v5: https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02979.html
For context, the goal of this series is to substitute the BQL for the
per-CPU locks in many places, notably the execution loop in cpus.c.
This leads to better scalability for MTTCG, since CPUs don't have
to acquire a contended global lock (the BQL) every time they
stop executing code.
See the last commit for some performance numbers.
After this series, the remaining obstacles to achieving KVM-like
scalability in MTTCG are: (1) interrupt handling, which
in some targets requires the BQL, and (2) frequent execution of
"async safe" work.
That said, some targets scale great on MTTCG even before this
series -- for instance, when running a parallel compilation job
in an x86_64 guest, scalability is comparable to what we get with
KVM.
This series is very long. If you only have time to look at a few patches,
I suggest the following, which do most of the heavy lifting and
have not yet been reviewed:
- Patch 7: cpu: make per-CPU locks an alias of the BQL in TCG rr mode
- Patch 70: cpu: protect CPU state with cpu->lock instead of the BQL
I've tested all patches with `make check-qtest -j' for all targets.
The series is checkpatch-clean (just some warnings about __COVERITY__).
You can fetch the series from:
https://github.com/cota/qemu/tree/cpu-lock-v6
---
Changes since v5:
- Rebase on current master
+ Fixed a few conflicts, and converted the references to cpu->halted and
cpu->interrupt_request that had been added since v5.
- Add R-b's and Ack's -- thanks everyone!
Thanks,
Emilio
---
accel/tcg/cpu-exec.c | 40 ++--
accel/tcg/cputlb.c | 10 +-
accel/tcg/tcg-all.c | 12 +-
accel/tcg/tcg-runtime.c | 7 +
accel/tcg/tcg-runtime.h | 2 +
accel/tcg/translate-all.c | 2 +-
cpus-common.c | 129 ++++++++----
cpus.c | 421 ++++++++++++++++++++++++++++++++--------
exec.c | 2 +-
gdbstub.c | 4 +-
hw/arm/omap1.c | 4 +-
hw/arm/pxa2xx_gpio.c | 2 +-
hw/arm/pxa2xx_pic.c | 2 +-
hw/intc/s390_flic.c | 4 +-
hw/mips/cps.c | 2 +-
hw/misc/mips_itu.c | 4 +-
hw/openrisc/cputimer.c | 2 +-
hw/ppc/e500.c | 4 +-
hw/ppc/ppc.c | 12 +-
hw/ppc/ppce500_spin.c | 6 +-
hw/ppc/spapr_cpu_core.c | 4 +-
hw/ppc/spapr_hcall.c | 4 +-
hw/ppc/spapr_rtas.c | 6 +-
hw/sparc/leon3.c | 2 +-
hw/sparc/sun4m.c | 8 +-
hw/sparc64/sparc64.c | 8 +-
include/qom/cpu.h | 189 +++++++++++++++---
qom/cpu.c | 27 ++-
stubs/Makefile.objs | 1 +
stubs/cpu-lock.c | 28 +++
target/alpha/cpu.c | 8 +-
target/alpha/translate.c | 6 +-
target/arm/arm-powerctl.c | 4 +-
target/arm/cpu.c | 8 +-
target/arm/helper.c | 16 +-
target/arm/machine.c | 2 +-
target/arm/op_helper.c | 2 +-
target/cris/cpu.c | 2 +-
target/cris/helper.c | 6 +-
target/cris/translate.c | 5 +-
target/hppa/cpu.c | 2 +-
target/hppa/translate.c | 3 +-
target/i386/cpu.c | 4 +-
target/i386/cpu.h | 2 +-
target/i386/hax-all.c | 36 ++--
target/i386/helper.c | 8 +-
target/i386/hvf/hvf.c | 16 +-
target/i386/hvf/x86hvf.c | 38 ++--
target/i386/kvm.c | 78 ++++----
target/i386/misc_helper.c | 2 +-
target/i386/seg_helper.c | 13 +-
target/i386/svm_helper.c | 6 +-
target/i386/whpx-all.c | 57 +++---
target/lm32/cpu.c | 2 +-
target/lm32/op_helper.c | 4 +-
target/m68k/cpu.c | 2 +-
target/m68k/op_helper.c | 2 +-
target/m68k/translate.c | 9 +-
target/microblaze/cpu.c | 2 +-
target/microblaze/translate.c | 4 +-
target/mips/cpu.c | 11 +-
target/mips/kvm.c | 4 +-
target/mips/op_helper.c | 8 +-
target/mips/translate.c | 4 +-
target/moxie/cpu.c | 2 +-
target/nios2/cpu.c | 2 +-
target/openrisc/cpu.c | 4 +-
target/openrisc/sys_helper.c | 4 +-
target/ppc/excp_helper.c | 8 +-
target/ppc/helper_regs.h | 2 +-
target/ppc/kvm.c | 8 +-
target/ppc/translate.c | 6 +-
target/ppc/translate_init.inc.c | 36 ++--
target/riscv/cpu.c | 5 +-
target/riscv/op_helper.c | 2 +-
target/s390x/cpu.c | 28 ++-
target/s390x/excp_helper.c | 4 +-
target/s390x/kvm.c | 2 +-
target/s390x/sigp.c | 8 +-
target/sh4/cpu.c | 2 +-
target/sh4/helper.c | 2 +-
target/sh4/op_helper.c | 2 +-
target/sparc/cpu.c | 6 +-
target/sparc/helper.c | 2 +-
target/unicore32/cpu.c | 2 +-
target/unicore32/softmmu.c | 2 +-
target/xtensa/cpu.c | 6 +-
target/xtensa/exc_helper.c | 2 +-
target/xtensa/helper.c | 2 +-
89 files changed, 1018 insertions(+), 455 deletions(-)