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| author | Ingo Molnar <mingo@elte.hu> | 2009-10-09 15:58:20 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-10-09 15:58:20 +0200 |
| commit | e7ab0f7b50bc4688fb5cf65de5d42e3b882fb8d1 (patch) | |
| tree | 448411e8204d9020f3d1fbbf7cabcad2932ada6d | |
| parent | f5dc37530ba8a35aae0f7f4f13781d1904f71e94 (diff) | |
| download | linux-e7ab0f7b50bc4688fb5cf65de5d42e3b882fb8d1.tar.gz linux-e7ab0f7b50bc4688fb5cf65de5d42e3b882fb8d1.tar.bz2 linux-e7ab0f7b50bc4688fb5cf65de5d42e3b882fb8d1.zip | |
Revert "x86, timers: Check for pending timers after (device) interrupts"
This reverts commit 9bcbdd9c58617f1301dd4f17c738bb9bc73aca70.
The real bug producing LatencyTop latencies has been fixed in:
f5dc375: sched: Update the clock of runqueue select_task_rq() selected
And the commit being reverted here triggers local timer processing
from every device IRQ. If device IRQs come in at a high frequency,
this could cause a performance regression.
The commit being reverted here purely 'fixed' the reported latency
as a side effect, because CPUs were being moved out of idle more
often.
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Frans Pop <elendil@planet.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <20091008064041.67219b13@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/irq.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/smp.c | 1 |
2 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index 391206199515..74656d1d4e30 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -244,7 +244,6 @@ unsigned int __irq_entry do_IRQ(struct pt_regs *regs) __func__, smp_processor_id(), vector, irq); } - run_local_timers(); irq_exit(); set_irq_regs(old_regs); @@ -269,7 +268,6 @@ void smp_generic_interrupt(struct pt_regs *regs) if (generic_interrupt_extension) generic_interrupt_extension(); - run_local_timers(); irq_exit(); set_irq_regs(old_regs); diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index d915d956e66d..ec1de97600e7 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -198,7 +198,6 @@ void smp_reschedule_interrupt(struct pt_regs *regs) { ack_APIC_irq(); inc_irq_stat(irq_resched_count); - run_local_timers(); /* * KVM uses this interrupt to force a cpu out of guest mode */ |