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cputime: Default implementation of nsecs -> cputime conversion

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The architectures that override cputime_t (s390, ppc) don't provide
any version of nsecs_to_cputime(). Indeed this cputime_t implementation
by backend only happens when CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y under
which the core code doesn't make any use of nsecs_to_cputime().

At least for now.

We are going to make a broader use of it so lets provide a default
version with a per usecs granularity. It should be good enough for most
usecases.

Cc: Ingo Molnar <mingo@kernel.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Frederic Weisbecker 2014-03-05 16:33:42 +01:00
parent 69bb2600c9
commit bfc3f0281e
7 changed files with 17 additions and 6 deletions
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2
include/linux/kernel_stat.h
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@ -9,7 +9,7 @@
#include <linux/sched.h>
#include <linux/vtime.h>
#include <asm/irq.h>
#include <asm/cputime.h>
#include <linux/cputime.h>
/*
* 'kernel_stat.h' contains the definitions needed for doing