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Date: Wed, 21 Sep 2022 15:54:18 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
"Paul E . McKenney" <paulmck@...nel.org>,
Boqun Feng <boqun.feng@...il.com>,
"H . Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
linux-api@...r.kernel.org, Christian Brauner <brauner@...nel.org>,
Florian Weimer <fw@...eb.enyo.de>, David.Laight@...LAB.COM,
carlos@...hat.com, Peter Oskolkov <posk@...k.io>,
Alexander Mikhalitsyn <alexander@...alicyn.com>
Subject: Re: [RFC PATCH v4 00/25] RSEQ node id and virtual cpu id extensions
On 2022-09-21 15:24, Mathieu Desnoyers wrote:
> Extend the rseq ABI to expose a NUMA node ID and a vm_vcpu_id field.
>
> The NUMA node ID field allows implementing a faster getcpu(2) in libc.
>
> The virtual cpu id allows ideal scaling (down or up) of user-space
> per-cpu data structures. The virtual cpu ids allocated within a memory
> space are tracked by the scheduler, which takes into account the number
> of concurrently running threads, thus implicitly considering the number
> of threads, the cpu affinity, the cpusets applying to those threads, and
> the number of logical cores on the system.
>
> This series is based on the v5.19 tag.
Hi Peter,
I'm having MTA issues at the moment. I will resend the series as soon as
I can get hold of my sysadmin.
Sorry about that.
Thanks,
Mathieu
>
> Thanks,
>
> Mathieu
>
> Mathieu Desnoyers (25):
> rseq: Introduce feature size and alignment ELF auxiliary vector
> entries
> rseq: Introduce extensible rseq ABI
> rseq: Extend struct rseq with numa node id
> selftests/rseq: Use ELF auxiliary vector for extensible rseq
> selftests/rseq: Implement rseq numa node id field selftest
> lib: Invert _find_next_bit source arguments
> lib: Implement find_{first,next}_{zero,one}_and_zero_bit
> cpumask: Implement cpumask_{first,next}_{zero,one}_and_zero
> sched: Introduce per memory space current virtual cpu id
> rseq: Extend struct rseq with per memory space vcpu id
> selftests/rseq: Remove RSEQ_SKIP_FASTPATH code
> selftests/rseq: Implement rseq vm_vcpu_id field support
> selftests/rseq: x86: Template memory ordering and percpu access mode
> selftests/rseq: arm: Template memory ordering and percpu access mode
> selftests/rseq: arm64: Template memory ordering and percpu access mode
> selftests/rseq: mips: Template memory ordering and percpu access mode
> selftests/rseq: ppc: Template memory ordering and percpu access mode
> selftests/rseq: s390: Template memory ordering and percpu access mode
> selftests/rseq: riscv: Template memory ordering and percpu access mode
> selftests/rseq: Implement basic percpu ops vm_vcpu_id test
> selftests/rseq: Implement parametrized vm_vcpu_id test
> selftests/rseq: x86: Implement rseq_load_u32_u32
> selftests/rseq: Implement numa node id vs vm_vcpu_id invariant test
> selftests/rseq: parametrized test: Report/abort on negative cpu id
> tracing/rseq: Add mm_vcpu_id field to rseq_update
>
> fs/binfmt_elf.c | 5 +
> fs/exec.c | 6 +
> include/linux/cpumask.h | 86 ++
> include/linux/find.h | 123 +-
> include/linux/mm.h | 25 +
> include/linux/mm_types.h | 110 +-
> include/linux/sched.h | 9 +
> include/trace/events/rseq.h | 7 +-
> include/uapi/linux/auxvec.h | 2 +
> include/uapi/linux/rseq.h | 22 +
> init/Kconfig | 4 +
> kernel/fork.c | 11 +-
> kernel/ptrace.c | 2 +-
> kernel/rseq.c | 61 +-
> kernel/sched/core.c | 49 +
> kernel/sched/sched.h | 166 +++
> kernel/signal.c | 2 +
> lib/find_bit.c | 17 +-
> tools/include/linux/find.h | 9 +-
> tools/lib/find_bit.c | 17 +-
> tools/testing/selftests/rseq/.gitignore | 5 +
> tools/testing/selftests/rseq/Makefile | 20 +-
> .../testing/selftests/rseq/basic_numa_test.c | 117 ++
> .../selftests/rseq/basic_percpu_ops_test.c | 46 +-
> tools/testing/selftests/rseq/basic_test.c | 4 +
> tools/testing/selftests/rseq/compiler.h | 6 +
> tools/testing/selftests/rseq/param_test.c | 157 ++-
> tools/testing/selftests/rseq/rseq-abi.h | 22 +
> tools/testing/selftests/rseq/rseq-arm-bits.h | 505 +++++++
> tools/testing/selftests/rseq/rseq-arm.h | 701 +---------
> .../testing/selftests/rseq/rseq-arm64-bits.h | 392 ++++++
> tools/testing/selftests/rseq/rseq-arm64.h | 520 +------
> .../testing/selftests/rseq/rseq-bits-reset.h | 10 +
> .../selftests/rseq/rseq-bits-template.h | 39 +
> tools/testing/selftests/rseq/rseq-mips-bits.h | 462 +++++++
> tools/testing/selftests/rseq/rseq-mips.h | 646 +--------
> tools/testing/selftests/rseq/rseq-ppc-bits.h | 454 +++++++
> tools/testing/selftests/rseq/rseq-ppc.h | 617 +--------
> .../testing/selftests/rseq/rseq-riscv-bits.h | 410 ++++++
> tools/testing/selftests/rseq/rseq-riscv.h | 529 +-------
> tools/testing/selftests/rseq/rseq-s390-bits.h | 474 +++++++
> tools/testing/selftests/rseq/rseq-s390.h | 495 +------
> tools/testing/selftests/rseq/rseq-skip.h | 65 -
> tools/testing/selftests/rseq/rseq-x86-bits.h | 1036 ++++++++++++++
> tools/testing/selftests/rseq/rseq-x86.h | 1193 +----------------
> tools/testing/selftests/rseq/rseq.c | 86 +-
> tools/testing/selftests/rseq/rseq.h | 229 +++-
> .../testing/selftests/rseq/run_param_test.sh | 5 +
> 48 files changed, 5286 insertions(+), 4692 deletions(-)
> create mode 100644 tools/testing/selftests/rseq/basic_numa_test.c
> create mode 100644 tools/testing/selftests/rseq/rseq-arm-bits.h
> create mode 100644 tools/testing/selftests/rseq/rseq-arm64-bits.h
> create mode 100644 tools/testing/selftests/rseq/rseq-bits-reset.h
> create mode 100644 tools/testing/selftests/rseq/rseq-bits-template.h
> create mode 100644 tools/testing/selftests/rseq/rseq-mips-bits.h
> create mode 100644 tools/testing/selftests/rseq/rseq-ppc-bits.h
> create mode 100644 tools/testing/selftests/rseq/rseq-riscv-bits.h
> create mode 100644 tools/testing/selftests/rseq/rseq-s390-bits.h
> delete mode 100644 tools/testing/selftests/rseq/rseq-skip.h
> create mode 100644 tools/testing/selftests/rseq/rseq-x86-bits.h
>
--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com
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