linux-kernel - Re: [PATCH 2/2] mm: replace remap_file

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Date:	Tue, 13 May 2014 08:57:41 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Armin Rigo <arigo@...es.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	peterz@...radead.org, mingo@...nel.org
Subject: Re: [PATCH 2/2] mm: replace remap_file_pages() syscall with emulation

On 05/13/2014 03:32 AM, Armin Rigo wrote:
> Hi Sasha,
> 
> On 12 May 2014 17:11, Sasha Levin <sasha.levin@...cle.com> wrote:
>> Since we can't find any actual users,
> 
> The PyPy project doesn't count as an "actual user"?  It's not just an
> idea in the air.  It's beta code that is already released (and open
> source):
> 
> http://morepypy.blogspot.ch/2014/04/stm-results-and-second-call-for.html
> 
> The core library is available from there (see the test suite in c7/test/):
> 
> https://bitbucket.org/pypy/stmgc
> 
> I already reacted to the discussion here by making remap_file_pages()
> optional (#undef USE_REMAP_FILE_PAGES) but didn't measure the
> performance impact of this, if any (I expect it to be reasonable).
> Still, if you're looking for a real piece of code using
> remap_file_pages(), it's one.

Oh, I don't have anything against PyPy, I just wasn't aware it used
remap_file_pages() (I think I've missed the discussion in the parallel
thread).

Indeed it is a user, have you tried it with a kernel that is running
Kirill's patch set to replace remap_file_pages()?


Thanks,
Sasha

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