From: Dave Hansen <dave.hansen@intel.com>
To: Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-api@vger.kernel.org
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
Michal Nazarewicz <mina86@mina86.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Guy Shattah <sguy@mellanox.com>, Christoph Lameter <cl@linux.com>
Subject: Re: [RFC] mmap(MAP_CONTIG)
Date: Mon, 23 Oct 2017 15:10:05 -0700 [thread overview]
Message-ID: <b2dee13d-a19a-2b53-7317-7227749375d9@intel.com> (raw)
In-Reply-To: <21f1ec96-2822-1189-1c95-79a2bb491571@oracle.com>
On 10/03/2017 04:56 PM, Mike Kravetz wrote:
> mmap(MAP_CONTIG) would have the following semantics:
> - The entire mapping (length size) would be backed by physically contiguous
> pages.
> - If 'length' physically contiguous pages can not be allocated, then mmap
> will fail.
> - MAP_CONTIG only works with MAP_ANONYMOUS mappings.
> - MAP_CONTIG will lock the associated pages in memory. As such, the same
> privileges and limits that apply to mlock will also apply to MAP_CONTIG.
> - A MAP_CONTIG mapping can not be expanded.
Do you also need to lock out the NUMA migration APIs somehow? What
about KSM (or does it already ignore VM_LOCKED)?
> - At fork time, private MAP_CONTIG mappings will be converted to regular
> (non-MAP_CONTIG) mapping in the child. As such a COW fault in the child
> will not require a contiguous allocation.
Maybe we should just define it as acting as if it had MADV_DONTFORK set
on it, and also that it doesn't allow MADV_DONTFORK to be called on it.
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next prev parent reply other threads:[~2017-10-23 22:10 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 23:56 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
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 ` Dave Hansen [this message]
2017-10-24 22:49 ` [RFC] mmap(MAP_CONTIG) Mike Kravetz
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