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[PATCH] i386/x86-64/ia64: Move polling flag into thread_info_status

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During some profiling I noticed that default_idle causes a lot of
memory traffic. I think that is caused by the atomic operations
to clear/set the polling flag in thread_info. There is actually
no reason to make this atomic - only the idle thread does it
to itself, other CPUs only read it. So I moved it into ti->status.

Converted i386/x86-64/ia64 for now because that was the easiest
way to fix ACPI which also manipulates these flags in its idle
function.

Cc: Nick Piggin <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Len Brown <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andi Kleen 2006-06-26 13:59:11 +02:00 • committed by Linus Torvalds
commit 495ab9c045
9 changed files with 37 additions and 25 deletions
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9
kernel/sched.c
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@ -818,6 +818,11 @@ static void deactivate_task(struct task_struct *p, runqueue_t *rq)
* the target CPU.
*/
#ifdef CONFIG_SMP
#ifndef tsk_is_polling
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif
static void resched_task(task_t *p)
{
int cpu;
@ -833,9 +838,9 @@ static void resched_task(task_t *p)
if (cpu == smp_processor_id())
return;
/* NEED_RESCHED must be visible before we test POLLING_NRFLAG */
/* NEED_RESCHED must be visible before we test polling */
smp_mb();
if (!test_tsk_thread_flag(p, TIF_POLLING_NRFLAG))
if (!tsk_is_polling(p))
smp_send_reschedule(cpu);
}
#else