Messages in this thread | | | From | Mathieu Desnoyers <> | Subject | [RFC PATCH 0/2] Introduce serialized smp_call_function APIs | Date | Wed, 13 Mar 2024 16:56:20 -0400 |
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commit 944d5fe50f3f ("sched/membarrier: reduce the ability to hammer on sys_membarrier") introduces a mutex over all membarrier operations to reduce its ability to slow down the rest of the system.
This RFC series has two objectives:
1) Move this mutex to the smp_call_function APIs so other system calls using smp_call_function IPIs are limited in the same way,
2) Restore scalability of MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ with MEMBARRIER_CMD_FLAG_CPU, which targets specific CPUs with IPIs. This may or may not be useful, and I would welcome benchmarks from users of this feature to figure out if this is worth it.
This series applies on top of v6.8.
Thanks,
Mathieu
Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Andrew Hunter <ahh@google.com> Cc: Maged Michael <maged.michael@gmail.com> Cc: gromer@google.com Cc: Avi Kivity <avi@scylladb.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Peter Oskolkov <posk@google.com>
Mathieu Desnoyers (2): smp: Implement serialized smp_call_function APIs sched/membarrier: Use serialized smp_call_function APIs
include/linux/smp.h | 40 ++++++++++++++ kernel/sched/membarrier.c | 24 +++------ kernel/smp.c | 106 +++++++++++++++++++++++++++++++++----- 3 files changed, 141 insertions(+), 29 deletions(-)
-- 2.39.2
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