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    SubjectRe: [PATCH 0/2] sched/membarrier, selftests: Introduce MEMBARRIER_CMD_GET_REGISTRATIONS
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    On 2022-12-07 11:43, Michal Clapinski wrote:
    > This change provides a method to query previously issued registrations.
    > It's needed for CRIU (checkpoint/restore in userspace). Before this
    > change we had to issue private membarrier commands during checkpoint -
    > if they succeeded, they must have been registered. Unfortunately global
    > membarrier succeeds even on unregistered processes, so there was no way to
    > tell if MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED had been issued or not.
    >
    > CRIU is run after the process has been frozen with ptrace, so we don't
    > have to worry too much about the result of running this command in parallel
    > with registration commands.

    Peter, Paul, I'm OK with the proposed changes. Should we route this
    through sched/core from the tip tree ?

    For both patches:

    Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

    Thanks,

    Mathieu

    >
    > Michal Clapinski (2):
    > sched/membarrier: Introduce MEMBARRIER_CMD_GET_REGISTRATIONS
    > selftests/membarrier: Test MEMBARRIER_CMD_GET_REGISTRATIONS
    >
    > include/uapi/linux/membarrier.h | 4 ++
    > kernel/sched/membarrier.c | 39 ++++++++++++++++++-
    > .../membarrier/membarrier_test_impl.h | 33 ++++++++++++++++
    > .../membarrier/membarrier_test_multi_thread.c | 2 +-
    > .../membarrier_test_single_thread.c | 6 ++-
    > 5 files changed, 81 insertions(+), 3 deletions(-)
    >

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

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