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x86: move warning message of polling idle and HT enabled

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The warning message at idle_setup() is never shown because
smp_num_sibling hasn't been updated at this point yet.

Move this polling idle and HT enabled warning to select_idle_routine().
I also implement this warning on 64-bit kernel.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Hiroshi Shimamoto 2008-01-30 13:33:18 +01:00 committed by Ingo Molnar
parent 2274c33ebd
commit 27415a4fe3
2 changed files with 24 additions and 11 deletions
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18
arch/x86/kernel/process_32.c
View file

@ -295,17 +295,27 @@ static int mwait_usable(const struct cpuinfo_x86 *c)
void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
{
static int selected;
if (selected)
return;
#ifdef CONFIG_X86_SMP
if (pm_idle == poll_idle && smp_num_siblings > 1) {
printk(KERN_WARNING "WARNING: polling idle and HT enabled,"
" performance may degrade.\n");
}
#endif
if (cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c)) {
printk("monitor/mwait feature present.\n");
/*
* Skip, if setup has overridden idle.
* One CPU supports mwait => All CPUs supports mwait
*/
if (!pm_idle) {
printk("using mwait in idle threads.\n");
printk(KERN_INFO "using mwait in idle threads.\n");
pm_idle = mwait_idle;
}
}
selected = 1;
}
static int __init idle_setup(char *str)
@ -313,10 +323,6 @@ static int __init idle_setup(char *str)
if (!strcmp(str, "poll")) {
printk("using polling idle threads.\n");
pm_idle = poll_idle;
#ifdef CONFIG_X86_SMP
if (smp_num_siblings > 1)
printk("WARNING: polling idle and HT enabled, performance may degrade.\n");
#endif
} else if (!strcmp(str, "mwait"))
force_mwait = 1;
else

17
arch/x86/kernel/process_64.c
View file

@ -291,20 +291,27 @@ static int mwait_usable(const struct cpuinfo_x86 *c)
void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
{
static int printed;
static int selected;
if (selected)
return;
#ifdef CONFIG_X86_SMP
if (pm_idle == poll_idle && smp_num_siblings > 1) {
printk(KERN_WARNING "WARNING: polling idle and HT enabled,"
" performance may degrade.\n");
}
#endif
if (cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c)) {
/*
* Skip, if setup has overridden idle.
* One CPU supports mwait => All CPUs supports mwait
*/
if (!pm_idle) {
if (!printed) {
printk(KERN_INFO "using mwait in idle threads.\n");
printed = 1;
}
printk(KERN_INFO "using mwait in idle threads.\n");
pm_idle = mwait_idle;
}
}
selected = 1;
}
static int __init idle_setup(char *str)