From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758938AbaEMHc4 (ORCPT ); Tue, 13 May 2014 03:32:56 -0400 Received: from mail-qc0-f181.google.com ([209.85.216.181]:47177 "EHLO mail-qc0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751851AbaEMHcy convert rfc822-to-8bit (ORCPT ); Tue, 13 May 2014 03:32:54 -0400 MIME-Version: 1.0 In-Reply-To: <5370E4B4.1060802@oracle.com> References: <1399552888-11024-1-git-send-email-kirill.shutemov@linux.intel.com> <1399552888-11024-3-git-send-email-kirill.shutemov@linux.intel.com> <20140508145729.3d82d2c989cfc483c94eb324@linux-foundation.org> <5370E4B4.1060802@oracle.com> From: Armin Rigo Date: Tue, 13 May 2014 09:32:13 +0200 X-Google-Sender-Auth: Q0GhWn4uwckW03D_dzQR5p0L4Kg Message-ID: Subject: Re: [PATCH 2/2] mm: replace remap_file_pages() syscall with emulation To: Sasha Levin Cc: Andrew Morton , "Kirill A. Shutemov" , Linus Torvalds , linux-kernel@vger.kernel.org, linux-mm@kvack.org, peterz@infradead.org, mingo@kernel.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sasha, On 12 May 2014 17:11, Sasha Levin 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. A bientôt, Armin.