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authorThomas Gleixner <tglx@linutronix.de>2007-02-16 01:28:03 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 08:13:59 -0800
commit79bf2bb335b85db25d27421c798595a2fa2a0e82 (patch)
tree550ec2654ae1dd65b871de7fe9c890108c6e86d8 /kernel/softirq.c
parentf8381cba04ba8173fd5a2b8e5cd8b3290ee13a98 (diff)
[PATCH] tick-management: dyntick / highres functionality
With Ingo Molnar <mingo@elte.hu> Add functions to provide dynamic ticks and high resolution timers. The code which keeps track of jiffies and handles the long idle periods is shared between tick based and high resolution timer based dynticks. The dyntick functionality can be disabled on the kernel commandline. Provide also the infrastructure to support high resolution timers. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/softirq.c')
-rw-r--r--kernel/softirq.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 14e1a14f94d..8b75008e2bd 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -17,6 +17,7 @@
#include <linux/kthread.h>
#include <linux/rcupdate.h>
#include <linux/smp.h>
+#include <linux/tick.h>
#include <asm/irq.h>
/*
@@ -278,9 +279,11 @@ EXPORT_SYMBOL(do_softirq);
*/
void irq_enter(void)
{
- account_system_vtime(current);
- add_preempt_count(HARDIRQ_OFFSET);
- trace_hardirq_enter();
+ __irq_enter();
+#ifdef CONFIG_NO_HZ
+ if (idle_cpu(smp_processor_id()))
+ tick_nohz_update_jiffies();
+#endif
}
#ifdef __ARCH_IRQ_EXIT_IRQS_DISABLED
@@ -299,6 +302,12 @@ void irq_exit(void)
sub_preempt_count(IRQ_EXIT_OFFSET);
if (!in_interrupt() && local_softirq_pending())
invoke_softirq();
+
+#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();
+#endif
preempt_enable_no_resched();
}