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=-2.1 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,PLING_QUERY,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 7DE91C433E0 for ; Sun, 31 May 2020 10:34:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5460720776 for ; Sun, 31 May 2020 10:34:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728061AbgEaKee (ORCPT ); Sun, 31 May 2020 06:34:34 -0400 Received: from jabberwock.ucw.cz ([46.255.230.98]:42726 "EHLO jabberwock.ucw.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725898AbgEaKed (ORCPT ); Sun, 31 May 2020 06:34:33 -0400 Received: by jabberwock.ucw.cz (Postfix, from userid 1017) id 59EC31C0BD2; Sun, 31 May 2020 12:34:32 +0200 (CEST) Date: Sun, 31 May 2020 12:34:31 +0200 From: Pavel Machek To: kernel list , Andrew Morton Cc: mhocko@suse.cz, vbabka@suse.cz Subject: 5.7-rc0: kswapd eats cpu during a disk test?! Message-ID: <20200531103431.GA28429@amd> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="gBBFr7Ir9EOA20Yy" Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --gBBFr7Ir9EOA20Yy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! This is simple cat /dev/sda > /dev/zero... on thinkpad x60 (x86-32), with spinning rust. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1000 root 20 0 0 0 0 R 53.3 0.0 57:34.93 kswa= pd0 27897 root 20 0 6976 580 536 R 44.5 0.0 1:44.53 cat It keeps both CPUs busy... and I don't think that's right. --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --gBBFr7Ir9EOA20Yy Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAl7TiDcACgkQMOfwapXb+vIOgwCgwPJXAvc3BlYb65/G1EdTUOdb J0YAnR/wwMOyH2kOpkKICFhV7ky6ml2w =vv3Y -----END PGP SIGNATURE----- --gBBFr7Ir9EOA20Yy--