From: David Marchand <david.marchand@redhat.com>
To: Olivier Matz <olivier.matz@6wind.com>
Cc: dev@dpdk.org, Honnappa.Nagarahalli@arm.com, Ruifeng.Wang@arm.com,
thomas@monjalon.net, stephen@networkplumber.org,
mb@smartsharesystems.com,
Tyler Retzlaff <roretzla@linux.microsoft.com>
Subject: Re: [PATCH v3 2/7] stack: replace rte atomics with GCC builtin atomics
Date: Wed, 24 May 2023 22:08:22 +0200 [thread overview]
Message-ID: <CAJFAV8wqaWuFoJJ=CLKfooa4fZjWBF-2VPnUkvrmWrawy8eg9g@mail.gmail.com> (raw)
In-Reply-To: <1679612036-30773-3-git-send-email-roretzla@linux.microsoft.com>
Hello Olivier,
Review please.
On Thu, Mar 23, 2023 at 11:54 PM Tyler Retzlaff
<roretzla@linux.microsoft.com> wrote:
>
> Replace the use of rte_atomic.h types and functions, instead use GCC
> supplied C++11 memory model builtins.
>
> Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
> ---
> lib/stack/rte_stack_lf_generic.h | 16 +++++++++-------
> 1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/lib/stack/rte_stack_lf_generic.h b/lib/stack/rte_stack_lf_generic.h
> index 7fa29ce..aad3747 100644
> --- a/lib/stack/rte_stack_lf_generic.h
> +++ b/lib/stack/rte_stack_lf_generic.h
> @@ -26,8 +26,8 @@
> * elements. If the mempool is near-empty to the point that this is a
> * concern, the user should consider increasing the mempool size.
> */
> - return (unsigned int)rte_atomic64_read((rte_atomic64_t *)
> - &s->stack_lf.used.len);
> + /* NOTE: review for potential ordering optimization */
> + return __atomic_load_n(&s->stack_lf.used.len, __ATOMIC_SEQ_CST);
> }
>
> static __rte_always_inline void
> @@ -67,8 +67,8 @@
> 1, __ATOMIC_RELEASE,
> __ATOMIC_RELAXED);
> } while (success == 0);
> -
> - rte_atomic64_add((rte_atomic64_t *)&list->len, num);
> + /* NOTE: review for potential ordering optimization */
> + __atomic_fetch_add(&list->len, num, __ATOMIC_SEQ_CST);
> }
>
> static __rte_always_inline struct rte_stack_lf_elem *
> @@ -82,14 +82,16 @@
>
> /* Reserve num elements, if available */
> while (1) {
> - uint64_t len = rte_atomic64_read((rte_atomic64_t *)&list->len);
> + /* NOTE: review for potential ordering optimization */
> + uint64_t len = __atomic_load_n(&list->len, __ATOMIC_SEQ_CST);
>
> /* Does the list contain enough elements? */
> if (unlikely(len < num))
> return NULL;
>
> - if (rte_atomic64_cmpset((volatile uint64_t *)&list->len,
> - len, len - num))
> + /* NOTE: review for potential ordering optimization */
> + if (__atomic_compare_exchange_n(&list->len, &len, len - num,
> + 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST))
> break;
> }
>
> --
> 1.8.3.1
>
--
David Marchand
next prev parent reply other threads:[~2023-05-24 20:08 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-17 20:19 [PATCH 0/7] " Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 1/7] ring: " Tyler Retzlaff
2023-03-17 20:36 ` Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 2/7] stack: " Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 3/7] dma/idxd: " Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 4/7] net/ice: " Tyler Retzlaff
2023-03-17 20:41 ` Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 5/7] net/ixgbe: " Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 6/7] net/null: " Tyler Retzlaff
2023-03-17 20:44 ` Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 7/7] net/ring: " Tyler Retzlaff
2023-03-17 21:42 ` [PATCH 0/7] " Stephen Hemminger
2023-03-17 21:49 ` Tyler Retzlaff
2023-03-22 11:28 ` Morten Brørup
2023-03-22 14:21 ` Tyler Retzlaff
2023-03-22 14:58 ` Morten Brørup
2023-03-22 15:29 ` Tyler Retzlaff
2023-03-22 16:13 ` Morten Brørup
2023-03-22 16:40 ` Honnappa Nagarahalli
2023-03-22 17:07 ` Morten Brørup
2023-03-22 17:38 ` Honnappa Nagarahalli
2023-03-22 18:06 ` Tyler Retzlaff
2023-05-02 3:37 ` Tyler Retzlaff
2023-05-02 4:31 ` Honnappa Nagarahalli
2023-03-23 22:34 ` [PATCH v2 " Tyler Retzlaff
2023-03-23 22:34 ` [PATCH v2 1/7] ring: " Tyler Retzlaff
2023-03-23 22:34 ` [PATCH v2 2/7] stack: " Tyler Retzlaff
2023-03-23 22:34 ` [PATCH v2 3/7] dma/idxd: " Tyler Retzlaff
2023-03-23 22:34 ` [PATCH v2 4/7] net/ice: " Tyler Retzlaff
2023-03-23 22:34 ` [PATCH v2 5/7] net/ixgbe: " Tyler Retzlaff
2023-03-23 22:34 ` [PATCH v2 6/7] net/null: " Tyler Retzlaff
2023-03-23 22:34 ` [PATCH v2 7/7] net/ring: " Tyler Retzlaff
2023-03-24 7:07 ` [PATCH v2 0/7] " Morten Brørup
2023-03-23 22:53 ` [PATCH v3 " Tyler Retzlaff
2023-03-23 22:53 ` [PATCH v3 1/7] ring: " Tyler Retzlaff
2023-03-23 22:53 ` [PATCH v3 2/7] stack: " Tyler Retzlaff
2023-05-24 20:08 ` David Marchand [this message]
2023-03-23 22:53 ` [PATCH v3 3/7] dma/idxd: " Tyler Retzlaff
2023-05-24 20:09 ` David Marchand
2023-05-25 8:41 ` Bruce Richardson
2023-05-25 13:59 ` Morten Brørup
2023-05-25 12:57 ` Kevin Laatz
2023-03-23 22:53 ` [PATCH v3 4/7] net/ice: " Tyler Retzlaff
2023-05-24 20:10 ` David Marchand
2023-03-23 22:53 ` [PATCH v3 5/7] net/ixgbe: " Tyler Retzlaff
2023-05-24 20:11 ` David Marchand
2023-03-23 22:53 ` [PATCH v3 6/7] net/null: " Tyler Retzlaff
2023-05-24 20:13 ` David Marchand
2023-03-23 22:53 ` [PATCH v3 7/7] net/ring: " Tyler Retzlaff
2023-05-24 20:12 ` David Marchand
2023-05-25 8:44 ` Bruce Richardson
2023-03-24 7:09 ` [PATCH v3 0/7] " Morten Brørup
2023-03-24 19:22 ` Tyler Retzlaff
2023-05-24 12:40 ` David Marchand
2023-05-24 15:47 ` Tyler Retzlaff
2023-05-24 20:06 ` David Marchand
2023-05-24 22:50 ` Tyler Retzlaff
2023-05-24 22:56 ` Honnappa Nagarahalli
2023-05-25 0:02 ` Tyler Retzlaff
2023-05-25 7:50 ` Morten Brørup
2023-06-02 19:45 ` [PATCH v4 0/6] " Tyler Retzlaff
2023-06-02 19:45 ` [PATCH v4 1/6] stack: " Tyler Retzlaff
2023-06-02 19:45 ` [PATCH v4 2/6] dma/idxd: " Tyler Retzlaff
2023-06-02 19:45 ` [PATCH v4 3/6] net/ice: " Tyler Retzlaff
2023-06-02 19:45 ` [PATCH v4 4/6] net/ixgbe: " Tyler Retzlaff
2023-06-02 19:45 ` [PATCH v4 5/6] net/null: " Tyler Retzlaff
2023-06-02 19:45 ` [PATCH v4 6/6] net/ring: " Tyler Retzlaff
2023-06-05 8:27 ` Olivier Matz
2023-06-06 21:45 ` [PATCH v5 0/6] " Tyler Retzlaff
2023-06-06 21:45 ` [PATCH v5 1/6] stack: " Tyler Retzlaff
2023-06-06 21:45 ` [PATCH v5 2/6] dma/idxd: " Tyler Retzlaff
2023-06-06 21:45 ` [PATCH v5 3/6] net/ice: " Tyler Retzlaff
2023-06-06 21:45 ` [PATCH v5 4/6] net/ixgbe: " Tyler Retzlaff
2023-06-06 21:45 ` [PATCH v5 5/6] net/null: " Tyler Retzlaff
2023-06-06 21:45 ` [PATCH v5 6/6] net/ring: " Tyler Retzlaff
2023-06-09 15:01 ` [PATCH v5 0/6] " David Marchand
2023-06-09 15:13 ` Tyler Retzlaff
2023-06-22 19:59 ` Patrick Robb
2023-06-23 8:53 ` David Marchand
2023-06-23 21:37 ` Tyler Retzlaff
2023-06-28 14:01 ` Patrick Robb
2023-06-28 14:49 ` David Marchand
2023-06-23 21:35 ` Tyler Retzlaff
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