| Message ID | 20190701185528.078114514@asus.localdomain (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | cpuidle haltpoll driver and governor (v5) | expand |
On Mon, Jul 1, 2019 at 8:57 PM Marcelo Tosatti <mtosatti@redhat.com> wrote: > > Add a cpuidle driver that calls the architecture default_idle routine. > > To be used in conjunction with the haltpoll governor. > > Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > --- > arch/x86/kernel/process.c | 2 - > drivers/cpuidle/Kconfig | 9 +++++ > drivers/cpuidle/Makefile | 1 > drivers/cpuidle/cpuidle-haltpoll.c | 65 +++++++++++++++++++++++++++++++++++++ > 4 files changed, 76 insertions(+), 1 deletion(-) > > Index: linux-2.6-newcpuidle.git/arch/x86/kernel/process.c > =================================================================== > --- linux-2.6-newcpuidle.git.orig/arch/x86/kernel/process.c > +++ linux-2.6-newcpuidle.git/arch/x86/kernel/process.c > @@ -580,7 +580,7 @@ void __cpuidle default_idle(void) > safe_halt(); > trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id()); > } > -#ifdef CONFIG_APM_MODULE > +#if defined(CONFIG_APM_MODULE) || defined(CONFIG_HALTPOLL_CPUIDLE_MODULE) > EXPORT_SYMBOL(default_idle); > #endif > > Index: linux-2.6-newcpuidle.git/drivers/cpuidle/Kconfig > =================================================================== > --- linux-2.6-newcpuidle.git.orig/drivers/cpuidle/Kconfig > +++ linux-2.6-newcpuidle.git/drivers/cpuidle/Kconfig > @@ -51,6 +51,15 @@ depends on PPC > source "drivers/cpuidle/Kconfig.powerpc" > endmenu > > +config HALTPOLL_CPUIDLE > + tristate "Halt poll cpuidle driver" > + depends on X86 && KVM_GUEST > + default y > + help > + This option enables halt poll cpuidle driver, which allows to poll > + before halting in the guest (more efficient than polling in the > + host via halt_poll_ns for some scenarios). > + > endif > > config ARCH_NEEDS_CPU_IDLE_COUPLED > Index: linux-2.6-newcpuidle.git/drivers/cpuidle/Makefile > =================================================================== > --- linux-2.6-newcpuidle.git.orig/drivers/cpuidle/Makefile > +++ linux-2.6-newcpuidle.git/drivers/cpuidle/Makefile > @@ -7,6 +7,7 @@ obj-y += cpuidle.o driver.o governor.o s > obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o > obj-$(CONFIG_DT_IDLE_STATES) += dt_idle_states.o > obj-$(CONFIG_ARCH_HAS_CPU_RELAX) += poll_state.o > +obj-$(CONFIG_HALTPOLL_CPUIDLE) += cpuidle-haltpoll.o > > ################################################################################## > # ARM SoC drivers > Index: linux-2.6-newcpuidle.git/drivers/cpuidle/cpuidle-haltpoll.c > =================================================================== > --- /dev/null > +++ linux-2.6-newcpuidle.git/drivers/cpuidle/cpuidle-haltpoll.c > @@ -0,0 +1,69 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * cpuidle driver for haltpoll governor. > + * > + * Copyright 2019 Red Hat, Inc. and/or its affiliates. > + * > + * This work is licensed under the terms of the GNU GPL, version 2. See > + * the COPYING file in the top-level directory. > + * > + * Authors: Marcelo Tosatti <mtosatti@redhat.com> > + */ > + > +#include <linux/init.h> > +#include <linux/cpuidle.h> > +#include <linux/module.h> > +#include <linux/sched/idle.h> > +#include <linux/kvm_para.h> > + > +static int default_enter_idle(struct cpuidle_device *dev, > + struct cpuidle_driver *drv, int index) > +{ > + if (current_clr_polling_and_test()) { > + local_irq_enable(); > + return index; > + } > + default_idle(); > + return index; > +} > + > +static struct cpuidle_driver haltpoll_driver = { > + .name = "haltpoll", > + .owner = THIS_MODULE, > + .states = { > + { /* entry 0 is for polling */ }, > + { > + .enter = default_enter_idle, > + .exit_latency = 1, > + .target_residency = 1, > + .power_usage = -1, > + .name = "haltpoll idle", > + .desc = "default architecture idle", > + }, > + }, > + .safe_state_index = 0, > + .state_count = 2, > +}; > + > +static int __init haltpoll_init(void) > +{ > + struct cpuidle_driver *drv = &haltpoll_driver; > + > + cpuidle_poll_state_init(drv); > + > + if (!kvm_para_available()) > + return 0; > + > + return cpuidle_register(&haltpoll_driver, NULL); > +} > + > +static void __exit haltpoll_exit(void) > +{ > + cpuidle_unregister(&haltpoll_driver); > +} > + > +module_init(haltpoll_init); > +module_exit(haltpoll_exit); > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Marcelo Tosatti <mtosatti@redhat.com>"); > + > >
Index: linux-2.6-newcpuidle.git/arch/x86/kernel/process.c =================================================================== --- linux-2.6-newcpuidle.git.orig/arch/x86/kernel/process.c +++ linux-2.6-newcpuidle.git/arch/x86/kernel/process.c @@ -580,7 +580,7 @@ void __cpuidle default_idle(void) safe_halt(); trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id()); } -#ifdef CONFIG_APM_MODULE +#if defined(CONFIG_APM_MODULE) || defined(CONFIG_HALTPOLL_CPUIDLE_MODULE) EXPORT_SYMBOL(default_idle); #endif Index: linux-2.6-newcpuidle.git/drivers/cpuidle/Kconfig =================================================================== --- linux-2.6-newcpuidle.git.orig/drivers/cpuidle/Kconfig +++ linux-2.6-newcpuidle.git/drivers/cpuidle/Kconfig @@ -51,6 +51,15 @@ depends on PPC source "drivers/cpuidle/Kconfig.powerpc" endmenu +config HALTPOLL_CPUIDLE + tristate "Halt poll cpuidle driver" + depends on X86 && KVM_GUEST + default y + help + This option enables halt poll cpuidle driver, which allows to poll + before halting in the guest (more efficient than polling in the + host via halt_poll_ns for some scenarios). + endif config ARCH_NEEDS_CPU_IDLE_COUPLED Index: linux-2.6-newcpuidle.git/drivers/cpuidle/Makefile =================================================================== --- linux-2.6-newcpuidle.git.orig/drivers/cpuidle/Makefile +++ linux-2.6-newcpuidle.git/drivers/cpuidle/Makefile @@ -7,6 +7,7 @@ obj-y += cpuidle.o driver.o governor.o s obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o obj-$(CONFIG_DT_IDLE_STATES) += dt_idle_states.o obj-$(CONFIG_ARCH_HAS_CPU_RELAX) += poll_state.o +obj-$(CONFIG_HALTPOLL_CPUIDLE) += cpuidle-haltpoll.o ################################################################################## # ARM SoC drivers Index: linux-2.6-newcpuidle.git/drivers/cpuidle/cpuidle-haltpoll.c =================================================================== --- /dev/null +++ linux-2.6-newcpuidle.git/drivers/cpuidle/cpuidle-haltpoll.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * cpuidle driver for haltpoll governor. + * + * Copyright 2019 Red Hat, Inc. and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + * Authors: Marcelo Tosatti <mtosatti@redhat.com> + */ + +#include <linux/init.h> +#include <linux/cpuidle.h> +#include <linux/module.h> +#include <linux/sched/idle.h> +#include <linux/kvm_para.h> + +static int default_enter_idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + if (current_clr_polling_and_test()) { + local_irq_enable(); + return index; + } + default_idle(); + return index; +} + +static struct cpuidle_driver haltpoll_driver = { + .name = "haltpoll", + .owner = THIS_MODULE, + .states = { + { /* entry 0 is for polling */ }, + { + .enter = default_enter_idle, + .exit_latency = 1, + .target_residency = 1, + .power_usage = -1, + .name = "haltpoll idle", + .desc = "default architecture idle", + }, + }, + .safe_state_index = 0, + .state_count = 2, +}; + +static int __init haltpoll_init(void) +{ + struct cpuidle_driver *drv = &haltpoll_driver; + + cpuidle_poll_state_init(drv); + + if (!kvm_para_available()) + return 0; + + return cpuidle_register(&haltpoll_driver, NULL); +} + +static void __exit haltpoll_exit(void) +{ + cpuidle_unregister(&haltpoll_driver); +} + +module_init(haltpoll_init); +module_exit(haltpoll_exit); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marcelo Tosatti <mtosatti@redhat.com>"); +
Add a cpuidle driver that calls the architecture default_idle routine. To be used in conjunction with the haltpoll governor. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> --- arch/x86/kernel/process.c | 2 - drivers/cpuidle/Kconfig | 9 +++++ drivers/cpuidle/Makefile | 1 drivers/cpuidle/cpuidle-haltpoll.c | 65 +++++++++++++++++++++++++++++++++++++ 4 files changed, 76 insertions(+), 1 deletion(-)