[PATCH 00/10] vtime: Delay cputime accounting to tick

Frederic Weisbecker
2016-12-06T02:32:33Z

This follows up Martin Schwidefsky's patch which propose to delay
cputime accounting to the tick in order to minimize the calls to
account_system_time() and alikes as these functions can carry quite some
overhead:

http://lkml.kernel.org/r/20161121111728.13a0a3db@mschwide

The set includes Martin's patch, rebased on top of tip:sched/core and
latest s390 changes, and extends it to the other implementations of
CONFIG_VIRT_CPU_ACCOUNTING_NATIVE (powerpc and ia64) along with a few
core changes to adapt the whole.

Only built-tested though as I don't have access to any of these archs.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
vtime/acc

HEAD: ee6c393b212193bc01818c7cf4ae9cba3f469f00

Thanks,
Frederic
---

Frederic Weisbecker (9):
powerpc32: Fix stale scaled stime on context switch
ia64: Fix wrong start cputime assignment on task switch
cputime: Allow accounting system time using cpustat index
cputime: Export account_guest_time
powerpc: Prepare accounting structure for cputime flush on tick
powerpc: Migrate stolen_time field to accounting structure
powerpc/vtime: Accumulate cputime and account only on tick/task switch
ia64: Accumulate cputime and account only on tick/task switch
vtime: Rename vtime_account_user() to vtime_flush()

Martin Schwidefsky (1):
s390/cputime: delayed accounting of system time

arch/ia64/include/asm/thread_info.h | 6 ++
arch/ia64/kernel/time.c | 66 +++++++++++-----
arch/powerpc/include/asm/accounting.h | 14 +++-
arch/powerpc/include/asm/paca.h | 1 -
arch/powerpc/kernel/asm-offsets.c | 8 +-
arch/powerpc/kernel/time.c | 138 +++++++++++++++++++++-------------
arch/powerpc/xmon/xmon.c | 8 +-
arch/s390/include/asm/lowcore.h | 65 ++++++++--------
arch/s390/include/asm/processor.h | 3 +
arch/s390/kernel/vtime.c | 116 +++++++++++++++++-----------
include/linux/kernel_stat.h | 7 +-
include/linux/vtime.h | 7 +-
kernel/sched/cputime.c | 25 +++---
13 files changed, 295 insertions(+), 169 deletions(-)