From: "Eads, Gage" <gage.eads@intel.com>
To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
"'dev@dpdk.org'" <dev@dpdk.org>
Cc: "'olivier.matz@6wind.com'" <olivier.matz@6wind.com>,
"'arybchenko@solarflare.com'" <arybchenko@solarflare.com>,
"Richardson, Bruce" <bruce.richardson@intel.com>,
"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
"Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com>,
nd <nd@arm.com>, "thomas@monjalon.net" <thomas@monjalon.net>,
nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v3 6/8] stack: add C11 atomic implementation
Date: Mon, 1 Apr 2019 20:21:42 +0000 [thread overview]
Message-ID: <9184057F7FC11744A2107296B6B8EB1E5420E6E0@FMSMSX108.amr.corp.intel.com> (raw)
In-Reply-To: <VE1PR08MB51499D8D3DB5C866E29866C998550@VE1PR08MB5149.eurprd08.prod.outlook.com>
> -----Original Message-----
> From: Honnappa Nagarahalli [mailto:Honnappa.Nagarahalli@arm.com]
> Sent: Monday, April 1, 2019 2:07 PM
> To: Eads, Gage <gage.eads@intel.com>; 'dev@dpdk.org' <dev@dpdk.org>
> Cc: 'olivier.matz@6wind.com' <olivier.matz@6wind.com>;
> 'arybchenko@solarflare.com' <arybchenko@solarflare.com>; Richardson,
> Bruce <bruce.richardson@intel.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>; Gavin Hu (Arm Technology China)
> <Gavin.Hu@arm.com>; nd <nd@arm.com>; thomas@monjalon.net; nd
> <nd@arm.com>
> Subject: RE: [PATCH v3 6/8] stack: add C11 atomic implementation
>
> > > Subject: RE: [PATCH v3 6/8] stack: add C11 atomic implementation
> > >
> > > [snip]
> > >
> > > > > +static __rte_always_inline void __rte_stack_lf_push(struct
> > > > > +rte_stack_lf_list *list,
> > > > > + struct rte_stack_lf_elem *first,
> > > > > + struct rte_stack_lf_elem *last,
> > > > > + unsigned int num)
> > > > > +{
> > > > > +#ifndef RTE_ARCH_X86_64
> > > > > + RTE_SET_USED(first);
> > > > > + RTE_SET_USED(last);
> > > > > + RTE_SET_USED(list);
> > > > > + RTE_SET_USED(num);
> > > > > +#else
> > > > > + struct rte_stack_lf_head old_head;
> > > > > + int success;
> > > > > +
> > > > > + old_head = list->head;
> > > > This can be a torn read (same as you have mentioned in
> > > > __rte_stack_lf_pop). I suggest we use acquire thread fence here as
> > > > well (please see the comments in __rte_stack_lf_pop).
> > >
> > > Agreed. I'll add the acquire fence.
> > >
> >
> > On second thought, an acquire fence isn't necessary. The acquire fence
> > in
> > __rte_stack_lf_pop() ensures the list->head is ordered before the list
> > element reads. That isn't necessary here; we need to ensure that the
> > last->next write occurs (and is observed) before the list->head write,
> > which the CAS's RELEASE success memorder accomplishes.
> >
> > If a torn read occurs, the CAS will fail and will atomically re-load &old_head.
>
> Following is my understanding:
> The general guideline is there should be a load-acquire for every store-
> release. In both xxx_lf_pop and xxx_lf_push, the head is store-released,
> hence the load of the head should be load-acquire.
> From the code (for ex: in function _xxx_lf_push), you can notice that there is
> dependency from 'old_head to new_head to list->head(in
> compare_exchange)'. When such a dependency exists, if the memory
> orderings have to be avoided, one needs to use __ATOMIC_CONSUME.
> Currently, the compilers will use a stronger memory order (which is
> __ATOMIC_ACQUIRE) as __ATOMIC_CONSUME is not well defined. Please
> refer to [1] and [2] for more info.
>
> IMO, since, for 128b, we do not have a pure load-acquire, I suggest we use
> thread_fence with acquire semantics. It is a heavier barrier, but I think it is a
> safer code which will adhere to C11 memory model.
>
> [1] https://preshing.com/20140709/the-purpose-of-
> memory_order_consume-in-cpp11/
> [2] http://www.open-
> std.org/jtc1/sc22/wg21/docs/papers/2018/p0750r1.html
Thanks for those two links, they're good resources.
I agree with your understanding. I admit I'm not fully convinced the synchronized-with relationship is needed between pop's list->head store and push's list->head load (or between push's list->head store and its list->head load), but it's better to err on the side of caution to ensure it's functionally correct...at least until I can manage to convince you :).
I'll send out a V6 with the acquire thread fence.
Thanks,
Gage
next prev parent reply other threads:[~2019-04-01 20:21 UTC|newest]
Thread overview: 228+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-22 16:06 [dpdk-dev] [PATCH 0/7] Subject: [PATCH ...] Add stack library and new mempool handler Gage Eads
2019-02-22 16:06 ` [dpdk-dev] [PATCH 1/7] stack: introduce rte stack library Gage Eads
2019-02-25 10:43 ` Olivier Matz
2019-02-28 5:10 ` Eads, Gage
2019-02-22 16:06 ` [dpdk-dev] [PATCH 2/7] mempool/stack: convert mempool to use rte stack Gage Eads
2019-02-25 10:46 ` Olivier Matz
2019-02-22 16:06 ` [dpdk-dev] [PATCH 3/7] test/stack: add stack test Gage Eads
2019-02-25 10:59 ` Olivier Matz
2019-02-28 5:11 ` Eads, Gage
2019-02-22 16:06 ` [dpdk-dev] [PATCH 4/7] test/stack: add stack perf test Gage Eads
2019-02-25 11:04 ` Olivier Matz
2019-02-22 16:06 ` [dpdk-dev] [PATCH 5/7] stack: add non-blocking stack implementation Gage Eads
2019-02-25 11:28 ` Olivier Matz
[not found] ` <2EC44CCD3517A842B44C82651A5557A14AF13386@fmsmsx118.amr.corp.intel.com>
2019-03-01 20:53 ` [dpdk-dev] FW: " Eads, Gage
2019-03-01 21:12 ` Thomas Monjalon
2019-03-01 21:29 ` Eads, Gage
2019-02-22 16:06 ` [dpdk-dev] [PATCH 6/7] test/stack: add non-blocking stack tests Gage Eads
2019-02-25 11:28 ` Olivier Matz
2019-02-22 16:06 ` [dpdk-dev] [PATCH 7/7] mempool/stack: add non-blocking stack mempool handler Gage Eads
2019-02-25 11:29 ` Olivier Matz
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 0/8] Add stack library and new " Gage Eads
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 1/8] stack: introduce rte stack library Gage Eads
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 3/8] test/stack: add stack test Gage Eads
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 4/8] test/stack: add stack perf test Gage Eads
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 5/8] stack: add lock-free stack implementation Gage Eads
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 6/8] stack: add C11 atomic implementation Gage Eads
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 7/8] test/stack: add lock-free stack tests Gage Eads
2019-03-05 16:42 ` [dpdk-dev] [PATCH v2 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 0/8] Add stack library and new " Gage Eads
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 1/8] stack: introduce rte stack library Gage Eads
2019-03-14 8:00 ` Olivier Matz
2019-03-14 8:00 ` Olivier Matz
2019-03-28 23:26 ` Honnappa Nagarahalli
2019-03-28 23:26 ` Honnappa Nagarahalli
2019-03-29 19:23 ` Eads, Gage
2019-03-29 19:23 ` Eads, Gage
2019-03-29 21:07 ` Thomas Monjalon
2019-03-29 21:07 ` Thomas Monjalon
2019-04-01 17:41 ` Honnappa Nagarahalli
2019-04-01 17:41 ` Honnappa Nagarahalli
2019-04-01 19:34 ` Eads, Gage
2019-04-01 19:34 ` Eads, Gage
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 3/8] test/stack: add stack test Gage Eads
2019-03-14 8:00 ` Olivier Matz
2019-03-14 8:00 ` Olivier Matz
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 4/8] test/stack: add stack perf test Gage Eads
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 5/8] stack: add lock-free stack implementation Gage Eads
2019-03-14 8:01 ` Olivier Matz
2019-03-14 8:01 ` Olivier Matz
2019-03-28 23:27 ` Honnappa Nagarahalli
2019-03-28 23:27 ` Honnappa Nagarahalli
2019-03-29 19:25 ` Eads, Gage
2019-03-29 19:25 ` Eads, Gage
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 6/8] stack: add C11 atomic implementation Gage Eads
2019-03-14 8:04 ` Olivier Matz
2019-03-14 8:04 ` Olivier Matz
2019-03-28 23:27 ` Honnappa Nagarahalli
2019-03-28 23:27 ` Honnappa Nagarahalli
2019-03-29 19:24 ` Eads, Gage
2019-03-29 19:24 ` Eads, Gage
2019-04-01 0:06 ` Eads, Gage
2019-04-01 0:06 ` Eads, Gage
2019-04-01 19:06 ` Honnappa Nagarahalli
2019-04-01 19:06 ` Honnappa Nagarahalli
2019-04-01 20:21 ` Eads, Gage [this message]
2019-04-01 20:21 ` Eads, Gage
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 7/8] test/stack: add lock-free stack tests Gage Eads
2019-03-06 14:45 ` [dpdk-dev] [PATCH v3 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 0/8] Add stack library and new " Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 1/8] stack: introduce rte stack library Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 3/8] test/stack: add stack test Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 4/8] test/stack: add stack perf test Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 5/8] stack: add lock-free stack implementation Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 6/8] stack: add C11 atomic implementation Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 7/8] test/stack: add lock-free stack tests Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-03-28 18:00 ` [dpdk-dev] [PATCH v4 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-03-28 18:00 ` Gage Eads
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 0/8] Add stack library and new " Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 1/8] stack: introduce rte stack library Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 3/8] test/stack: add stack test Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 4/8] test/stack: add stack perf test Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 5/8] stack: add lock-free stack implementation Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 18:08 ` Honnappa Nagarahalli
2019-04-01 18:08 ` Honnappa Nagarahalli
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 6/8] stack: add C11 atomic implementation Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 7/8] test/stack: add lock-free stack tests Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 0:12 ` [dpdk-dev] [PATCH v5 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-04-01 0:12 ` Gage Eads
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 0/8] Add stack library and new " Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 1/8] stack: introduce rte stack library Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-02 11:14 ` Honnappa Nagarahalli
2019-04-02 11:14 ` Honnappa Nagarahalli
2019-04-03 17:06 ` Thomas Monjalon
2019-04-03 17:06 ` Thomas Monjalon
2019-04-03 17:13 ` Eads, Gage
2019-04-03 17:13 ` Eads, Gage
2019-04-03 17:23 ` Thomas Monjalon
2019-04-03 17:23 ` Thomas Monjalon
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 3/8] test/stack: add stack test Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 4/8] test/stack: add stack perf test Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 5/8] stack: add lock-free stack implementation Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 6/8] stack: add C11 atomic implementation Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-02 11:11 ` Honnappa Nagarahalli
2019-04-02 11:11 ` Honnappa Nagarahalli
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 7/8] test/stack: add lock-free stack tests Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-01 21:14 ` [dpdk-dev] [PATCH v6 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-04-01 21:14 ` Gage Eads
2019-04-03 17:04 ` [dpdk-dev] [PATCH v6 0/8] Add stack library and new " Thomas Monjalon
2019-04-03 17:04 ` Thomas Monjalon
2019-04-03 17:10 ` Eads, Gage
2019-04-03 17:10 ` Eads, Gage
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 " Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 1/8] stack: introduce rte stack library Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 3/8] test/stack: add stack test Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 4/8] test/stack: add stack perf test Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 5/8] stack: add lock-free stack implementation Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 6/8] stack: add C11 atomic implementation Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 7/8] test/stack: add lock-free stack tests Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:09 ` [dpdk-dev] [PATCH v7 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-04-03 20:09 ` Gage Eads
2019-04-03 20:39 ` [dpdk-dev] [PATCH v7 0/8] Add stack library and new " Thomas Monjalon
2019-04-03 20:39 ` Thomas Monjalon
2019-04-03 20:49 ` Eads, Gage
2019-04-03 20:49 ` Eads, Gage
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 " Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 1/8] stack: introduce rte stack library Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 3/8] test/stack: add stack test Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 22:41 ` Thomas Monjalon
2019-04-03 22:41 ` Thomas Monjalon
2019-04-03 23:05 ` Eads, Gage
2019-04-03 23:05 ` Eads, Gage
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 4/8] test/stack: add stack perf test Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 5/8] stack: add lock-free stack implementation Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 6/8] stack: add C11 atomic implementation Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 7/8] test/stack: add lock-free stack tests Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 20:50 ` [dpdk-dev] [PATCH v8 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-04-03 20:50 ` Gage Eads
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 0/8] Add stack library and new " Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 1/8] stack: introduce rte stack library Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-04 13:30 ` Thomas Monjalon
2019-04-04 13:30 ` Thomas Monjalon
2019-04-04 14:14 ` Eads, Gage
2019-04-04 14:14 ` Eads, Gage
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 3/8] test/stack: add stack test Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-04 7:34 ` Thomas Monjalon
2019-04-04 7:34 ` Thomas Monjalon
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 4/8] test/stack: add stack perf test Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 5/8] stack: add lock-free stack implementation Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 6/8] stack: add C11 atomic implementation Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 7/8] test/stack: add lock-free stack tests Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-03 23:20 ` [dpdk-dev] [PATCH v9 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-04-03 23:20 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 0/8] Add stack library and new " Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 1/8] stack: introduce rte stack library Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 2/8] mempool/stack: convert mempool to use rte stack Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 3/8] test/stack: add stack test Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 4/8] test/stack: add stack perf test Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 5/8] stack: add lock-free stack implementation Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 6/8] stack: add C11 atomic implementation Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 7/8] test/stack: add lock-free stack tests Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 10:01 ` [dpdk-dev] [PATCH v10 8/8] mempool/stack: add lock-free stack mempool handler Gage Eads
2019-04-04 10:01 ` Gage Eads
2019-04-04 15:42 ` [dpdk-dev] [PATCH v10 0/8] Add stack library and new " Thomas Monjalon
2019-04-04 15:42 ` Thomas Monjalon
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