From: Matthew Wilcox <willy@infradead.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>,
Till Smejkal <till.smejkal@googlemail.com>,
Richard Henderson <rth@twiddle.net>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
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Subject: Re: [RFC PATCH 00/13] Introduce first class virtual address spaces
Date: Wed, 15 Mar 2017 09:57:36 -0700 [thread overview]
Message-ID: <20170315165736.GE4033@bombadil.infradead.org> (raw)
In-Reply-To: <CALCETrX5gv+zdhOYro4-u3wGWjVCab28DFHPSm5=BVG_hKxy3A@mail.gmail.com>
On Wed, Mar 15, 2017 at 09:51:31AM -0700, Andy Lutomirski wrote:
> > VAS segments on the other side allow sharing of pure in memory data by
> > arbitrary related tasks without the need of a file. This becomes especially
> > interesting if one combines VAS segments with non-volatile memory since one can keep
> > data structures in the NVM and still be able to share them between multiple tasks.
>
> What's wrong with regular mmap?
I think it's the usual misunderstandings about how to use mmap.
>From the paper:
Memory-centric computing demands careful organization of the
virtual address space, but interfaces such as mmap only give limited
control. Some systems do not support creation of address regions at
specific offsets. In Linux, for example, mmap does not safely abort if
a request is made to open a region of memory over an existing region;
it simply writes over it.
The correct answer of course, is "Don't specify MAP_FIXED". Specify the
'hint' address, and if you don't get it, either fix up your data structure
pointers, or just abort and complain noisily.
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next prev parent reply other threads:[~2017-03-15 16:57 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-13 22:14 [RFC PATCH 00/13] Introduce first class virtual address spaces Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 01/13] mm: Add mm_struct argument to 'mmap_region' Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 02/13] mm: Add mm_struct argument to 'do_mmap' and 'do_mmap_pgoff' Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 03/13] mm: Rename 'unmap_region' and add mm_struct argument Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 04/13] mm: Add mm_struct argument to 'get_unmapped_area' and 'vm_unmapped_area' Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 05/13] mm: Add mm_struct argument to 'mm_populate' and '__mm_populate' Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 06/13] mm/mmap: Export 'vma_link' and 'find_vma_links' to mm subsystem Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 07/13] kernel/fork: Split and export 'mm_alloc' and 'mm_init' Till Smejkal
2017-03-14 10:18 ` David Laight
2017-03-14 16:18 ` Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 08/13] kernel/fork: Define explicitly which mm_struct to duplicate during fork Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 09/13] mm/memory: Add function to one-to-one duplicate page ranges Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 10/13] mm: Introduce first class virtual address spaces Till Smejkal
2017-03-13 23:52 ` Greg Kroah-Hartman
2017-03-14 0:24 ` Till Smejkal
2017-03-14 1:35 ` Vineet Gupta
2017-03-14 2:34 ` Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 11/13] mm/vas: Introduce VAS segments - shareable address space regions Till Smejkal
2017-03-13 22:27 ` Matthew Wilcox
2017-03-13 22:45 ` Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 12/13] mm/vas: Add lazy-attach support for first class virtual address spaces Till Smejkal
2017-03-13 22:14 ` [RFC PATCH 13/13] fs/proc: Add procfs " Till Smejkal
2017-03-14 0:18 ` [RFC PATCH 00/13] Introduce " Richard Henderson
2017-03-14 0:39 ` Till Smejkal
2017-03-14 1:02 ` Richard Henderson
2017-03-14 1:31 ` Till Smejkal
2017-03-14 0:58 ` Andy Lutomirski
2017-03-14 2:07 ` Till Smejkal
2017-03-14 5:37 ` Andy Lutomirski
2017-03-14 16:12 ` Till Smejkal
2017-03-14 19:53 ` Chris Metcalf
2017-03-14 21:14 ` Till Smejkal
2017-03-15 16:51 ` Andy Lutomirski
2017-03-15 16:57 ` Matthew Wilcox [this message]
2017-03-15 19:44 ` Till Smejkal
2017-03-15 19:47 ` Rich Felker
2017-03-15 21:30 ` Till Smejkal
2017-03-15 20:06 ` Andy Lutomirski
2017-03-15 22:02 ` Till Smejkal
2017-03-15 22:09 ` Luck, Tony
2017-03-15 23:18 ` Till Smejkal
2017-03-16 8:21 ` Thomas Gleixner
2017-03-16 17:29 ` Till Smejkal
2017-03-16 17:42 ` Thomas Gleixner
2017-03-16 17:50 ` Till Smejkal
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