[dpdk-dev] [PATCH v3 4/5] mem: use memfd for no-huge mode

Burakov, Anatoly anatoly.burakov at intel.com
Thu Dec 13 12:59:42 CET 2018


On 13-Dec-18 11:43 AM, Anatoly Burakov wrote:
> When running in no-huge mode, we anonymously allocate our memory.
> While this works for regular NICs and vdev's, it's not suitable
> for memory sharing scenarios such as virtio with vhost_user
> backend.
> 
> To fix this, allocate no-huge memory using memfd, and register
> it with memalloc just like any other memseg fd. This will enable
> using rte_memseg_get_fd() API with --no-huge EAL flag.
> 
> Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
> Acked-by: Tiwei Bie <tiwei.bie at intel.com>
> ---
> 
> Notes:
>      v3:
>      - Clarify release notes to state that the changes apply to
>        virtio-user NICs rather than virtio in general
>      
>      v2:
>      - Detect memfd support at compile time
>      - Change memfd-related log level to debug
> 
>   doc/guides/rel_notes/release_19_02.rst   |  5 +++
>   lib/librte_eal/linuxapp/eal/eal_memory.c | 54 +++++++++++++++++++++++-
>   2 files changed, 57 insertions(+), 2 deletions(-)
> 
> diff --git a/doc/guides/rel_notes/release_19_02.rst b/doc/guides/rel_notes/release_19_02.rst
> index 960098582..f733ad139 100644
> --- a/doc/guides/rel_notes/release_19_02.rst
> +++ b/doc/guides/rel_notes/release_19_02.rst
> @@ -23,6 +23,11 @@ DPDK Release 19.02
>   New Features
>   ------------
>   
> +* **Support for using VirtIO without hugepages**

^^ oops, forgot to fix the title... Should be virtio-user.

-- 
Thanks,
Anatoly


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