linux-toradex.git/arch/powerpc/include/asm/cputime.h, branch v3.2.37

powerpc: Fix wrong divisor in usecs_to_cputime

2012-07-25T03:11:38+00:00

commit 9f5072d4f63f28d30d343573830ac6c85fc0deff upstream.

Commit d57af9b (taskstats: use real microsecond granularity for CPU times)
renamed msecs_to_cputime to usecs_to_cputime, but failed to update all
numbers on the way.  This causes nonsensical cpu idle/iowait values to be
displayed in /proc/stat (the only user of usecs_to_cputime so far).

This also renames __cputime_msec_factor to __cputime_usec_factor, adapting
its value and using it directly in cputime_to_usecs instead of doing two
multiplications.

Signed-off-by: Andreas Schwab 
Acked-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Ben Hutchings

procfs: do not confuse jiffies with cputime64_t

2011-12-30T00:31:57+00:00

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 
Acked-by: Michal Hocko 
Cc: Arnd Bergmann 
Cc: "Artem S. Tashkinov" 
Cc: Dave Jones 
Cc: Alexey Dobriyan 
Cc: Thomas Gleixner 
Cc: "Luck, Tony" 
Cc: Benjamin Herrenschmidt 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

taskstats: use real microsecond granularity for CPU times

2010-10-28T01:03:17+00:00

The taskstats interface uses microsecond granularity for the user and
system time values.  The conversion from cputime to the taskstats values
uses the cputime_to_msecs primitive which effectively limits the
granularity to milliseconds.  Add the cputime_to_usecs primitive for
architectures that have better, more precise CPU time values.  Remove
cputime_to_msecs primitive because there are no more users left.

Signed-off-by: Michael Holzheu 
Acked-by: Balbir Singh 
Cc: Luck Tony 
Cc: Shailabh Nagar 
Cc: Martin Schwidefsky 
Cc: Oleg Nesterov 
Cc: Benjamin Herrenschmidt 
Cc: Heiko Carstens 
Cc: Thomas Gleixner 
Cc: Shailabh Nagar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

powerpc: Replace per_cpu(, smp_processor_id()) with __get_cpu_var()

2010-02-03T06:39:48+00:00

The cputime code has a few places that do per_cpu(, smp_processor_id()).
Replace them with __get_cpu_var().

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

cputime: Optimize jiffies_to_cputime(1)

2009-08-03T12:48:36+00:00

For powerpc with CONFIG_VIRT_CPU_ACCOUNTING
jiffies_to_cputime(1) is not compile time constant and run time
calculations are quite expensive. To optimize we use
precomputed value. For all other architectures is is
preprocessor definition.

Signed-off-by: Stanislaw Gruszka 
Acked-by: Peter Zijlstra 
Acked-by: Thomas Gleixner 
Cc: Oleg Nesterov 
Cc: Andrew Morton 
Cc: Paul Mackerras 
Cc: Benjamin Herrenschmidt 
LKML-Reference: <1248862529-6063-5-git-send-email-sgruszka@redhat.com>
Signed-off-by: Ingo Molnar

powerpc: Move include files to arch/powerpc/include/asm

2008-08-04T02:02:00+00:00

from include/asm-powerpc.  This is the result of a

mkdir arch/powerpc/include/asm
git mv include/asm-powerpc/* arch/powerpc/include/asm

Followed by a few documentation/comment fixups and a couple of places
where  was being used explicitly.  Of the latter only
one was outside the arch code and it is a driver only built for powerpc.

Signed-off-by: Stephen Rothwell 
Signed-off-by: Paul Mackerras