search for: hlt

Hi all, I am wondering about the following suggested change: In isolinux.asm, line 50 (at least in my Debian patched version), add the line "hlt" inside the "DO_IDLE" macro. Explanation: When running isolinux on a vmware box, the boot menu takes up all available CPU. This change seems to solve this problem. I have read elsewhere that such a change will not go in, as the system is set up to perform polling. From looking at...

...R) TXT for measured launch by ensuring that all shutdowns will call the necessary hook to tear down the measured environment. It also centralizes any future shutdown-related changes. The patch also postpones clearing the online status APs in stop_this_cpu() until just before putting them into the hlt loop. This ensures that when machine_teardown() checks that all APs have finished their shutdown, that they have really have completed all interesting tasks. This applies to the staging tree as of today. Joe # HG changeset patch # User Joseph Cihula <joseph.cihula@intel.com> # Date 118921...

...> + > + for_each_online_cpu(i) { > + setup_cpuidle(i); > + } > + > + return 0; > +} > + > void __init xen_arch_setup(void) > { > xen_panic_handler_init(); > @@ -354,7 +394,7 @@ void __init xen_arch_setup(void) > #ifdef CONFIG_X86_32 > boot_cpu_data.hlt_works_ok = 1; > #endif > - pm_idle = default_idle; > + xen_idle_init(); > boot_option_idle_override = IDLE_HALT; > > fiddle_vdso(); > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordom...

...local_irq_disable() __asm__ __volatile__("cli": : :"memory") -#define local_irq_enable() __asm__ __volatile__("sti": : :"memory") -/* used in the idle loop; sti takes one instruction cycle to complete */ -#define safe_halt() __asm__ __volatile__("sti; hlt": : :"memory") -/* used when interrupts are already enabled or to shutdown the processor */ -#define halt() __asm__ __volatile__("hlt": : :"memory") - +#define local_irq_save(x) do { typecheck(unsigned long,x); local_save_flags(x); local_irq_disable(); } while (...

...local_irq_disable() __asm__ __volatile__("cli": : :"memory") -#define local_irq_enable() __asm__ __volatile__("sti": : :"memory") -/* used in the idle loop; sti takes one instruction cycle to complete */ -#define safe_halt() __asm__ __volatile__("sti; hlt": : :"memory") -/* used when interrupts are already enabled or to shutdown the processor */ -#define halt() __asm__ __volatile__("hlt": : :"memory") - +#define local_irq_save(x) do { typecheck(unsigned long,x); local_save_flags(x); local_irq_disable(); } while (...

Use halt() instead (respective mainline patch will be submitted soon). Signed-off-by: Jan Beulich <jbeulich@novell.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

The bug report says vmxassist is only used on Intel processors. The applied patch doesn't seem to check for the cpu vendor - should it or we don't care? I assume a FV Xen VM on AMD will burn some cycles if unused and idle (unlike now). Sebastian

...service for everyone else. You replied to the work-around discussed in the earlier thread at http://syslinux.zytor.com/archives/2005-June/005291.html > Breaks serial console. > -hpa In our case, the serial console is not an issue. We would like to submit a patch to isolinux which HLTs on getchar if isolinux is not running with the serial console option. Do you think this is the right solution to this problem? Can we work with you to resolve this? Thanks, -Peter Iannucci MIT Student Information Processing Board -------------- next part -------------- A non-text attachment w...

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Keir, below/attached patch is necessary to allow SVM partitions to boot unmodified guests with xen-unstable.hg c/s 8961. c/s 8822 and 8828 (some necessary evtchn modifications) cause SVM partitions to fail with "lost interrupt" hda error during boot. We currently do not understand why these modifications are necessary and in fact, a race occurs with one part of the patch (added

...ossible under KVM or any other hypervisor. KVM allows any VCPU to wake up a currently halted VCPU of its choice, see Documentation/virtual/kvm/hypercalls.txt. 5. KVM_HC_KICK_CPU ------------------------ Architecture: x86 Status: active Purpose: Hypercall used to wakeup a vcpu from HLT state Usage example : A vcpu of a paravirtualized guest that is busywaiting in guest kernel mode for an event to occur (ex: a spinlock to become available) can execute HLT instruction once it has busy-waited for more than a threshold time-interval. Execution of HLT instruction would cau...

...age that contains parts of supervisor visible register state. The guest can map this shared page to access its supervisor register through memory using this hypercall. + +5. KVM_HC_KICK_CPU +------------------------ +Architecture: x86 +Status: active +Purpose: Hypercall used to wakeup a vcpu from HLT state +Usage example : A vcpu of a paravirtualized guest that is busywaiting in guest +kernel mode for an event to occur (ex: a spinlock to become available) can +execute HLT instruction once it has busy-waited for more than a threshold +time-interval. Execution of HLT instruction would cause the h...

Hello everybody After doing a MANOVA on a bunch of data, I want to be able to make some comment on the amount of variation in the data that is explained by the factor of interest. I want to say this in the following way: XX% of the data is explained by A. I can acheive something like what I want by doing the following: X <- structure(c(9, 6, 9, 3, 2, 7), .Dim = as.integer(c(3,

...e state's residency time to make decisions about probabilistic polling, as @dev->last_residency does. it is much easier to get data. 2. do a HV specific idle driver (function) so far, power management is not exposed to guest.. idle is simple for KVM guest, calling "sti" / "hlt"(cpuidle_idle_call() --> default_idle_call()).. thanks Xen guys, who has implemented the paravirt framework. I can implement it as easy as following: ???????????? --- a/arch/x86/kernel/kvm.c ???????????? +++ b/arch/x86/kernel/kvm.c ???????????? @@ -465,6 +465,12 @@ static void __init...

...e state's residency time to make decisions about probabilistic polling, as @dev->last_residency does. it is much easier to get data. 2. do a HV specific idle driver (function) so far, power management is not exposed to guest.. idle is simple for KVM guest, calling "sti" / "hlt"(cpuidle_idle_call() --> default_idle_call()).. thanks Xen guys, who has implemented the paravirt framework. I can implement it as easy as following: ???????????? --- a/arch/x86/kernel/kvm.c ???????????? +++ b/arch/x86/kernel/kvm.c ???????????? @@ -465,6 +465,12 @@ static void __init...

On 26/02/14 15:14, Waiman Long wrote: > This patch adds para-virtualization support to the queue spinlock code > by enabling the queue head to kick the lock holder CPU, if known, > in when the lock isn't released for a certain amount of time. It > also enables the mutual monitoring of the queue head CPU and the > following node CPU in the queue to make sure that their CPUs will

On 26/02/14 15:14, Waiman Long wrote: > This patch adds para-virtualization support to the queue spinlock code > by enabling the queue head to kick the lock holder CPU, if known, > in when the lock isn't released for a certain amount of time. It > also enables the mutual monitoring of the queue head CPU and the > following node CPU in the queue to make sure that their CPUs will

...olution for drivers when using VT-x processors. See for example : http://lists.xensource.com/archives/html/xen-devel/2005-12/msg00763.html My question is this; As I understand, the VMX support in the new VT-x processors enables us to prevent Guest OSs from performing unwanted instructions (HLT , for example). This is done by using the root and non-root VMX operation. Thus , we don''t use paravirtualization and we can run unmodified guest. Is there a possibility or any intention of using the backend-frontend solution of Xen (maybe with some fixes) when using VT-x processors ? w...

...; I use a heart-beat counter to see if the other side responses within a > certain time limit. If not, I assume it has been scheduled out probably > due to PLE. PLE is unnecessary if you have "true" pv spinlocks where the next-in-line schedules itself out with a hypercall (Xen) or hlt instruction (KVM). Set a bit in the qspinlock before going to sleep, and the lock owner will know that it needs to kick the next-in-line. I think there is no need for the unfair lock bits. 1-2% is a pretty large hit. Paolo

...; I use a heart-beat counter to see if the other side responses within a > certain time limit. If not, I assume it has been scheduled out probably > due to PLE. PLE is unnecessary if you have "true" pv spinlocks where the next-in-line schedules itself out with a hypercall (Xen) or hlt instruction (KVM). Set a bit in the qspinlock before going to sleep, and the lock owner will know that it needs to kick the next-in-line. I think there is no need for the unfair lock bits. 1-2% is a pretty large hit. Paolo