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=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 9E360C43381 for ; Wed, 27 Mar 2019 11:36:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 63CBB2147C for ; Wed, 27 Mar 2019 11:36:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553686594; bh=NWH1kS5Iq0MgMjCjJ0XKLsrYYrQu5Nf+VQBY8PFPAGU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=oCaKmWdkqH9/0mnBPWiSMaUKEYQDrskVTJP5T3uLIwInFx5G8gI9snafrRLFDozyU 6ewYmIR3Ah6PzWe+Iu7poLXdflYfb35RYkssnoYC4wXoG324P+4mamV7mvPEyHDrMI /W1BTUWOjhROl8oJsyz1ie2gt7UcMKUffsaHQ3Eo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728270AbfC0Lgd (ORCPT ); Wed, 27 Mar 2019 07:36:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:46742 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726262AbfC0Lgc (ORCPT ); Wed, 27 Mar 2019 07:36:32 -0400 Received: from localhost (unknown [193.47.165.251]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1DF4820700; Wed, 27 Mar 2019 11:36:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553686591; bh=NWH1kS5Iq0MgMjCjJ0XKLsrYYrQu5Nf+VQBY8PFPAGU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=t6F479tboG2QfsqT0CSQCfwuRs7a7+IUxuzELJZIGgF8992HDsxaeOgqxJsR4HMkr k7l8gJqBsC9rIEibWJXAdqWCuGabs0xTvNwskIbFzQX3rA04yKyTRu8jQXHWmVzoov 8E1MT+hYmSKBSMxmvU3upSOuBMHVq+ASzdLKlXfY= Date: Wed, 27 Mar 2019 13:36:28 +0200 From: Leon Romanovsky To: Borislav Petkov Cc: Joe Perches , "Rafael J . Wysocki" , Thomas Gleixner , Ingo Molnar , x86 , "H. Peter Anvin" , linux-pm , LKML Subject: Re: [PATCH -next v1] x86/apic: Reduce print level of CPU limit announcement Message-ID: <20190327113628.GS22899@mtr-leonro.mtl.com> References: <20190327090905.5588-1-leon@kernel.org> <20190327093844.GO22899@mtr-leonro.mtl.com> <55774b1a8c82e94b2796c992889929f1da905d9b.camel@perches.com> <20190327095337.GP22899@mtr-leonro.mtl.com> <20190327101133.GQ22899@mtr-leonro.mtl.com> <20190327101815.GB32571@zn.tnic> <20190327105024.GR22899@mtr-leonro.mtl.com> <20190327111452.GC32571@zn.tnic> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="R+Rs1qz93vBJxC1z" Content-Disposition: inline In-Reply-To: <20190327111452.GC32571@zn.tnic> User-Agent: Mutt/1.11.3 (2019-02-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --R+Rs1qz93vBJxC1z Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Mar 27, 2019 at 12:14:52PM +0100, Borislav Petkov wrote: > On Wed, Mar 27, 2019 at 12:50:24PM +0200, Leon Romanovsky wrote: > > It is how we are internally running verification and development, > > with KERN_DEBUG level, we need it to catch bugs. > > And what is the big deal with seeing those messages? Why are *exactly* > those two such a big problem and the gazillion other debug messages are > fine? At the end, it is reduced to our usage, we are running QEMU inside docker to test kernel changes with limitation on number of CPUs to use. The systems are optimized to boot kernel as soon as possible in order to run tests and on my machine (64 CPUs) reduce is visible: from ~2.6 sec to ~2.3 sec from execution to kernel boot. > > > This "some config option" is dynamic debug prints and most probably it > > is enabled in your or any kernel developer in the world. > > I personally don't use it because it only gets in the way. > > -- > Regards/Gruss, > Boris. > > Good mailing practices for 400: avoid top-posting and trim the reply. --R+Rs1qz93vBJxC1z Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBAgAGBQJcm2A8AAoJEORje4g2clin8xQQAKUj1Y1NNUgVPqfZqgwLkOge aGDBOAr9gkfbwVpuKlWkTtlsgyJDYF3Pl6VU5j2q6ZnaCbpUhZG1wd0ni8O/Y2Dj 7O+awJg88azYsn0AVXZB5HKP6AHn2hhfAdfUl1H7kn13iCKI3IZ8TnsBaeFZ3twv V1Ufpv2iQ2LCaZeGsqdQszHNBGeSfbLGlEKWuA3JvTXNzyrLB4etG2TV2qlBMFAk M8tpRhXPqfFhdArc2pGTkQiUvm3BnVQadQ0lf0ykj7tYrg3aHO+U1TKOP3DKY8nR nu3rWO+01MORxI7n5OTkm36IREqbcLnGh7UhdZYjnjclsV4CCzQRvIlDkrdsXRQ+ wCvSTbsNOp3XlxUhY2/Um7SflcWn+veXY7aO0ryJZjCD6MGbmtdhh/fOTuJbPkLk hTokZfZZkmAGhg7aLeX8gNK7xTLHoJ1SheYVSU3gXMlOXzIKXSKfwfUU2opc4oCP MUzHABsupCNMxElMCXvnCuA8UMh2e9Rrww53LQlxD6HEZ3fF2JCqYeTz7ddhyKAw yDQPBTStT5d7sIfsNPZyhZS0iuh7axvRbLLhE3QBfMxnLXWWoICeEwe3KwsvlSiJ pUqxMZJvcfOerfJj6WSBK0F2VQRyX+YmeL2GVfHWT8EaUZH7uf6ONB4WUjq/HNff JrfyaGf9guzubQf1Dfbf =V9+c -----END PGP SIGNATURE----- --R+Rs1qz93vBJxC1z--