From abf917cd91cbb73952758f9741e2fa65002a48ee Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Wed, 25 Jul 2012 07:56:04 +0200 Subject: cputime: Generic on-demand virtual cputime accounting If we want to stop the tick further idle, we need to be able to account the cputime without using the tick. Virtual based cputime accounting solves that problem by hooking into kernel/user boundaries. However implementing CONFIG_VIRT_CPU_ACCOUNTING require low level hooks and involves more overhead. But we already have a generic context tracking subsystem that is required for RCU needs by archs which plan to shut down the tick outside idle. This patch implements a generic virtual based cputime accounting that relies on these generic kernel/user hooks. There are some upsides of doing this: - This requires no arch code to implement CONFIG_VIRT_CPU_ACCOUNTING if context tracking is already built (already necessary for RCU in full tickless mode). - We can rely on the generic context tracking subsystem to dynamically (de)activate the hooks, so that we can switch anytime between virtual and tick based accounting. This way we don't have the overhead of the virtual accounting when the tick is running periodically. And one downside: - There is probably more overhead than a native virtual based cputime accounting. But this relies on hooks that are already set anyway. Signed-off-by: Frederic Weisbecker Cc: Andrew Morton Cc: Ingo Molnar Cc: Li Zhong Cc: Namhyung Kim Cc: Paul E. McKenney Cc: Paul Gortmaker Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Thomas Gleixner --- init/Kconfig | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'init/Kconfig') diff --git a/init/Kconfig b/init/Kconfig index be8b7f5..a05f843 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -326,6 +326,9 @@ source "kernel/time/Kconfig" menu "CPU/Task time and stats accounting" +config VIRT_CPU_ACCOUNTING + bool + choice prompt "Cputime accounting" default TICK_CPU_ACCOUNTING if !PPC64 @@ -342,9 +345,10 @@ config TICK_CPU_ACCOUNTING If unsure, say Y. -config VIRT_CPU_ACCOUNTING +config VIRT_CPU_ACCOUNTING_NATIVE bool "Deterministic task and CPU time accounting" depends on HAVE_VIRT_CPU_ACCOUNTING + select VIRT_CPU_ACCOUNTING help Select this option to enable more accurate task and CPU time accounting. This is done by reading a CPU counter on each @@ -354,6 +358,23 @@ config VIRT_CPU_ACCOUNTING this also enables accounting of stolen time on logically-partitioned systems. +config VIRT_CPU_ACCOUNTING_GEN + bool "Full dynticks CPU time accounting" + depends on HAVE_CONTEXT_TRACKING && 64BIT + select VIRT_CPU_ACCOUNTING + select CONTEXT_TRACKING + help + Select this option to enable task and CPU time accounting on full + dynticks systems. This accounting is implemented by watching every + kernel-user boundaries using the context tracking subsystem. + The accounting is thus performed at the expense of some significant + overhead. + + For now this is only useful if you are working on the full + dynticks subsystem development. + + If unsure, say N. + config IRQ_TIME_ACCOUNTING bool "Fine granularity task level IRQ time accounting" depends on HAVE_IRQ_TIME_ACCOUNTING -- cgit v1.1