ARM: Add irqtime accounting support

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Add support for irq time accounting.  This commit prepares ARM by adding
the call to enable_sched_clock_irqtime() in sched_clock().  We introduce
a new kernel parameter - irqtime - which takes an integer.  -1 for auto,
0 for disabled, and 1 for enabled.  Auto mode selects IRQ accounting if
we have a sched_clock() tick rate greater than 1MHz.

Frederic Weisbecker is working on a patch set which moves the
IRQ_TIME_ACCOUNTING into arch/, so that part is not incorporated into
this patch; this facility becomes available on ARM only when both this
patch and Frederic's patches are merged.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Russell King 2012-09-09 18:39:28 +01:00

parent a67e1ce145

commit a42c362980

1 changed files with 8 additions and 0 deletions

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arch/arm/kernel/sched_clock.c

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