From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-f173.google.com (mail-ie0-f173.google.com [209.85.223.173]) by kanga.kvack.org (Postfix) with ESMTP id 300176B006C for ; Wed, 1 Oct 2014 11:45:53 -0400 (EDT) Received: by mail-ie0-f173.google.com with SMTP id tp5so624838ieb.4 for ; Wed, 01 Oct 2014 08:45:53 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id w2si4606168icy.81.2014.10.01.08.45.51 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 Oct 2014 08:45:52 -0700 (PDT) From: Jeff Moyer Subject: Re: [PATCH v11 00/21] Add support for NV-DIMMs to ext4 References: <1411677218-29146-1-git-send-email-matthew.r.wilcox@intel.com> <15705.1412070301@turing-police.cc.vt.edu> <20140930144854.GA5098@wil.cx> <123795.1412088827@turing-police.cc.vt.edu> <20140930160841.GB5098@wil.cx> <15704.1412109476@turing-police.cc.vt.edu> <62749.1412113956@turing-police.cc.vt.edu> Date: Wed, 01 Oct 2014 11:45:47 -0400 In-Reply-To: <62749.1412113956@turing-police.cc.vt.edu> (Valdis Kletnieks's message of "Tue, 30 Sep 2014 17:52:36 -0400") Message-ID: MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Valdis.Kletnieks@vt.edu Cc: Andreas Dilger , Matthew Wilcox , Matthew Wilcox , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Valdis.Kletnieks@vt.edu writes: > As long as we're at it, if we go that route we probably *also* want a > way for a program to specify it at open() time (for instance, for the > use of backup programs) - that should minimize the infamous "everything > runs like a pig after the backup finishes running because the *useful* > pages are all cache-cold". This sounds an awful lot like posix_fadvise' POSIX_FADV_NOREUSE flag. Whether the implementation lives up to your expectations is another matter, but at least the interface is already there. Cheers, Jeff -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org