From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
linux-mm <linux-mm@kvack.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [RFC, PATCH 0/8] remap_file_pages() decommission
Date: Wed, 7 May 2014 02:03:23 +0300 [thread overview]
Message-ID: <20140506230323.GA14821@node.dhcp.inet.fi> (raw)
In-Reply-To: <CA+55aFwUO5ubckFFEF+R=yos-Qd3Br4Fy3-LpXL0bDWCmMhb6g@mail.gmail.com>
On Tue, May 06, 2014 at 02:51:24PM -0700, Linus Torvalds wrote:
> On Tue, May 6, 2014 at 2:35 PM, Andrew Morton <akpm@linux-foundation.org> wrote:
> > On Tue, 6 May 2014 17:37:24 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
> >
> >> This patchset replaces the syscall with emulation which creates new VMA on
> >> each remap and remove code to support non-linear mappings.
> >>
> >> Nonlinear mappings are pain to support and it seems there's no legitimate
> >> use-cases nowadays since 64-bit systems are widely available.
> >>
> >> It's not yet ready to apply. Just to give rough idea of what can we get if
> >> we'll deprecated remap_file_pages().
> >>
> >> I need to split patches properly and write correct commit messages. And there's
> >> still code to remove.
> >
> > hah. That's bold. It would be great if we can get away with this.
> >
> > Do we have any feeling for who will be impacted by this and how badly?
>
> I *would* love to get rid of the nonlinear mappings, but I really have
> zero visibility into who ended up using it. I assume it's a "Oracle on
> 32-bit x86" kind of thing.
There're funny PyPy people who wants to use remap_file_pages() in new code to
build software transaction memory[1]. It sounds just crazy to me.
[1] https://lwn.net/Articles/587923/
> I think this is more of a distro question. Plus perhaps an early patch
> to just add a warning first so that we can see who it triggers for?
Something like this?
next prev parent reply other threads:[~2014-05-06 23:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-06 14:37 [RFC, PATCH 0/8] remap_file_pages() decommission Kirill A. Shutemov
2014-05-06 14:37 ` [PATCH 1/8] mm: replace remap_file_pages() syscall with emulation Kirill A. Shutemov
2014-10-08 6:50 ` Vineet Gupta
2014-10-08 10:03 ` Kirill A. Shutemov
2014-05-06 14:37 ` [PATCH 2/8] mm: kill vm_operations_struct->remap_pages Kirill A. Shutemov
2014-05-19 15:03 ` Christoph Hellwig
2014-05-19 15:14 ` Kirill A. Shutemov
2014-05-06 14:37 ` [PATCH 3/8] mm: kill zap_details->nonlinear_vma Kirill A. Shutemov
2014-05-06 14:37 ` [PATCH 4/8] mm, rmap: kill rmap_walk_control->file_nonlinear() Kirill A. Shutemov
2014-05-06 14:37 ` [PATCH 5/8] mm, rmap: kill vma->shared.nonlinear Kirill A. Shutemov
2014-05-06 14:37 ` [PATCH 6/8] mm, rmap: kill mapping->i_mmap_nonlinear Kirill A. Shutemov
2014-05-06 14:37 ` [PATCH 7/8] mm: kill VM_NONLINEAR and FAULT_FLAG_NONLINEAR Kirill A. Shutemov
2014-05-06 14:37 ` [PATCH 8/8] mm, x86: kill pte_to_pgoff(), pgoff_to_pte() and pte_file*() Kirill A. Shutemov
2014-05-06 21:35 ` [RFC, PATCH 0/8] remap_file_pages() decommission Andrew Morton
2014-05-06 21:51 ` Linus Torvalds
2014-05-06 23:03 ` Kirill A. Shutemov [this message]
2014-05-06 23:28 ` Andrew Morton
2014-05-07 9:12 ` Peter Zijlstra
2014-05-07 16:46 ` Andrew Morton
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