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[PATCH] tick-management: dyntick / highres functionality

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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>
This commit is contained in:
Thomas Gleixner
2007-02-16 01:28:03 -08:00
committed by Linus Torvalds
parent f8381cba04
commit 79bf2bb335
15 changed files with 1050 additions and 18 deletions
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15
kernel/softirq.c
View File

@@ -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();
}