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authorVenkatesh Pallipadi <venki@google.com>2010-10-05 02:03:20 +0200
committerIngo Molnar <mingo@elte.hu>2010-10-18 20:52:25 +0200
commite82b8e4ea4f3dffe6e7939f90e78da675fcc450e (patch)
tree116e54691f87d2cb0f2f5df36d1e114624c225d0 /arch/x86/Kconfig
parentsched: Add IRQ_TIME_ACCOUNTING, finer accounting of irq time (diff)
downloadlinux-e82b8e4ea4f3dffe6e7939f90e78da675fcc450e.tar.xz
linux-e82b8e4ea4f3dffe6e7939f90e78da675fcc450e.zip
x86: Add IRQ_TIME_ACCOUNTING
This patch adds IRQ_TIME_ACCOUNTING option on x86 and runtime enables it when TSC is enabled. This change just enables fine grained irq time accounting, isn't used yet. Following patches use it for different purposes. Signed-off-by: Venkatesh Pallipadi <venki@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1286237003-12406-6-git-send-email-venki@google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/Kconfig')
-rw-r--r--arch/x86/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index cea0cd9a316f..f4c70c246ffe 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -795,6 +795,17 @@ 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