From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Coquelin Subject: Re: [PATCH v3 4/5] mem: use memfd for no-huge mode Date: Fri, 14 Dec 2018 11:06:02 +0100 Message-ID: <251a4847-b88b-87a2-e2e5-0a3ce8429f17@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: John McNamara , Marko Kovacevic , przemyslawx.lal@intel.com, kuralamudhan.ramakrishnan@intel.com, ivan.coughlan@intel.com, tiwei.bie@intel.com, ray.kinsella@intel.com To: Anatoly Burakov , dev@dpdk.org Return-path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id B26921B9F1 for ; Fri, 14 Dec 2018 11:06:09 +0100 (CET) In-Reply-To: Content-Language: en-US List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 12/13/18 12:43 PM, 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 > Acked-by: Tiwei Bie > --- > > 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** > + With the title change you suggested: Reviewed-by: Maxime Coquelin Thanks, Maxime