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authorThomas Gleixner <tglx@linutronix.de>2008-07-18 17:27:28 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-07-18 18:10:28 +0200
commitb8f8c3cf0a4ac0632ec3f0e15e9dc0c29de917af (patch)
tree183825db00f4e9252603a51a1be6f8874a963dbc /kernel
parent857f3fd7a496ddf4329345af65a4a2b16dd25fe8 (diff)
nohz: prevent tick stop outside of the idle loop
Jack Ren and Eric Miao tracked down the following long standing problem in the NOHZ code: scheduler switch to idle task enable interrupts Window starts here ----> interrupt happens (does not set NEED_RESCHED) irq_exit() stops the tick ----> interrupt happens (does set NEED_RESCHED) return from schedule() cpu_idle(): preempt_disable(); Window ends here The interrupts can happen at any point inside the race window. The first interrupt stops the tick, the second one causes the scheduler to rerun and switch away from idle again and we end up with the tick disabled. The fact that it needs two interrupts where the first one does not set NEED_RESCHED and the second one does made the bug obscure and extremly hard to reproduce and analyse. Kudos to Jack and Eric. Solution: Limit the NOHZ functionality to the idle loop to make sure that we can not run into such a situation ever again. cpu_idle() { preempt_disable(); while(1) { tick_nohz_stop_sched_tick(1); <- tell NOHZ code that we are in the idle loop while (!need_resched()) halt(); tick_nohz_restart_sched_tick(); <- disables NOHZ mode preempt_enable_no_resched(); schedule(); preempt_disable(); } } In hindsight we should have done this forever, but ... /me grabs a large brown paperbag. Debugged-by: Jack Ren <jack.ren@marvell.com>, Debugged-by: eric miao <eric.y.miao@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/softirq.c2
-rw-r--r--kernel/time/tick-sched.c12
2 files changed, 11 insertions, 3 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 36e061740047..05f248039d77 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -312,7 +312,7 @@ void irq_exit(void)
#ifdef CONFIG_NO_HZ
/* Make sure that timer wheel updates are propagated */
if (!in_interrupt() && idle_cpu(smp_processor_id()) && !need_resched())
- tick_nohz_stop_sched_tick();
+ tick_nohz_stop_sched_tick(0);
rcu_irq_exit();
#endif
preempt_enable_no_resched();
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 86baa4f0dfe4..ee962d11107b 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -195,7 +195,7 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
* Called either from the idle loop or from irq_exit() when an idle period was
* just interrupted by an interrupt which did not cause a reschedule.
*/
-void tick_nohz_stop_sched_tick(void)
+void tick_nohz_stop_sched_tick(int inidle)
{
unsigned long seq, last_jiffies, next_jiffies, delta_jiffies, flags;
struct tick_sched *ts;
@@ -224,6 +224,11 @@ void tick_nohz_stop_sched_tick(void)
if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))
goto end;
+ if (!inidle && !ts->inidle)
+ goto end;
+
+ ts->inidle = 1;
+
if (need_resched())
goto end;
@@ -372,11 +377,14 @@ void tick_nohz_restart_sched_tick(void)
local_irq_disable();
tick_nohz_stop_idle(cpu);
- if (!ts->tick_stopped) {
+ if (!ts->inidle || !ts->tick_stopped) {
+ ts->inidle = 0;
local_irq_enable();
return;
}
+ ts->inidle = 0;
+
rcu_exit_nohz();
/* Update jiffies first */