Messages in this thread | | | Subject | Re: [RFC PATCH 0/2] Introduce serialized smp_call_function APIs | From | Avi Kivity <> | Date | Wed, 13 Mar 2024 23:58:44 +0200 |
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[resend in plain text for the list]
On Wed, 2024-03-13 at 16:56 -0400, Mathieu Desnoyers wrote: > 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. >
I see this doesn't restore scaling of MEMBARRIER_CMD_PRIVATE_EXPEDITED, which I use (and wasn't aware was broken).
I don't have comments on the patches, but do have ideas on how to work around the problem in Seastar. So this was a useful heads-up for me.
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