Hi all,
this patch series introduces stolen ticks accounting for Xen on ARM.
Stolen ticks are clocksource ticks that have been "stolen" from the cpu,
typically because Linux is running in a virtual machine and the vcpu has
been descheduled.
To account for these ticks we introduce CONFIG_PARAVIRT and pv_time_ops
so that we can make use of:
kernel/sched/cputime.c:steal_account_process_tick
Stefano Stabellini (4):
xen: move xen_setup_runstate_info and get_runstate_snapshot to
drivers/xen/time.c
kernel: missing include in cputime.c
arm: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops
xen/arm: account for stolen ticks
arch/arm/Kconfig | 20 +++++++++
arch/arm/include/asm/paravirt.h | 19 ++++++++
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/paravirt.c | 25 +++++++++++
arch/arm/xen/enlighten.c | 21 +++++++++
arch/ia64/xen/time.c | 48 +++------------------
arch/x86/xen/time.c | 76 +--------------------------------
drivers/xen/Makefile | 2 +-
drivers/xen/time.c | 91 +++++++++++++++++++++++++++++++++++++++
include/xen/xen-ops.h | 5 ++
kernel/sched/cputime.c | 1 +
11 files changed, 191 insertions(+), 118 deletions(-)
create mode 100644 arch/arm/include/asm/paravirt.h
create mode 100644 arch/arm/kernel/paravirt.c
create mode 100644 drivers/xen/time.c
git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen.git lost_ticks_4
Cheers,
Stefano
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