From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68D0BC433E0 for ; Sat, 30 May 2020 10:13:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D2AC20776 for ; Sat, 30 May 2020 10:13:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728585AbgE3KN5 (ORCPT ); Sat, 30 May 2020 06:13:57 -0400 Received: from jabberwock.ucw.cz ([46.255.230.98]:35442 "EHLO jabberwock.ucw.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725813AbgE3KN4 (ORCPT ); Sat, 30 May 2020 06:13:56 -0400 Received: by jabberwock.ucw.cz (Postfix, from userid 1017) id 197F31C0BD2; Sat, 30 May 2020 12:13:55 +0200 (CEST) Date: Sat, 30 May 2020 12:13:54 +0200 From: Pavel Machek To: Edward Shishkin Cc: ReiserFS development mailing list , linux-kernel Subject: Re: [ANNOUNCE] Reiser5: Data Tiering. Burst Buffers. Speedup synchronous modifications Message-ID: <20200530101354.GA630@duo.ucw.cz> References: <4f919dee-5b72-9269-2bd0-6818a7167864@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="IS0zKkzwUGydFO0o" Content-Disposition: inline In-Reply-To: <4f919dee-5b72-9269-2bd0-6818a7167864@gmail.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --IS0zKkzwUGydFO0o Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > For example, you can use proxy device to store hot data only. With > such strategy new logical blocks (which are always "cold") will always > go to the main storage (in contrast with Burst Buffers, where new > logical blocks first get written to the proxy disk). Once in a while > you need to scan your volume in order to push colder data out, and > pull hotter data in the proxy disk. Reiser5 contains a common > interface for this. It is possible to maintain per-file, or even per- > blocks-extent "temperature" of data (e.g. as a generation counter), Would it be possible to offer userland interface for this? I can probably say that mp3/video files should be cold, while some source files should be hot, etc... Best regards, Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --IS0zKkzwUGydFO0o Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EABECAB0WIQRPfPO7r0eAhk010v0w5/Bqldv68gUCXtIx4gAKCRAw5/Bqldv6 8oF2AJ4hfCKfuD86iK8M3DhcyfcE3WlYlACbBEXlg9NI2nOms1moiyGTWJQjS68= =x8me -----END PGP SIGNATURE----- --IS0zKkzwUGydFO0o--