similar to: [PATCH 0/10] i386, VMI, BusLogic, Timer fixes for -mm

Convert VMI timer to use clock events, making it properly able to use the NO_HZ infrastructure. On UP systems, with no local APIC, we just continue to route these events through the PIT. On systems with a local APIC, or SMP, we provide a single source interrupt chip which creates the local timer IRQ. It actually gets delivered by the APIC hardware, but we don't want to use the same local

Convert VMI timer to use clock events, making it properly able to use the NO_HZ infrastructure. On UP systems, with no local APIC, we just continue to route these events through the PIT. On systems with a local APIC, or SMP, we provide a single source interrupt chip which creates the local timer IRQ. It actually gets delivered by the APIC hardware, but we don't want to use the same local

Critical bugfixes for the VMI-Timer code. 1) Do not setup a one shot alarm if we are keeping the periodic alarm armed. Additionally, since the periodic alarm can be run at a lower rate than HZ, let's fixup the guard to the no-idle-hz mode appropriately. This fixes the bug where the no-idle-hz mode might have a higher interrupt rate than the non-idle case. 2) The interrupt handler can no

Critical bugfixes for the VMI-Timer code. 1) Do not setup a one shot alarm if we are keeping the periodic alarm armed. Additionally, since the periodic alarm can be run at a lower rate than HZ, let's fixup the guard to the no-idle-hz mode appropriately. This fixes the bug where the no-idle-hz mode might have a higher interrupt rate than the non-idle case. 2) The interrupt handler can no

Ingo Molnar wrote: > * Ingo Molnar <mingo@elte.hu> wrote: > > >> no, that's not the case: next_timer_interrupt() is the NO_IDLE_HZ >> method of doing things - while in the NO_HZ case you are supposed to >> use clockevent devices to program timer hardware. >> We don't have a clockevent device. But we need NO_IDLE_HZ support, which NO_HZ

Ingo Molnar wrote: > * Ingo Molnar <mingo@elte.hu> wrote: > > >> no, that's not the case: next_timer_interrupt() is the NO_IDLE_HZ >> method of doing things - while in the NO_HZ case you are supposed to >> use clockevent devices to program timer hardware. >> We don't have a clockevent device. But we need NO_IDLE_HZ support, which NO_HZ

On Mon, 2007-03-05 at 13:06 +0100, Ingo Molnar wrote: > Subject: [patch] paravirt: VDSO page is essential > From: Ingo Molnar <mingo@elte.hu> > > commit 3bbf54725467d604698721384d858b5983b87e8f disables the VDSO for > CONFIG_PARAVIRT kernels. This #ifdeffery was a bad change: the VDSO is > an essential component of Linux, and this change forces all of them to > use

On Mon, 2007-03-05 at 13:06 +0100, Ingo Molnar wrote: > Subject: [patch] paravirt: VDSO page is essential > From: Ingo Molnar <mingo@elte.hu> > > commit 3bbf54725467d604698721384d858b5983b87e8f disables the VDSO for > CONFIG_PARAVIRT kernels. This #ifdeffery was a bad change: the VDSO is > an essential component of Linux, and this change forces all of them to > use

VMI is broken under COMPAT_VDSO, as Xen and other non hardware assisted hypervisors will be. I have been working on a fix for this which works for older glibcs that panic when the new relocatable VDSO is used. However, I believe at this time that the fix is going to be too radical to consider at this stage in the release of 2.6.21. We don't expect this config option to be turned on by

VMI is broken under COMPAT_VDSO, as Xen and other non hardware assisted hypervisors will be. I have been working on a fix for this which works for older glibcs that panic when the new relocatable VDSO is used. However, I believe at this time that the fix is going to be too radical to consider at this stage in the release of 2.6.21. We don't expect this config option to be turned on by

A NO_IDLE_HZ implementation is provided for i386 VMI builds. When a VCPU enters its idle loop, it disables its periodic alarm and sets up a one shot alarm for the next time event. That way, it does not become ready to run just to service the periodic alarm interrupt. Instead, it can remain halted until there is some real work pending for it. This allows the hypervisor to use the physical

A NO_IDLE_HZ implementation is provided for i386 VMI builds. When a VCPU enters its idle loop, it disables its periodic alarm and sets up a one shot alarm for the next time event. That way, it does not become ready to run just to service the periodic alarm interrupt. Instead, it can remain halted until there is some real work pending for it. This allows the hypervisor to use the physical

Implement vmi_kmap_atomic_pte in terms of the backend set_linear_mapping operation. The conversion is rather straighforward; call kmap_atomic and then inform the hypervisor of the page mapping. The _flush_tlb damage is due to macros being pulled in from highmem.h. Signed-off-by: Zachary Amsden <zach@vmware.com> diff -r 2207a31829e7 arch/i386/kernel/vmi.c --- a/arch/i386/kernel/vmi.c Mon

Implement vmi_kmap_atomic_pte in terms of the backend set_linear_mapping operation. The conversion is rather straighforward; call kmap_atomic and then inform the hypervisor of the page mapping. The _flush_tlb damage is due to macros being pulled in from highmem.h. Signed-off-by: Zachary Amsden <zach@vmware.com> diff -r 2207a31829e7 arch/i386/kernel/vmi.c --- a/arch/i386/kernel/vmi.c Mon

VMI timer code. It works by taking over the local APIC clock when APIC is configured, which requires a couple hooks into the APIC code. The backend timer code could be commonized into the timer infrastructure, but there are some pieces missing (stolen time, in particular), and the exact semantics of when to do accounting for NO_IDLE need to be shared between different hypervisors as well. So

VMI timer code. It works by taking over the local APIC clock when APIC is configured, which requires a couple hooks into the APIC code. The backend timer code could be commonized into the timer infrastructure, but there are some pieces missing (stolen time, in particular), and the exact semantics of when to do accounting for NO_IDLE need to be shared between different hypervisors as well. So

VMI timer code. It works by taking over the local APIC clock when APIC is configured, which requires a couple hooks into the APIC code. The backend timer code could be commonized into the timer infrastructure, but there are some pieces missing (stolen time, in particular), and the exact semantics of when to do accounting for NO_IDLE need to be shared between different hypervisors as well. So

VMI timer code. It works by taking over the local APIC clock when APIC is configured, which requires a couple hooks into the APIC code. The backend timer code could be commonized into the timer infrastructure, but there are some pieces missing (stolen time, in particular), and the exact semantics of when to do accounting for NO_IDLE need to be shared between different hypervisors as well. So

Now that the VDSO can be relocated, we can support it in VMI configurations. Signed-off-by: Zachary Amsden <zach@vmware.com> diff -r 158d9ffb46fe arch/i386/Kconfig --- a/arch/i386/Kconfig Thu Mar 29 04:17:05 2007 -0700 +++ b/arch/i386/Kconfig Thu Mar 29 04:18:05 2007 -0700 @@ -220,7 +220,7 @@ config PARAVIRT config VMI bool "VMI Paravirt-ops support" - depends on PARAVIRT

Now that the VDSO can be relocated, we can support it in VMI configurations. Signed-off-by: Zachary Amsden <zach@vmware.com> diff -r 158d9ffb46fe arch/i386/Kconfig --- a/arch/i386/Kconfig Thu Mar 29 04:17:05 2007 -0700 +++ b/arch/i386/Kconfig Thu Mar 29 04:18:05 2007 -0700 @@ -220,7 +220,7 @@ config PARAVIRT config VMI bool "VMI Paravirt-ops support" - depends on PARAVIRT