From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christopher Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Subject: Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support
Date: Mon, 16 Oct 2017 11:02:24 -0500 (CDT)
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To: Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>, Mike Kravetz <mike.kravetz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Marek Szyprowski <m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>, Michal Nazarewicz <mina86-deATy8a+UHjQT0dZR+AlfA@public.gmane.org>, "Aneesh Kumar K . V" <aneesh.kumar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>, Joonsoo Kim <iamjoonsoo.kim-Hm3cg6mZ9cc@public.gmane.org>, Guy Shattah <sguy-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>, Anshuman Khandual <khandual-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>, Laura Abbott <labbott-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>
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On Mon, 16 Oct 2017, Michal Hocko wrote:

> > 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?

Because we are receiving a 1GB block of data and then wan to write it to
disk. Maybe we want to modify things a bit and may not write all that we
received.