From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752466AbaJDNNg (ORCPT ); Sat, 4 Oct 2014 09:13:36 -0400 Received: from mga11.intel.com ([192.55.52.93]:55180 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751105AbaJDNNe (ORCPT ); Sat, 4 Oct 2014 09:13:34 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,862,1389772800"; d="scan'208";a="395495582" From: Andi Kleen To: Andrea Arcangeli Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, Linus Torvalds Subject: Re: [PATCH 12/17] mm: sys_remap_anon_pages References: <1412356087-16115-1-git-send-email-aarcange@redhat.com> <1412356087-16115-13-git-send-email-aarcange@redhat.com> Date: Sat, 04 Oct 2014 06:13:27 -0700 In-Reply-To: <1412356087-16115-13-git-send-email-aarcange@redhat.com> (Andrea Arcangeli's message of "Fri, 3 Oct 2014 19:08:02 +0200") Message-ID: <87iok0q8p4.fsf@tassilo.jf.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andrea Arcangeli writes: > This new syscall will move anon pages across vmas, atomically and > without touching the vmas. > > It only works on non shared anonymous pages because those can be > relocated without generating non linear anon_vmas in the rmap code. ... > It is an alternative to mremap. Why a new syscall? Couldn't mremap do this transparently? -Andi -- ak@linux.intel.com -- Speaking for myself only