linux-kernel - Re: remap_file

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Message-ID: <CAAih0Nige+Cjoh6c=718P2R4BV5=RczuGh17voVgZEc_hyz16Q@mail.gmail.com>
Date:	Mon, 26 May 2014 08:52:23 -0500
From:	Jeff Smith <jsmith.lkml@...il.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Kenny Simpson <theonetruekenny@...il.com>,
	Michal Hocko <mhocko@...e.cz>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: remap_file_pages() use

I've got no real issues at this point, but could you perhaps elaborate
a bit on the rough order of magnitude of "long" time and what cases
would be slower? I'm pretty sure that some places I've worked that
still have some remap_file_pages() logic in place aren't too religious
about checking dmesg.
--Jeff

On Mon, May 26, 2014 at 8:47 AM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> Jeff Smith wrote:
>> OK, I misinterpreted "the overlapped part of the mapping(s) will be
>> discarded" as discarding the -new- mappings. My objections about
>> needing a replacement for remap_file_pages() are gone, but my concerns
>> about existing code still remain.
>
> As I said, emulation will be there for long time. With warning in dmesg.
> The emulation is interface-compatible, but slower in some cases (not
> your's).
>
> --
>  Kirill A. Shutemov
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