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authorFrederic Weisbecker <fweisbec@gmail.com>2014-03-05 16:33:42 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2014-03-13 15:56:43 +0100
commitbfc3f0281e08066fa8111c3972cff6edc1049864 (patch)
tree6050b264fecd05de99bdff0dd6c98e8594ed70a4 /include/linux/cputime.h
parent69bb2600c9f8ca450fede9633edf9c2513c9ee6f (diff)
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cputime: Default implementation of nsecs -> cputime conversion
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>
Diffstat (limited to 'include/linux/cputime.h')
-rw-r--r--include/linux/cputime.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/cputime.h b/include/linux/cputime.h
new file mode 100644
index 0000000..2842ebe
--- /dev/null
+++ b/include/linux/cputime.h
@@ -0,0 +1,11 @@
+#ifndef __LINUX_CPUTIME_H
+#define __LINUX_CPUTIME_H
+
+#include <asm/cputime.h>
+
+#ifndef nsecs_to_cputime
+# define nsecs_to_cputime(__nsecs) \
+ usecs_to_cputime((__nsecs) / NSEC_PER_USEC)
+#endif
+
+#endif /* __LINUX_CPUTIME_H */
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