From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org, andras.kovacs@ericsson.com,
laszlo.vadkeri@ericsson.com, keith.wiles@intel.com,
benjamin.walker@intel.com, bruce.richardson@intel.com,
thomas@monjalon.net
Subject: Re: [dpdk-dev] [RFC v2 00/23] Dynamic memory allocation for DPDK
Date: Tue, 19 Dec 2017 16:09:41 +0000 [thread overview]
Message-ID: <f4805eb0-5304-6de9-3b03-38f4d6624b8e@intel.com> (raw)
In-Reply-To: <20171219080622.1c1bd5ca@xeon-e3>
On 19-Dec-17 4:06 PM, Stephen Hemminger wrote:
> On Tue, 19 Dec 2017 16:02:51 +0000
> "Burakov, Anatoly" <anatoly.burakov@intel.com> wrote:
>
>> On 19-Dec-17 3:46 PM, Stephen Hemminger wrote:
>>> On Tue, 19 Dec 2017 11:14:27 +0000
>>> Anatoly Burakov <anatoly.burakov@intel.com> wrote:
>>>
>>>> This patchset introduces a prototype implementation of dynamic memory allocation
>>>> for DPDK. It is intended to start a conversation and build consensus on the best
>>>> way to implement this functionality. The patchset works well enough to pass all
>>>> unit tests, and to work with traffic forwarding, provided the device drivers are
>>>> adjusted to ensure contiguous memory allocation where it matters.
>>>
>>>
>>> What exact functionality is this patchset trying to enable.
>>> It isn't clear what is broken now. Is it a cleanup or something that
>>> is being motivated by memory layout issues?
>>>
>>
>> Hi Stephen,
>>
>> Apologies for not making that clear enough in the cover letter.
>>
>> The big issue this patchset is trying to solve is the static-ness of
>> DPDK's memory allocation. I.e. you reserve memory on startup, and that's
>> it - you can't allocate any more memory from the system, and you can't
>> free it back without stopping the application.
>>
>> With this patchset, you can do exactly that. You can basically start
>> with zero memory preallocated, and allocate (and free) as you go. For
>> example, if you apply this patchset and run malloc autotest, after
>> startup you will have used perhaps a single 2MB page. While the test is
>> running, you are going to allocate something to the tune of 14MB per
>> socket, and at the end you're back at eating 2MB of hugepage memory,
>> while all of the memory you used for autotest will be freed back to the
>> system. That's the main use case this patchset is trying to address.
>>
>> Down the line, there are other issues to be solved, which are outlined
>> in the cover letter (the aforementioned "discussion points"), but for
>> this iteration, dynamic allocation/free of DPDK memory is the one issue
>> that is being addressed.
>>
>
> Ok, maybe name it "memory hot add/remove" since dynamic memory allocation
> to me implies redoing malloc.
>
Well, it _kind of_ redoes malloc in the process as we need to handle
holes in the address space, but sure, something like "memory hotplug"
would've perhaps been a more suitable name. Thanks for your feedback, it
will certainly be taken into account for when an inevitable v1 comes :)
--
Thanks,
Anatoly
next prev parent reply other threads:[~2017-12-19 16:09 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-19 11:14 Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 01/23] eal: move get_virtual_area out of linuxapp eal_memory.c Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 02/23] eal: add function to report number of detected sockets Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 03/23] eal: add rte_fbarray Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 04/23] eal: move all locking to heap Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 05/23] eal: protect malloc heap stats with a lock Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 06/23] eal: make malloc a doubly-linked list Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 07/23] eal: make malloc_elem_join_adjacent_free public Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 08/23] eal: add "single file segments" command-line option Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 09/23] eal: add "legacy memory" option Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 10/23] eal: read hugepage counts from node-specific sysfs path Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 11/23] eal: replace memseg with memseg lists Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 12/23] eal: add support for dynamic memory allocation Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 13/23] eal: make use of dynamic memory allocation for init Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 14/23] eal: add support for dynamic unmapping of pages Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 15/23] eal: add API to check if memory is physically contiguous Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 16/23] eal: enable dynamic memory allocation/free on malloc/free Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 17/23] eal: add backend support for contiguous memory allocation Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 18/23] eal: add rte_malloc support for allocating contiguous memory Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 19/23] eal: enable reserving physically contiguous memzones Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 20/23] eal: make memzones use rte_fbarray Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 21/23] mempool: add support for the new memory allocation methods Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 22/23] vfio: allow to map other memory regions Anatoly Burakov
2017-12-19 11:14 ` [dpdk-dev] [RFC v2 23/23] eal: map/unmap memory with VFIO when alloc/free pages Anatoly Burakov
2017-12-19 15:46 ` [dpdk-dev] [RFC v2 00/23] Dynamic memory allocation for DPDK Stephen Hemminger
2017-12-19 16:02 ` Burakov, Anatoly
2017-12-19 16:06 ` Stephen Hemminger
2017-12-19 16:09 ` Burakov, Anatoly [this message]
2017-12-21 21:38 ` Walker, Benjamin
2017-12-22 9:13 ` Burakov, Anatoly
2017-12-26 17:19 ` Walker, Benjamin
2018-02-02 19:28 ` Yongseok Koh
2018-02-05 10:03 ` Burakov, Anatoly
2018-02-05 10:18 ` Nélio Laranjeiro
2018-02-05 10:36 ` Burakov, Anatoly
2018-02-06 9:10 ` Nélio Laranjeiro
2018-02-14 2:01 ` Yongseok Koh
2018-02-14 9:32 ` Burakov, Anatoly
2018-02-14 18:13 ` Yongseok Koh
2018-01-13 14:13 ` Burakov, Anatoly
2018-01-23 22:33 ` Yongseok Koh
2018-01-25 16:18 ` Burakov, Anatoly
2018-02-14 8:04 ` Thomas Monjalon
2018-02-14 10:07 ` Burakov, Anatoly
2018-04-25 16:02 ` Burakov, Anatoly
2018-04-25 16:12 ` Stephen Hemminger
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