V7: https://lists.gnu.org/archive/html/qemu-devel/2019-03/msg00786.html
This is a continuation of the series created by Emilio Cota. We are picking up this patch set with the goal to apply any fixes or updates needed to get this accepted. Quoting an earlier patch in the series: "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." Listed below are the changes for this version of the patch, aside from the merge related changes. Changes for V8: - Fixed issue where in rr mode we could destroy the BQL twice. Added new function cpu_mutex_destroy(). - Removed g_assert(qemu_mutex_iothread_locked()) from qemu_tcg_rr_all_cpu_threads_idle(). There is an existing case where we call qemu_tcg_rr_all_cpu_threads_idle() without the BQL held, so we cannot assert on the lock here. - Found/fixed bug that had been hit in testing previously during the last consideration of this patch. We reproduced the issue hit in the qtest: bios-tables-test. The issue was introduced by dropping the BQL, and found us (very rarely) missing the condition variable wakeup in qemu_tcg_rr_cpu_thread_fn(). - ppc: convert to cpu_halted - Converted new code for cpu_halted and cpu_halted_set. - hw/semihosting: convert to cpu_halted_set - Added this patch as this code was new and needed converting. - ppc/translate_init.inc.c - Translated some new code here to use cpu_has_work_with_iothread_lock. - ppc/sapr_hcall.c Translated new code to cpu_halted - i386/hax-all.c - converted new code to cpu_interrupt_request and cpu_halted - mips/kvm.c - converted new code to cpu_halted - Some changes were related to files that moved, cpu.c and cpu.h moved to hw/core/, and some changes needed to be put there manually during the merge. Emilio G. Cota (69): cpu: convert queued work to a QSIMPLEQ cpu: rename cpu->work_mutex to cpu->lock cpu: introduce cpu_mutex_lock/unlock cpu: make qemu_work_cond per-cpu cpu: move run_on_cpu to cpus-common cpu: introduce process_queued_cpu_work_locked cpu: make per-CPU locks an alias of the BQL in TCG rr mode tcg-runtime: define helper_cpu_halted_set ppc: convert to helper_cpu_halted_set cris: convert to helper_cpu_halted_set hppa: convert to helper_cpu_halted_set m68k: convert to helper_cpu_halted_set alpha: convert to helper_cpu_halted_set microblaze: convert to helper_cpu_halted_set cpu: define cpu_halted helpers tcg-runtime: convert to cpu_halted_set arm: convert to cpu_halted ppc: convert to cpu_halted sh4: convert to cpu_halted i386: convert to cpu_halted lm32: convert to cpu_halted m68k: convert to cpu_halted mips: convert to cpu_halted riscv: convert to cpu_halted s390x: convert to cpu_halted sparc: convert to cpu_halted xtensa: convert to cpu_halted gdbstub: convert to cpu_halted openrisc: convert to cpu_halted cpu-exec: convert to cpu_halted cpu: convert to cpu_halted cpu: define cpu_interrupt_request helpers exec: use cpu_reset_interrupt arm: convert to cpu_interrupt_request i386: convert to cpu_interrupt_request i386/kvm: convert to cpu_interrupt_request i386/hax-all: convert to cpu_interrupt_request i386/whpx-all: convert to cpu_interrupt_request i386/hvf: convert to cpu_request_interrupt ppc: convert to cpu_interrupt_request sh4: convert to cpu_interrupt_request cris: convert to cpu_interrupt_request hppa: convert to cpu_interrupt_request lm32: convert to cpu_interrupt_request m68k: convert to cpu_interrupt_request mips: convert to cpu_interrupt_request nios: convert to cpu_interrupt_request s390x: convert to cpu_interrupt_request alpha: convert to cpu_interrupt_request moxie: convert to cpu_interrupt_request sparc: convert to cpu_interrupt_request openrisc: convert to cpu_interrupt_request unicore32: convert to cpu_interrupt_request microblaze: convert to cpu_interrupt_request accel/tcg: convert to cpu_interrupt_request cpu: convert to interrupt_request cpu: call .cpu_has_work with the CPU lock held cpu: introduce cpu_has_work_with_iothread_lock ppc: convert to cpu_has_work_with_iothread_lock mips: convert to cpu_has_work_with_iothread_lock s390x: convert to cpu_has_work_with_iothread_lock riscv: convert to cpu_has_work_with_iothread_lock sparc: convert to cpu_has_work_with_iothread_lock xtensa: convert to cpu_has_work_with_iothread_lock cpu: rename all_cpu_threads_idle to qemu_tcg_rr_all_cpu_threads_idle cpu: protect CPU state with cpu->lock instead of the BQL cpus-common: release BQL earlier in run_on_cpu cpu: add async_run_on_cpu_no_bql cputlb: queue async flush jobs without the BQL Paolo Bonzini (4): ppc: use cpu_reset_interrupt i386: use cpu_reset_interrupt s390x: use cpu_reset_interrupt openrisc: use cpu_reset_interrupt Robert Foley (1): hw/semihosting: convert to cpu_halted_set 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 | 438 ++++++++++++++++++++++++++------ exec.c | 2 +- gdbstub.c | 4 +- hw/arm/omap1.c | 4 +- hw/arm/pxa2xx_gpio.c | 2 +- hw/arm/pxa2xx_pic.c | 2 +- hw/core/cpu.c | 29 +-- hw/core/machine-qmp-cmds.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 | 14 +- hw/ppc/spapr_rtas.c | 8 +- hw/semihosting/console.c | 4 +- hw/sparc/leon3.c | 2 +- hw/sparc/sun4m.c | 8 +- hw/sparc64/sparc64.c | 8 +- include/hw/core/cpu.h | 197 ++++++++++++-- stubs/Makefile.objs | 1 + stubs/cpu-lock.c | 35 +++ target/alpha/cpu.c | 8 +- target/alpha/translate.c | 6 +- target/arm/arm-powerctl.c | 6 +- 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 | 4 +- 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 | 42 +-- target/i386/helper.c | 8 +- target/i386/hvf/hvf.c | 12 +- target/i386/hvf/x86hvf.c | 37 +-- target/i386/kvm.c | 82 +++--- 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/cp0_helper.c | 6 +- target/mips/cpu.c | 11 +- target/mips/kvm.c | 4 +- target/mips/op_helper.c | 2 +- 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 | 6 +- target/ppc/helper_regs.h | 2 +- target/ppc/kvm.c | 6 +- target/ppc/translate.c | 6 +- target/ppc/translate_init.inc.c | 41 +-- 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 +- 92 files changed, 1067 insertions(+), 464 deletions(-) create mode 100644 stubs/cpu-lock.c -- 2.17.1