From: "Mattias Rönnblom" <hofors@lysator.liu.se>
To: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>,
Chengwen Feng <fengchengwen@huawei.com>
Cc: david.marchand@redhat.com, mb@smartsharesystems.com,
anatoly.burakov@intel.com, jerinjacobk@gmail.com,
thomas@monjalon.net, dev@dpdk.org
Subject: Re: [PATCH v8 7/9] memarea: support backup memory mechanism
Date: Tue, 11 Oct 2022 22:26:10 +0200 [thread overview]
Message-ID: <4a8e9496-17ac-d58a-9744-00630c4b7412@lysator.liu.se> (raw)
In-Reply-To: <20221011185832.4aaffcc5@sovereign>
On 2022-10-11 17:58, Dmitry Kozlyuk wrote:
> 2022-10-11 12:17 (UTC+0000), Chengwen Feng:
>> This patch adds a memarea backup mechanism, where an allocation request
>> which cannot be met by the current memarea is deferred to its backup
>> memarea.
>
> This is a controversial feature.
>
> 1. It violates memarea property of freeing all allocated objects
> at once when the memarea itself is destroyed. Objects allocated
> in the backup memarea through the destroyed one will remain.
>
> 2. If there was an API to check that the object belongs to a memarea
> (the check from rte_memarea_update_refcnt() in this patch),
> it would be trivial to implement this feature on top of memarea API.
>
> Nit: "Deferred" is about time -> "forwarded", "delegated", or "handled over".
>
> A general note about this series.
> IMO, libraries should have limited scope and allow composition
> rather than accumulate features and control their use via options.
> The core idea of memarea is an allocator within a memory region,
> a fast one and with low overhead, usable to free all objects at once.
>
What's a typical use case for a memory region? In a packet processing
context.
The ability to instantiate a variable number of heaps/regions seems
useful, although it's not clear to me if the application should order
that to happen on a per-lcore basis, on a per-NUMA node basis, a
per-<some domain object>-basis, or something else entirely.
It seems to me that DPDK is lacking a variable-size memory allocator
which is efficient and safe to use from lcore threads. My impression is
that glibc malloc() and rte_malloc() are too slow for the packet
processing threads, and involves code paths taking locks shared with
non-EAL threads.
> This is orthogonal to the question from where the memory comes from.
> HEAP and LIBC sources could be built on top of USER source,
> which means that the concept of source is less relevant.
> Backup mechanism could instead be a way to add memory to the area,
> in which case HEAP and LIBC memarea would also be expandable.
> Memarea API could be defined as a structure with callbacks,
> and different types of memarea could be combined,
> for example, interlocked memarea on top of expandable memarea on top of
> memarea with a particular memory management algorithm.
>
> I'm not saying we should immediately build all this complexity.
The part with implementing runtime polymorphism using a struct with
function pointers, instead of the enum+switch-based-type-test approach,
doesn't sound like something that would add complexity. Rather the opposite.
Also, having a clear-cut separation of concern between
the-thing-that-allocates-and-frees-the-region and the region-internal
memory manager (what's called an algorithm in this patchset) also seems
like something that would simplify the code.
> On the contrary, I would merge the basic things first,
> then try to _stack_ new features on top,
> then look if interfaces emerge that can be used for composition.
next prev parent reply other threads:[~2022-10-11 20:26 UTC|newest]
Thread overview: 222+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-21 4:46 [RFC] memarea: introduce memory area library Chengwen Feng
2022-07-21 15:22 ` Stephen Hemminger
2022-08-04 6:36 ` Jerin Jacob
2022-08-30 12:41 ` Dmitry Kozlyuk
2022-09-20 3:46 ` [PATCH 0/8] introduce memarea library Chengwen Feng
2022-09-20 3:46 ` [PATCH 1/8] memarea: introduce memory area library Chengwen Feng
2022-09-20 11:30 ` Dmitry Kozlyuk
2022-09-20 11:31 ` Dmitry Kozlyuk
2022-09-20 12:06 ` fengchengwen
2022-09-20 3:46 ` [PATCH 2/8] test/memarea: support memarea test Chengwen Feng
2022-09-20 3:46 ` [PATCH 3/8] memarea: support alloc/free/update-refcnt API Chengwen Feng
2022-09-20 3:46 ` [PATCH 4/8] test/memarea: support alloc/free/update-refcnt test Chengwen Feng
2022-09-20 3:46 ` [PATCH 5/8] memarea: support dump API Chengwen Feng
2022-09-20 3:46 ` [PATCH 6/8] test/memarea: support dump test Chengwen Feng
2022-09-20 3:46 ` [PATCH 7/8] memarea: support backup memory mechanism Chengwen Feng
2022-09-20 3:46 ` [PATCH 8/8] test/memarea: support backup memory test Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 0/9] introduce memarea library Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 1/9] memarea: introduce memory area library Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 2/9] test/memarea: support memarea test Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 3/9] memarea: support alloc/free/update-refcnt API Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 4/9] test/memarea: support alloc/free/update-refcnt test Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 5/9] memarea: support dump API Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 6/9] test/memarea: support dump test Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 7/9] memarea: support backup memory mechanism Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 8/9] test/memarea: support backup memory test Chengwen Feng
2022-09-21 3:12 ` [PATCH v2 9/9] test/memarea: support no MT-safe test Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 00/10] introduce memarea library Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 01/10] memarea: " Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 02/10] test/memarea: support memarea test Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 03/10] memarea: support alloc/free/update-refcnt API Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 04/10] test/memarea: support alloc/free/update-refcnt test Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 05/10] memarea: support dump API Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 06/10] test/memarea: support dump test Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 07/10] memarea: support backup memory mechanism Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 08/10] test/memarea: support backup memory test Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 09/10] memarea: detect memory corruption based on magic Chengwen Feng
2022-09-24 7:49 ` [PATCH v3 10/10] test/memarea: support no MT-safe test Chengwen Feng
2022-10-03 7:42 ` [PATCH v3 00/10] introduce memarea library David Marchand
2022-10-05 4:19 ` datshan
2022-10-05 3:38 ` [PATCH v4 " datshan
[not found] ` <20221005033848.2241-1-datshan@qq.com>
2022-10-05 3:38 ` [PATCH v4 01/10] memarea: " datshan
2022-10-05 3:38 ` [PATCH v4 02/10] test/memarea: support memarea test datshan
2022-10-05 3:38 ` [PATCH v4 03/10] memarea: support alloc/free/update-refcnt API datshan
2022-10-05 3:38 ` [PATCH v4 04/10] test/memarea: support alloc/free/update-refcnt test datshan
2022-10-05 3:38 ` [PATCH v4 05/10] memarea: support dump API datshan
2022-10-05 3:38 ` [PATCH v4 06/10] test/memarea: support dump test datshan
2022-10-05 3:38 ` [PATCH v4 07/10] memarea: support backup memory mechanism datshan
2022-10-05 3:38 ` [PATCH v4 08/10] test/memarea: support backup memory test datshan
2022-10-05 3:38 ` [PATCH v4 09/10] memarea: detect memory corruption based on magic datshan
2022-10-05 3:38 ` [PATCH v4 10/10] test/memarea: support no MT-safe test datshan
2022-10-05 4:09 ` [PATCH v5 00/10] introduce memarea library datshan
[not found] ` <20221005040952.8166-1-datshan@qq.com>
2022-10-05 4:09 ` [PATCH v5 01/10] memarea: " datshan
2022-10-06 20:15 ` Mattias Rönnblom
2022-10-08 7:53 ` fengchengwen
2022-10-10 16:53 ` Mattias Rönnblom
2022-10-10 23:33 ` fengchengwen
2022-10-11 15:35 ` Mattias Rönnblom
2022-10-05 4:09 ` [PATCH v5 02/10] test/memarea: support memarea test datshan
2022-10-05 4:09 ` [PATCH v5 03/10] memarea: support alloc/free/update-refcnt API datshan
2022-10-06 19:43 ` Mattias Rönnblom
2022-10-08 8:02 ` fengchengwen
2022-10-05 4:09 ` [PATCH v5 04/10] test/memarea: support alloc/free/update-refcnt test datshan
2022-10-05 4:09 ` [PATCH v5 05/10] memarea: support dump API datshan
2022-10-05 4:09 ` [PATCH v5 06/10] test/memarea: support dump test datshan
2022-10-05 4:09 ` [PATCH v5 07/10] memarea: support backup memory mechanism datshan
2022-10-06 19:53 ` Mattias Rönnblom
2022-10-08 7:56 ` fengchengwen
2022-10-05 4:09 ` [PATCH v5 08/10] test/memarea: support backup memory test datshan
2022-10-05 4:09 ` [PATCH v5 09/10] memarea: detect memory corruption based on magic datshan
2022-10-05 4:09 ` [PATCH v5 10/10] test/memarea: support no MT-safe test datshan
2022-10-08 11:33 ` [PATCH v6 00/10] introduce memarea library Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 01/10] memarea: " Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 02/10] test/memarea: support memarea test Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 03/10] memarea: support alloc/free/update-refcnt API Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 04/10] test/memarea: support alloc/free/update-refcnt test Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 05/10] memarea: support dump API Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 06/10] test/memarea: support dump test Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 07/10] memarea: support backup memory mechanism Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 08/10] test/memarea: support backup memory test Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 09/10] memarea: detect memory corruption based on magic Chengwen Feng
2022-10-08 11:33 ` [PATCH v6 10/10] test/memarea: support no MT-safe test Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 00/10] introduce memarea library Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 01/10] memarea: " Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 02/10] test/memarea: support memarea test Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 03/10] memarea: support alloc/free/update-refcnt API Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 04/10] test/memarea: support alloc/free/update-refcnt test Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 05/10] memarea: support dump API Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 06/10] test/memarea: support dump test Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 07/10] memarea: support backup memory mechanism Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 08/10] test/memarea: support backup memory test Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 09/10] memarea: detect memory corruption based on magic Chengwen Feng
2022-10-08 11:58 ` [PATCH v7 10/10] test/memarea: support no MT-safe test Chengwen Feng
2022-10-08 12:14 ` [PATCH v7 00/10] introduce memarea library fengchengwen
2022-10-11 12:17 ` [PATCH v8 0/9] " Chengwen Feng
2022-10-11 12:17 ` [PATCH v8 1/9] memarea: " Chengwen Feng
2022-10-11 15:58 ` Dmitry Kozlyuk
2022-10-12 4:06 ` fengchengwen
2022-10-13 10:45 ` fengchengwen
2022-10-11 12:17 ` [PATCH v8 2/9] test/memarea: support memarea test Chengwen Feng
2022-10-11 12:17 ` [PATCH v8 3/9] memarea: support alloc/free/update-refcnt API Chengwen Feng
2022-10-11 15:58 ` Dmitry Kozlyuk
2022-10-12 7:28 ` fengchengwen
2022-10-11 12:17 ` [PATCH v8 4/9] test/memarea: support alloc/free/update-refcnt test Chengwen Feng
2022-10-11 12:17 ` [PATCH v8 5/9] memarea: support dump API Chengwen Feng
2022-10-11 12:17 ` [PATCH v8 6/9] test/memarea: support dump test Chengwen Feng
2022-10-11 12:17 ` [PATCH v8 7/9] memarea: support backup memory mechanism Chengwen Feng
2022-10-11 15:58 ` Dmitry Kozlyuk
2022-10-11 20:26 ` Mattias Rönnblom [this message]
2022-10-12 8:23 ` fengchengwen
2022-10-12 7:57 ` fengchengwen
2022-10-11 12:17 ` [PATCH v8 8/9] test/memarea: support backup memory test Chengwen Feng
2022-10-11 12:17 ` [PATCH v8 9/9] app/test: add memarea to malloc-perf-autotest Chengwen Feng
2022-10-11 15:58 ` Dmitry Kozlyuk
2022-10-12 8:03 ` fengchengwen
2022-10-12 10:47 ` [PATCH v9 0/7] introduce memarea library Chengwen Feng
2022-10-12 10:47 ` [PATCH v9 1/7] memarea: " Chengwen Feng
2022-10-12 10:48 ` [PATCH v9 2/7] test/memarea: support memarea test Chengwen Feng
2022-10-12 10:48 ` [PATCH v9 3/7] memarea: support alloc/free/refcnt-update API Chengwen Feng
2022-10-12 10:48 ` [PATCH v9 4/7] test/memarea: support alloc/free/refcnt-update test Chengwen Feng
2022-10-12 10:48 ` [PATCH v9 5/7] memarea: support dump API Chengwen Feng
2022-10-12 10:48 ` [PATCH v9 6/7] test/memarea: support dump test Chengwen Feng
2022-10-12 10:48 ` [PATCH v9 7/7] app/test: add memarea to malloc-perf-autotest Chengwen Feng
2022-10-17 3:40 ` [PATCH v10 0/7] introduce memarea library Chengwen Feng
2022-10-17 3:40 ` [PATCH v10 1/7] memarea: " Chengwen Feng
2022-10-17 3:40 ` [PATCH v10 2/7] test/memarea: support memarea test Chengwen Feng
2022-10-17 3:40 ` [PATCH v10 3/7] memarea: support alloc/free/refcnt-update API Chengwen Feng
2022-10-17 3:40 ` [PATCH v10 4/7] test/memarea: support alloc/free/refcnt-update test Chengwen Feng
2022-10-17 3:40 ` [PATCH v10 5/7] memarea: support dump API Chengwen Feng
2022-10-17 3:40 ` [PATCH v10 6/7] test/memarea: support dump test Chengwen Feng
2022-10-17 3:40 ` [PATCH v10 7/7] app/test: add memarea to malloc-perf-autotest Chengwen Feng
2022-12-13 9:13 ` [PATCH v11 0/6] introduce memarea library Chengwen Feng
2022-12-13 9:13 ` [PATCH v11 1/6] memarea: " Chengwen Feng
2022-12-13 9:13 ` [PATCH v11 2/6] test/memarea: support memarea test Chengwen Feng
2022-12-13 9:13 ` [PATCH v11 3/6] memarea: support alloc/free/refcnt-update API Chengwen Feng
2023-01-10 2:16 ` Dongdong Liu
2022-12-13 9:13 ` [PATCH v11 4/6] test/memarea: support alloc/free/refcnt-update test Chengwen Feng
2022-12-13 9:13 ` [PATCH v11 5/6] memarea: support dump API Chengwen Feng
2022-12-13 9:13 ` [PATCH v11 6/6] test/memarea: support dump test Chengwen Feng
2023-01-10 2:21 ` [PATCH v11 0/6] introduce memarea library Dongdong Liu
2023-01-14 11:49 ` [PATCH v12 " Chengwen Feng
2023-01-14 11:49 ` [PATCH v12 1/6] memarea: " Chengwen Feng
2023-01-15 7:58 ` Morten Brørup
2023-01-20 8:20 ` fengchengwen
2023-01-20 9:05 ` Morten Brørup
2023-01-14 11:49 ` [PATCH v12 2/6] test/memarea: support memarea test Chengwen Feng
2023-01-14 11:49 ` [PATCH v12 3/6] memarea: support alloc and free API Chengwen Feng
2023-01-14 11:49 ` [PATCH v12 4/6] test/memarea: support alloc and free API test Chengwen Feng
2023-01-14 11:49 ` [PATCH v12 5/6] memarea: support dump API Chengwen Feng
2023-01-14 11:49 ` [PATCH v12 6/6] test/memarea: support dump API test Chengwen Feng
2023-02-08 8:24 ` [PATCH v13 0/6] introduce memarea library Chengwen Feng
2023-02-08 8:24 ` [PATCH v13 1/6] memarea: " Chengwen Feng
2023-02-09 0:04 ` Stephen Hemminger
2023-02-09 6:48 ` fengchengwen
2023-02-08 8:24 ` [PATCH v13 2/6] test/memarea: support memarea test Chengwen Feng
2023-02-08 8:24 ` [PATCH v13 3/6] memarea: support alloc and free API Chengwen Feng
2023-02-08 8:24 ` [PATCH v13 4/6] test/memarea: support alloc and free API test Chengwen Feng
2023-02-08 8:24 ` [PATCH v13 5/6] memarea: support dump API Chengwen Feng
2023-02-08 8:24 ` [PATCH v13 6/6] test/memarea: support dump API test Chengwen Feng
2023-02-08 8:43 ` [PATCH v13 0/6] introduce memarea library Morten Brørup
2023-02-09 6:36 ` [PATCH v14 " Chengwen Feng
2023-02-09 6:36 ` [PATCH v14 1/6] memarea: " Chengwen Feng
2023-06-21 10:52 ` Burakov, Anatoly
2023-06-21 12:05 ` Burakov, Anatoly
2023-02-09 6:36 ` [PATCH v14 2/6] test/memarea: support memarea test Chengwen Feng
2023-06-21 11:00 ` Burakov, Anatoly
2023-02-09 6:36 ` [PATCH v14 3/6] memarea: support alloc and free API Chengwen Feng
2023-06-22 15:29 ` Burakov, Anatoly
2023-02-09 6:36 ` [PATCH v14 4/6] test/memarea: support alloc and free API test Chengwen Feng
2023-02-09 6:36 ` [PATCH v14 5/6] memarea: support dump API Chengwen Feng
2023-06-22 15:55 ` Burakov, Anatoly
2023-06-28 1:25 ` fengchengwen
2023-06-28 1:39 ` Thomas Monjalon
2023-06-28 1:48 ` fengchengwen
2023-07-03 10:29 ` Burakov, Anatoly
2023-02-09 6:36 ` [PATCH v14 6/6] test/memarea: support dump API test Chengwen Feng
2023-06-12 13:53 ` [PATCH v14 0/6] introduce memarea library Ferruh Yigit
2023-06-13 9:50 ` fengchengwen
2023-06-13 11:04 ` Burakov, Anatoly
2023-06-13 12:46 ` fengchengwen
2023-07-09 13:00 ` [PATCH v15 " Chengwen Feng
2023-07-09 13:00 ` [PATCH v15 1/6] memarea: " Chengwen Feng
2023-07-09 19:46 ` Stephen Hemminger
2023-07-09 13:00 ` [PATCH v15 2/6] test/memarea: support memarea test Chengwen Feng
2023-07-09 13:00 ` [PATCH v15 3/6] memarea: support alloc and free API Chengwen Feng
2023-07-09 13:00 ` [PATCH v15 4/6] test/memarea: support alloc and free API test Chengwen Feng
2023-07-09 13:00 ` [PATCH v15 5/6] memarea: support dump API Chengwen Feng
2023-07-09 13:00 ` [PATCH v15 6/6] test/memarea: support dump API test Chengwen Feng
2023-07-10 6:49 ` [PATCH v16 0/6] introduce memarea library Chengwen Feng
2023-07-10 6:49 ` [PATCH v16 1/6] memarea: " Chengwen Feng
2023-07-17 13:19 ` Burakov, Anatoly
2023-07-10 6:49 ` [PATCH v16 2/6] test/memarea: support memarea test Chengwen Feng
2023-07-17 13:22 ` Burakov, Anatoly
2023-07-10 6:49 ` [PATCH v16 3/6] memarea: support alloc and free API Chengwen Feng
2023-07-17 13:33 ` Burakov, Anatoly
2023-07-10 6:49 ` [PATCH v16 4/6] test/memarea: support alloc and free API test Chengwen Feng
2023-07-17 13:57 ` Burakov, Anatoly
2023-07-18 2:49 ` fengchengwen
2023-07-10 6:49 ` [PATCH v16 5/6] memarea: support dump API Chengwen Feng
2023-07-10 6:49 ` [PATCH v16 6/6] test/memarea: support dump API test Chengwen Feng
2023-07-19 12:09 ` Burakov, Anatoly
2023-07-20 9:35 ` fengchengwen
2023-07-18 2:40 ` [PATCH v17 0/6] introduce memarea library Chengwen Feng
2023-07-18 2:40 ` [PATCH v17 1/6] memarea: " Chengwen Feng
2023-07-18 2:40 ` [PATCH v17 2/6] test/memarea: support memarea test Chengwen Feng
2023-07-18 2:40 ` [PATCH v17 3/6] memarea: support alloc and free API Chengwen Feng
2023-07-18 2:40 ` [PATCH v17 4/6] test/memarea: support alloc and free API test Chengwen Feng
2023-07-18 2:40 ` [PATCH v17 5/6] memarea: support dump API Chengwen Feng
2023-07-18 2:40 ` [PATCH v17 6/6] test/memarea: support dump API test Chengwen Feng
2023-07-18 13:46 ` [PATCH v18 0/6] introduce memarea library Chengwen Feng
2023-07-18 13:46 ` [PATCH v18 1/6] memarea: " Chengwen Feng
2023-07-18 13:46 ` [PATCH v18 2/6] test/memarea: support memarea test Chengwen Feng
2023-07-18 13:46 ` [PATCH v18 3/6] memarea: support alloc and free API Chengwen Feng
2023-07-18 13:46 ` [PATCH v18 4/6] test/memarea: support alloc and free API test Chengwen Feng
2023-07-18 13:46 ` [PATCH v18 5/6] memarea: support dump API Chengwen Feng
2023-07-18 13:46 ` [PATCH v18 6/6] test/memarea: support dump API test Chengwen Feng
2023-07-20 9:22 ` [PATCH v19 0/6] introduce memarea library Chengwen Feng
2023-07-20 9:22 ` [PATCH v19 1/6] memarea: " Chengwen Feng
2023-07-20 9:22 ` [PATCH v19 2/6] test/memarea: support memarea test Chengwen Feng
2023-07-20 9:22 ` [PATCH v19 3/6] memarea: support alloc and free API Chengwen Feng
2023-07-20 9:22 ` [PATCH v19 4/6] test/memarea: support alloc and free API test Chengwen Feng
2023-07-20 9:22 ` [PATCH v19 5/6] memarea: support dump API Chengwen Feng
2023-07-20 9:22 ` [PATCH v19 6/6] test/memarea: support dump API test Chengwen Feng
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