linux-kernel - Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP

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Message-ID: <20171016121808.m4sq3g5nxeyxoymc@dhcp22.suse.cz>
Date:   Mon, 16 Oct 2017 14:18:08 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Christopher Lameter <cl@...ux.com>,
        Mike Kravetz <mike.kravetz@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Michal Nazarewicz <mina86@...a86.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Guy Shattah <sguy@...lanox.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Laura Abbott <labbott@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support

On Mon 16-10-17 11:54:47, Pavel Machek wrote:
> On Mon 2017-10-16 10:18:04, Michal Hocko wrote:
> > On Sun 15-10-17 08:58:56, Pavel Machek wrote:
[...]
> > > So you'd suggest using ioctl() for allocating memory?
> > 
> > Why not using standard mmap on the device fd?
> 
> No, sorry, that's something very different work, right? Lets say I
> have a disk, and I'd like to write to it, using continguous memory for
> performance.
> 
> So I mmap(MAP_CONTIG) 1GB working of working memory, prefer some data
> structures there, maybe recieve from network, then decide to write
> some and not write some other.

Why would you want this?
-- 
Michal Hocko
SUSE Labs