From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756701AbcIYSWd (ORCPT ); Sun, 25 Sep 2016 14:22:33 -0400 Received: from mail-wm0-f68.google.com ([74.125.82.68]:33639 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753951AbcIYSWc (ORCPT ); Sun, 25 Sep 2016 14:22:32 -0400 Message-ID: <1474827749.8570.12.camel@gmail.com> Subject: Re: thousands of kworker processes with 4.7.x and 4.8-rc* From: Mike Galbraith To: Tomasz Chmielewski Cc: LKML Date: Sun, 25 Sep 2016 20:22:29 +0200 In-Reply-To: <1474824072.3990.11.camel@gmail.com> References: <35b2acf87bfeaf1d04f2cf3d10b99b6e@admin.virtall.com> <20acd5801291dff03ed56b63919b9249@admin.virtall.com> <1474639800.4025.29.camel@gmail.com> <50d06a3b797091821d190196b48e8d52@admin.virtall.com> <1474824072.3990.11.camel@gmail.com> Content-Type: text/plain; charset="us-ascii" X-Mailer: Evolution 3.16.5 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2016-09-25 at 19:21 +0200, Mike Galbraith wrote: > On Sun, 2016-09-25 at 21:40 +0900, Tomasz Chmielewski wrote: > > > The problem is the allocator. > > > > -CONFIG_SLUB=y > > +CONFIG_SLAB=y > > > > > > With SLUB, I'm getting a handful of kworker processes, as expected. > > > > With SLAB, I'm getting thousands of kworker processes. > > > > > > Not sure if that's expected behaviour or not. > > I seriously doubt 1500+ kworkers piling up is expected. > > 4.7.0-rc4 47 > 4.7.0-rc5 1592 > > Presuming you didn't switch to SLAB and/or change userspace all around > while testing, that would still indicate a kernel regression lurking > between rc4 and rc5. Nevermind, seems config change was how you met the thing. FWIW, I turned on SLAB with a distro config here, and see no such behavior. If I could reproduce, I'd take the busted config back to older kernels. -Mike