From fdf9c356502ae02238efcdf90cefd7b473a63fd4 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Sun, 9 Sep 2012 14:56:31 +0200 Subject: cputime: Make finegrained irqtime accounting generally available There is no known reason for this option to be unavailable on other archs than x86. They just need to call enable_sched_clock_irqtime() if they have a sufficiently finegrained clock to make it working. Move it to the general option and let the user choose between it and pure tick based or virtual cputime accounting. Note that virtual cputime accounting already performs a finegrained irqtime accounting. CONFIG_IRQ_TIME_ACCOUNTING is a kind of middle ground between tick and virtual based accounting. So CONFIG_IRQ_TIME_ACCOUNTING and CONFIG_VIRT_CPU_ACCOUNTING are mutually exclusive choices. Signed-off-by: Frederic Weisbecker Cc: Tony Luck Cc: Fenghua Yu Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra --- arch/Kconfig | 6 ++++++ arch/x86/Kconfig | 12 +----------- 2 files changed, 7 insertions(+), 11 deletions(-) (limited to 'arch') diff --git a/arch/Kconfig b/arch/Kconfig index f78de57..101c31a 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -284,4 +284,10 @@ config SECCOMP_FILTER config HAVE_VIRT_CPU_ACCOUNTING bool +config HAVE_IRQ_TIME_ACCOUNTING + bool + help + Archs need to ensure they use a high enough resolution clock to + support irq time accounting and then call enable_sched_clock_irqtime(). + source "kernel/gcov/Kconfig" diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8ec3a1a..b86833a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -97,6 +97,7 @@ config X86 select KTIME_SCALAR if X86_32 select GENERIC_STRNCPY_FROM_USER select GENERIC_STRNLEN_USER + select HAVE_IRQ_TIME_ACCOUNTING config INSTRUCTION_DECODER def_bool (KPROBES || PERF_EVENTS || UPROBES) @@ -796,17 +797,6 @@ 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 IRQ_TIME_ACCOUNTING - bool "Fine granularity task level IRQ time accounting" - default n - ---help--- - Select this option to enable fine granularity task irq time - accounting. This is done by reading a timestamp on each - transitions between softirq and hardirq state, so there can be a - small performance impact. - - If in doubt, say N here. - source "kernel/Kconfig.preempt" config X86_UP_APIC -- cgit v1.1