procfs: do not confuse jiffies with cputime64_t
authorAndreas Schwab <schwab@linux-m68k.org>
Wed, 28 Dec 2011 23:57:15 +0000 (15:57 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 30 Dec 2011 00:31:57 +0000 (16:31 -0800)
commit34845636a184f3be91a531098192592cbe6db587
tree1c216e37f536a71dae94e41db3f1e059f9ac70a5
parente26a51148f3ebd859bca8bf2e0f212839b447f62
procfs: do not confuse jiffies with cputime64_t

Commit 2a95ea6c0d129b4 ("procfs: do not overflow get_{idle,iowait}_time
for nohz") did not take into account that one some architectures jiffies
and cputime use different units.

This causes get_idle_time() to return numbers in the wrong units, making
the idle time fields in /proc/stat wrong.

Instead of converting the usec value returned by
get_cpu_{idle,iowait}_time_us to units of jiffies, use the new function
usecs_to_cputime64 to convert it to the correct unit of cputime64_t.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Artem S. Tashkinov" <t.artem@mailcity.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/ia64/include/asm/cputime.h
arch/powerpc/include/asm/cputime.h
arch/s390/include/asm/cputime.h
fs/proc/stat.c
include/asm-generic/cputime.h