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sched/x86: Change CONFIG_SCHED_ITMT to CONFIG_SCHED_MC_PRIO

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Rename CONFIG_SCHED_ITMT for Intel Turbo Boost Max Technology 3.0
to CONFIG_SCHED_MC_PRIO.  This makes the configuration extensible
in future to other architectures that wish to similarly establish
CPU core priorities support in the scheduler.

The description in Kconfig is updated to reflect this change with
added details for better clarity.  The configuration is explicitly
default-y, to enable the feature on CPUs that have this feature.

It has no effect on non-TBM3 CPUs.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bp@suse.de
Cc: jolsa@redhat.com
Cc: linux-acpi@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Cc: rjw@rjwysocki.net
Link: http://lkml.kernel.org/r/2b2ee29d93e3f162922d72d0165a1405864fbb23.1480444902.git.tim.c.chen@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Tim Chen 2016-11-29 10:43:27 -08:00 committed by Ingo Molnar
parent a293b3954a
commit de966cf4a4
5 changed files with 22 additions and 12 deletions
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22
arch/x86/Kconfig
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@ -939,14 +939,24 @@ config SCHED_MC
making when dealing with multi-core CPU chips at a cost of slightly
increased overhead in some places. If unsure say N here.
config SCHED_ITMT
bool "Intel Turbo Boost Max Technology (ITMT) scheduler support"
config SCHED_MC_PRIO
bool "CPU core priorities scheduler support"
depends on SCHED_MC && CPU_SUP_INTEL && X86_INTEL_PSTATE
default y
---help---
ITMT enabled scheduler support improves the CPU scheduler's decision
to move tasks to cpu core that can be boosted to a higher frequency
than others. It will have better performance at a cost of slightly
increased overhead in task migrations. If unsure say N here.
Intel Turbo Boost Max Technology 3.0 enabled CPUs have a
core ordering determined at manufacturing time, which allows
certain cores to reach higher turbo frequencies (when running
single threaded workloads) than others.
Enabling this kernel feature teaches the scheduler about
the TBM3 (aka ITMT) priority order of the CPU cores and adjusts the
scheduler's CPU selection logic accordingly, so that higher
overall system performance can be achieved.
This feature will have no effect on CPUs without this feature.
If unsure say Y here.
source "kernel/Kconfig.preempt"

6
arch/x86/include/asm/topology.h
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@ -148,7 +148,7 @@ void x86_pci_root_bus_resources(int bus, struct list_head *resources);
extern bool x86_topology_update;
#ifdef CONFIG_SCHED_ITMT
#ifdef CONFIG_SCHED_MC_PRIO
#include <asm/percpu.h>
DECLARE_PER_CPU_READ_MOSTLY(int, sched_core_priority);
@ -163,7 +163,7 @@ int sched_set_itmt_support(void);
/* Interface to notify scheduler that system revokes ITMT support */
void sched_clear_itmt_support(void);
#else /* CONFIG_SCHED_ITMT */
#else /* CONFIG_SCHED_MC_PRIO */
#define sysctl_sched_itmt_enabled 0
static inline void sched_set_itmt_core_prio(int prio, int core_cpu)
@ -176,6 +176,6 @@ static inline int sched_set_itmt_support(void)
static inline void sched_clear_itmt_support(void)
{
}
#endif /* CONFIG_SCHED_ITMT */
#endif /* CONFIG_SCHED_MC_PRIO */
#endif /* _ASM_X86_TOPOLOGY_H */

2
arch/x86/kernel/Makefile
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@ -123,7 +123,7 @@ obj-$(CONFIG_EFI) += sysfb_efi.o
obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
obj-$(CONFIG_TRACING) += tracepoint.o
obj-$(CONFIG_SCHED_ITMT) += itmt.o
obj-$(CONFIG_SCHED_MC_PRIO) += itmt.o
ifdef CONFIG_FRAME_POINTER
obj-y += unwind_frame.o

2
drivers/acpi/bus.c
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@ -338,7 +338,7 @@ static void acpi_bus_osc_support(void)
}
#endif
if (IS_ENABLED(CONFIG_SCHED_ITMT))
if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
if (!ghes_disable)

2
drivers/cpufreq/Kconfig.x86
View File

@ -6,7 +6,7 @@ config X86_INTEL_PSTATE
bool "Intel P state control"
depends on X86
select ACPI_PROCESSOR if ACPI
select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_ITMT
select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO
help
This driver provides a P state for Intel core processors.
The driver implements an internal governor and will become