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SubjectRe: [PATCH for 4.16 00/11] membarrier updates for 4.16
Hi Ingo, Hi Peter,

Please let me know if you find anything that prevents you from integrating
this patchset into the scheduler tree.

Thanks,

Mathieu


----- On Jan 23, 2018, at 10:57 AM, Mathieu Desnoyers mathieu.desnoyers@efficios.com wrote:

> Hi Ingo, Peter, Thomas,
>
> Here is the updated membarrier patch series following review from
> Andy.
>
> It would be appreciated of those can go through the scheduler tree for
> the 4.16 merge window.
>
> Patch "x86: Implement sync_core_before_usermode" got a reviewed-by from
> Thomas, but I removed the tag following KPTI-related optimizations based
> on the discussion with Andy afterwards.
>
> Highlights:
>
> "powerpc: membarrier: Skip memory barrier in switch_mm()" takes care of
> a TODO that was left in the private expedited implementation when merged
> in 4.14: an extra memory barrier was added on context switch on powerpc.
> Ensure that the barrier is only performed when scheduling between
> different processes, only for threads belonging to processes that have
> registered their intent to use the private expedited command.
>
> "membarrier: provide GLOBAL_EXPEDITED command" adds new commands to
> membarrier for registration and use of membarrier across processes
> communicating through shared memory mappings. The non-expedited command
> has proven to be really too slow (taking 10ms and more to complete) for
> real-world use. The expedited version completes in a matter of
> microseconds. This patch renames the pre-existing MEMBARRIER_CMD_SHARED
> to MEMBARRIER_CMD_GLOBAL for consistency, keeping the old enum label
> as an alias for backward compatibility.
>
> "membarrier: Provide core serializing command" provides core
> serialization for JIT reclaim. We received positive feedback from
> Android developers that the proposed ABI fits their use-case.
> Only x86 32/64 and arm 64 implement this command so far. This is
> opt-in per architecture.
>
> The other patches add selftests and documentation.
>
> Thanks,
>
> Mathieu
>
> Mathieu Desnoyers (11):
> membarrier: selftest: Test private expedited cmd (v2)
> powerpc: membarrier: Skip memory barrier in switch_mm() (v7)
> membarrier: Document scheduler barrier requirements (v5)
> membarrier: provide GLOBAL_EXPEDITED command (v3)
> membarrier: selftest: Test global expedited cmd (v2)
> Introduce sync_core_before_usermode (v2)
> x86: Implement sync_core_before_usermode (v3)
> membarrier: Provide core serializing command (v2)
> membarrier: x86: Provide core serializing command (v4)
> membarrier: arm64: Provide core serializing command
> membarrier: selftest: Test private expedited sync core cmd
>
> MAINTAINERS | 1 +
> arch/arm64/Kconfig | 1 +
> arch/arm64/kernel/entry.S | 4 +
> arch/powerpc/Kconfig | 1 +
> arch/powerpc/include/asm/membarrier.h | 27 +++
> arch/powerpc/mm/mmu_context.c | 7 +
> arch/x86/Kconfig | 2 +
> arch/x86/entry/entry_32.S | 5 +
> arch/x86/entry/entry_64.S | 4 +
> arch/x86/include/asm/sync_core.h | 28 +++
> arch/x86/mm/tlb.c | 6 +
> include/linux/sched/mm.h | 40 +++-
> include/linux/sync_core.h | 21 ++
> include/uapi/linux/membarrier.h | 74 ++++++-
> init/Kconfig | 9 +
> kernel/sched/core.c | 53 +++--
> kernel/sched/membarrier.c | 177 +++++++++++++--
> .../testing/selftests/membarrier/membarrier_test.c | 237 +++++++++++++++++++--
> 18 files changed, 629 insertions(+), 68 deletions(-)
> create mode 100644 arch/powerpc/include/asm/membarrier.h
> create mode 100644 arch/x86/include/asm/sync_core.h
> create mode 100644 include/linux/sync_core.h
>
> --
> 2.11.0

--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

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