no HOTPLUG_CPU */ - - local_irq_disable(); - __get_cpu_var(irq_stat).idle_timestamp = jiffies; - current_thread_info()->status &= ~TS_POLLING; - /* - * TS_POLLING-cleared state must be visible before we - * test NEED_RESCHED: - */ - smp_mb(); - - if (!need_resched()) - _cpu_idle(); - else - local_irq_enable(); - current_thread_info()->status |= TS_POLLING; - } - rcu_idle_exit(); - tick_nohz_idle_exit(); - schedule_preempt_disabled(); - } + __get_cpu_var(irq_stat).idle_timestamp = jiffies; + _cpu_idle(); } /* |