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authorIngo Molnar <mingo@elte.hu>2009-10-09 09:58:20 -0400
committerIngo Molnar <mingo@elte.hu>2009-10-09 09:58:20 -0400
commite7ab0f7b50bc4688fb5cf65de5d42e3b882fb8d1 (patch)
tree448411e8204d9020f3d1fbbf7cabcad2932ada6d /arch/x86/kernel/smp.c
parentf5dc37530ba8a35aae0f7f4f13781d1904f71e94 (diff)
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>
Diffstat (limited to 'arch/x86/kernel/smp.c')
-rw-r--r--arch/x86/kernel/smp.c1
1 files changed, 0 insertions, 1 deletions
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)
198{ 198{
199 ack_APIC_irq(); 199 ack_APIC_irq();
200 inc_irq_stat(irq_resched_count); 200 inc_irq_stat(irq_resched_count);
201 run_local_timers();
202 /* 201 /*
203 * KVM uses this interrupt to force a cpu out of guest mode 202 * KVM uses this interrupt to force a cpu out of guest mode
204 */ 203 */