linux-kernel - Re: [PATCH 0/4] cputime: some optimizations and cleanups

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Date:   Wed, 9 Nov 2016 13:01:25 +0000
From:   Frederic Weisbecker <fweisbec@...il.com>
To:     Stanislaw Gruszka <sgruszka@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Neuling <mikey@...ling.org>,
        ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-s390 <linux-s390@...r.kernel.org>
Subject: Re: [PATCH 0/4] cputime: some optimizations and cleanups

2016-10-31 12:36 GMT+00:00 Stanislaw Gruszka <sgruszka@...hat.com>:
> Patches remove accounting of utimescaled/stimescaled on architectures
> that do not provide those values (scaled cputimes are equal to normal
> cputimes) what is every architecture except powerpc and s390.
>
> Patches do not change user visible behaviour.
>
> There is very little documentation how scaled cputimes should be
> interpreted and what useful information they provide (at least
> I could not find that). Moreover they are exported to user-space
> only via not commonly used taskstats and delayacct interfaces (i.e.
> interfaces that are not used by standard linux tools AFICT). However
> I assume they can not be removed by whole (i.e. replaced by normal
> utimes/stimes on powerpc and s390).
>
> Stanislaw Gruszka (4):
>   cputime/powerpc: remove cputime_last_delta global variable
>   cputime/powerpc: remove cputime_to_scaled()
>   cputime/powerpc/s390: make scaled cputime arch specific
>   cputime: simplify task_cputime()
>
>  arch/ia64/kernel/time.c               |    4 +-
>  arch/powerpc/Kconfig                  |    1 +
>  arch/powerpc/include/asm/cputime.h    |   14 ----
>  arch/powerpc/kernel/time.c            |    8 +-
>  arch/s390/Kconfig                     |    1 +
>  arch/s390/kernel/vtime.c              |    9 ++-
>  arch/x86/kernel/apm_32.c              |    4 +-
>  include/asm-generic/cputime_jiffies.h |    1 -
>  include/asm-generic/cputime_nsecs.h   |    1 -
>  include/linux/kernel_stat.h           |    4 +-
>  include/linux/sched.h                 |   29 +++++---
>  kernel/fork.c                         |    2 +
>  kernel/sched/cputime.c                |  124 +++++++++------------------------
>  kernel/time/posix-cpu-timers.c        |    4 +-
>  14 files changed, 73 insertions(+), 133 deletions(-)
>

Excellent patchset!
Thanks a lot Stanislaw!

Acked-by: Frederic Weisbecker <fweisbec@...il.com>