Add support for core- and socket-scheduling in the Xen hypervisor.
Via boot parameter sched-gran=core (or sched-gran=socket)
it is possible to change the scheduling granularity from cpu (the
default) to either whole cores or even sockets.
All logical cpus (threads) of the core or socket are always scheduled
together. This means that on a core always vcpus of the same domain
will be active, and those vcpus will always be scheduled at the same
time.
This is achieved by switching the scheduler to no longer see vcpus as
the primary object to schedule, but "schedule units". Each schedule
unit consists of as many vcpus as each core has threads on the current
system. The vcpu->unit relation is fixed.
I have done some very basic performance testing: on a 4 cpu system
(2 cores with 2 threads each) I did a "make -j 4" for building the Xen
hypervisor. With This test has been run on dom0, once with no other
guest active and once with another guest with 4 vcpus running the same
test. The results are (always elapsed time, system time, user time):
sched-gran=cpu, no other guest: 116.10 177.65 207.84
sched-gran=core, no other guest: 114.04 175.47 207.45
sched-gran=cpu, other guest: 202.30 334.21 384.63
sched-gran=core, other guest: 207.24 293.04 371.37
The performance tests have been performed with credit2, the other
schedulers are tested only briefly to be able to create a domain in a
cpupool.
Cpupools have been moderately tested (cpu add/remove, create, destroy,
move domain).
Cpu on-/offlining has been moderately tested, too.
The series is based on the series:
"xen/sched: use new idle scheduler for free cpus"
which has been split off from V1.
The complete patch series is available under:
git://github.com/jgross1/xen/ sched-v2
Changes in V2:
- comments addressed
- some patches merged into one
- idle scheduler related patches split off to own series
- some patches are already applied
- some bugs fixed (e.g. crashes when powering off)
Changes in V1:
- cpupools are working now
- cpu on-/offlining working now
- all schedulers working now
- renamed "items" to "units"
- introduction of "idle scheduler"
- several new patches (see individual patches, mostly splits of
former patches or cpupool and cpu on-/offlining support)
- all review comments addressed
- some minor changes (see individual patches)
Changes in RFC V2:
- ARM is building now
- HVM domains are working now
- idling will always be done with idle_vcpu active
- other small changes see individual patches
Juergen Gross (48):
xen/sched: use new sched_unit instead of vcpu in scheduler interfaces
xen/sched: move per-vcpu scheduler private data pointer to sched_unit
xen/sched: build a linked list of struct sched_unit
xen/sched: introduce struct sched_resource
xen/sched: let pick_cpu return a scheduler resource
xen/sched: switch schedule_data.curr to point at sched_unit
xen/sched: move per cpu scheduler private data into struct
sched_resource
xen/sched: switch vcpu_schedule_lock to unit_schedule_lock
xen/sched: move some per-vcpu items to struct sched_unit
xen/sched: add scheduler helpers hiding vcpu
xen/sched: rename scheduler related perf counters
xen/sched: switch struct task_slice from vcpu to sched_unit
xen/sched: add is_running indicator to struct sched_unit
xen/sched: make null scheduler vcpu agnostic.
xen/sched: make rt scheduler vcpu agnostic.
xen/sched: make credit scheduler vcpu agnostic.
xen/sched: make credit2 scheduler vcpu agnostic.
xen/sched: make arinc653 scheduler vcpu agnostic.
xen: add sched_unit_pause_nosync() and sched_unit_unpause()
xen: let vcpu_create() select processor
xen/sched: use sched_resource cpu instead smp_processor_id in
schedulers
xen/sched: switch schedule() from vcpus to sched_units
xen/sched: switch sched_move_irqs() to take sched_unit as parameter
xen: switch from for_each_vcpu() to for_each_sched_unit()
xen/sched: add runstate counters to struct sched_unit
xen/sched: rework and rename vcpu_force_reschedule()
xen/sched: Change vcpu_migrate_*() to operate on schedule unit
xen/sched: move struct task_slice into struct sched_unit
xen/sched: add code to sync scheduling of all vcpus of a sched unit
xen/sched: introduce unit_runnable_state()
xen/sched: add support for multiple vcpus per sched unit where missing
xen/sched: modify cpupool_domain_cpumask() to be an unit mask
xen/sched: support allocating multiple vcpus into one sched unit
xen/sched: add a percpu resource index
xen/sched: add fall back to idle vcpu when scheduling unit
xen/sched: make vcpu_wake() and vcpu_sleep() core scheduling aware
xen/sched: carve out freeing sched_unit memory into dedicated function
xen/sched: move per-cpu variable scheduler to struct sched_resource
xen/sched: move per-cpu variable cpupool to struct sched_resource
xen/sched: reject switching smt on/off with core scheduling active
xen/sched: prepare per-cpupool scheduling granularity
xen/sched: split schedule_cpu_switch()
xen/sched: protect scheduling resource via rcu
xen/sched: support multiple cpus per scheduling resource
xen/sched: support differing granularity in schedule_cpu_[add/rm]()
xen/sched: support core scheduling for moving cpus to/from cpupools
xen/sched: disable scheduling when entering ACPI deep sleep states
xen/sched: add scheduling granularity enum
xen/arch/arm/domain.c | 2 +-
xen/arch/arm/domain_build.c | 13 +-
xen/arch/x86/Kconfig | 1 +
xen/arch/x86/acpi/cpu_idle.c | 1 -
xen/arch/x86/acpi/power.c | 4 +
xen/arch/x86/cpu/mcheck/mce.c | 1 -
xen/arch/x86/cpu/mcheck/mctelem.c | 1 -
xen/arch/x86/dom0_build.c | 10 +-
xen/arch/x86/domain.c | 26 +-
xen/arch/x86/hvm/dom0_build.c | 9 +-
xen/arch/x86/pv/dom0_build.c | 10 +-
xen/arch/x86/pv/shim.c | 4 +-
xen/arch/x86/setup.c | 1 -
xen/arch/x86/smpboot.c | 1 -
xen/arch/x86/sysctl.c | 5 +
xen/common/Kconfig | 3 +
xen/common/cpupool.c | 157 +++-
xen/common/domain.c | 35 +-
xen/common/domctl.c | 23 +-
xen/common/keyhandler.c | 58 +-
xen/common/sched_arinc653.c | 256 +++--
xen/common/sched_credit.c | 760 +++++++--------
xen/common/sched_credit2.c | 1119 +++++++++++-----------
xen/common/sched_null.c | 466 +++++-----
xen/common/sched_rt.c | 543 +++++------
xen/common/schedule.c | 1851 +++++++++++++++++++++++++++++--------
xen/common/softirq.c | 6 +-
xen/include/asm-arm/current.h | 1 +
xen/include/asm-x86/cpuidle.h | 11 -
xen/include/asm-x86/current.h | 19 +-
xen/include/asm-x86/dom0_build.h | 3 +-
xen/include/asm-x86/smp.h | 3 +
xen/include/xen/domain.h | 3 +-
xen/include/xen/perfc_defn.h | 32 +-
xen/include/xen/sched-if.h | 340 +++++--
xen/include/xen/sched.h | 93 +-
xen/include/xen/softirq.h | 1 +
37 files changed, 3675 insertions(+), 2197 deletions(-)
--
2.16.4
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