From: Guy Shattah <sguy@mellanox.com>
To: Michal Nazarewicz <mina86@mina86.com>, Michal Hocko <mhocko@kernel.org>
Cc: Christopher Lameter <cl@linux.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Anshuman Khandual <khandual@linux.vnet.ibm.com>,
Laura Abbott <labbott@redhat.com>,
Vlastimil Babka <vbabka@suse.cz>
Subject: RE: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support
Date: Tue, 17 Oct 2017 14:20:55 +0000 [thread overview]
Message-ID: <AM6PR0502MB3783280D15C96E5A3A831DCBBD4C0@AM6PR0502MB3783.eurprd05.prod.outlook.com> (raw)
In-Reply-To: <xa1tlgk9c3j4.fsf@mina86.com>
> On Tue, Oct 17 2017, Guy Shattah wrote:
> > Are you going to be OK with kernel API which implements contiguous
> > memory allocation? Possibly with mmap style? Many drivers could
> > utilize it instead of having their own weird and possibly non-standard
> > way to allocate contiguous memory. Such API won't be available for
> > user space.
>
> What you describe sounds like CMA. It may be far from perfect but it’s there
> already and drivers which need contiguous memory can allocate it.
>
1. CMA has to preconfigured. We're suggesting mechanism that works 'out of the box'
2. Due to the pre-allocation techniques CMA imposes limitation on maximum
allocated memory. RDMA users often require 1Gb or more, sometimes more.
3. CMA reserves memory in advance, our suggestion is using existing kernel memory
mechanisms (THP for example) to allocate memory.
Guy
next prev parent reply other threads:[~2017-10-17 14:21 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 23:56 [RFC] mmap(MAP_CONTIG) Mike Kravetz
2017-10-04 11:54 ` Michal Nazarewicz
2017-10-04 17:08 ` Mike Kravetz
2017-10-04 21:29 ` Laura Abbott
2017-10-04 13:49 ` Anshuman Khandual
2017-10-04 16:05 ` Christopher Lameter
2017-10-04 17:38 ` Mike Kravetz
2017-10-04 17:35 ` Mike Kravetz
2017-10-05 7:06 ` Vlastimil Babka
2017-10-05 8:58 ` Guy Shattah
2017-10-05 12:36 ` Guy Shattah
2017-10-05 14:30 ` Christopher Lameter
2017-10-12 1:46 ` [RFC PATCH 0/3] Add mmap(MAP_CONTIG) support Mike Kravetz
2017-10-12 1:46 ` [RFC PATCH 1/3] mm/map_contig: Add VM_CONTIG flag to vma struct Mike Kravetz
2017-10-12 1:46 ` [RFC PATCH 2/3] mm/map_contig: Use pre-allocated pages for VM_CONTIG mappings Mike Kravetz
2017-10-12 11:04 ` Anshuman Khandual
2017-10-12 1:46 ` [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support Mike Kravetz
2017-10-12 11:22 ` Anshuman Khandual
2017-10-13 15:14 ` Christopher Lameter
2017-10-12 14:37 ` Michal Hocko
2017-10-12 17:19 ` Mike Kravetz
2017-10-13 8:40 ` Michal Hocko
2017-10-13 15:20 ` Christopher Lameter
2017-10-13 15:28 ` Michal Hocko
2017-10-13 15:42 ` Christopher Lameter
2017-10-13 15:47 ` Michal Hocko
[not found] ` <20171013154747.2jv7rtfqyyagiodn-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2017-10-13 15:56 ` Christopher Lameter
2017-10-13 16:17 ` Michal Hocko
2017-10-15 7:50 ` Guy Shattah
2017-10-16 8:24 ` Michal Hocko
2017-10-16 9:11 ` Guy Shattah
2017-10-16 12:32 ` Michal Hocko
[not found] ` <20171016123248.csntl6luxgafst6q-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2017-10-16 16:00 ` Christopher Lameter
2017-10-16 17:42 ` Michal Hocko
[not found] ` <20171016174229.pz3o4uhzz3qbrp6n-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2017-10-16 17:56 ` Christopher Lameter
2017-10-16 18:17 ` Michal Hocko
2017-10-23 15:25 ` David Nellans
2017-10-17 10:50 ` Guy Shattah
2017-10-17 10:59 ` Michal Hocko
2017-10-17 13:22 ` Michal Nazarewicz
2017-10-17 14:20 ` Guy Shattah [this message]
2017-10-17 17:44 ` Vlastimil Babka
2017-10-17 18:23 ` Mike Kravetz
2017-10-17 19:56 ` Vlastimil Babka
2017-10-16 10:33 ` Michal Nazarewicz
2017-10-16 11:09 ` Guy Shattah
2017-10-16 17:43 ` Mike Kravetz
2017-10-16 18:07 ` Michal Hocko
2017-10-16 20:32 ` Mike Kravetz
2017-10-16 20:58 ` Michal Hocko
2017-10-16 21:03 ` Laura Abbott
2017-10-16 21:18 ` Mike Kravetz
2017-10-17 6:59 ` Vlastimil Babka
2017-10-15 6:58 ` Pavel Machek
2017-10-16 8:18 ` Michal Hocko
2017-10-16 9:54 ` Pavel Machek
2017-10-16 12:18 ` Michal Hocko
[not found] ` <20171016121808.m4sq3g5nxeyxoymc-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2017-10-16 16:02 ` Christopher Lameter
2017-10-16 17:33 ` Michal Hocko
2017-10-16 17:53 ` Christopher Lameter
2017-10-15 8:07 ` Guy Shattah
2017-10-12 10:36 ` [RFC PATCH 0/3] " Anshuman Khandual
2017-10-12 14:25 ` Anshuman Khandual
2017-10-23 22:10 ` [RFC] mmap(MAP_CONTIG) Dave Hansen
2017-10-24 22:49 ` Mike Kravetz
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