diff options
| author | Len Brown <len.brown@intel.com> | 2006-10-14 02:25:59 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2006-10-14 02:25:59 -0400 |
| commit | d7321ad2936c48a95af5187d4d676118cb59aa5f (patch) | |
| tree | 238e1ca71ca6cc148204d00335f16cff329d7903 /arch/i386/kernel/process.c | |
| parent | 1d5b30fc339fe2865599c70486abccc18200317d (diff) | |
| parent | 991528d7348667924176f3e29addea0675298944 (diff) | |
Pull mwait into test branch
Diffstat (limited to 'arch/i386/kernel/process.c')
| -rw-r--r-- | arch/i386/kernel/process.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c index b0a07801d9df..57d375900afb 100644 --- a/arch/i386/kernel/process.c +++ b/arch/i386/kernel/process.c @@ -236,20 +236,28 @@ EXPORT_SYMBOL_GPL(cpu_idle_wait); * We execute MONITOR against need_resched and enter optimized wait state * through MWAIT. Whenever someone changes need_resched, we would be woken * up from MWAIT (without an IPI). + * + * New with Core Duo processors, MWAIT can take some hints based on CPU + * capability. */ -static void mwait_idle(void) +void mwait_idle_with_hints(unsigned long eax, unsigned long ecx) { - local_irq_enable(); - - while (!need_resched()) { + if (!need_resched()) { __monitor((void *)¤t_thread_info()->flags, 0, 0); smp_mb(); - if (need_resched()) - break; - __mwait(0, 0); + if (!need_resched()) + __mwait(eax, ecx); } } +/* Default MONITOR/MWAIT with no hints, used for default C1 state */ +static void mwait_idle(void) +{ + local_irq_enable(); + while (!need_resched()) + mwait_idle_with_hints(0, 0); +} + void __devinit select_idle_routine(const struct cpuinfo_x86 *c) { if (cpu_has(c, X86_FEATURE_MWAIT)) { |