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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C5E8CC433EF for ; Mon, 3 Jan 2022 13:53:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232168AbiACNxp (ORCPT ); Mon, 3 Jan 2022 08:53:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229531AbiACNxo (ORCPT ); Mon, 3 Jan 2022 08:53:44 -0500 Received: from mail-lj1-x22c.google.com (mail-lj1-x22c.google.com [IPv6:2a00:1450:4864:20::22c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67AB6C061761 for ; Mon, 3 Jan 2022 05:53:44 -0800 (PST) Received: by mail-lj1-x22c.google.com with SMTP id q8so40158385ljp.9 for ; Mon, 03 Jan 2022 05:53:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20210112.gappssmtp.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=6MTSM0tUGvNPWHNroYDrMPHJ8+MECxnNO9mRPQwxLmc=; b=00uAyDZtYRScRscyI8ZuMA/kYZ63Szx7eQk1dv4Y6C3AZcdesqT277Cw/mRscCh2ed l5oQlQLYFEWMPCA8EWiSix08hxah9GOyqn9TwMcbnu6vrs5RIbXWmrWcijs3/LEK/7ZA u5a0k2oe5MjqwGQaFLQpT4HN6KDmjx6Yn6/8FzAnhn0IZkTJQxB21TdPADYn3ZEDFRFp QnlmoMSEdv+G6jEQTurSWUMJNfrfJYf8R/IO8rSkzIAwLUI2e2aMiK4NE/PryBOfhPYE bjU2+fYXyiXdTiRxexQatobAjtLo+JpbPkg3bnM22i+H/MBRUx4N3/Pp/OG2VIyPmVCj kYBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=6MTSM0tUGvNPWHNroYDrMPHJ8+MECxnNO9mRPQwxLmc=; b=SJxiwywFJWVo4zvDvkPQBV8gN/fcperOqRKLcUP30esyQYI3I26aNPQx2yn93w/hUY Wky2J8VcVG/td50wvueC7MEKzn6xAZ08vHERkWgmOJGcXx7jMMo+TYfyNcWoyLS32PbA 1Q3BKQBkJsScftJ2u0+BWuL23RogLiik/OG+MFsa1Kxru58ZMPrThJCJgkUx289/WnwI cJnh5UYao2URhRYpCXi0fHvvXVD1ApO36bwSWkpxGXZvwPZTtlDdUf/HtiL7Zgs6F9Wf ZnUX656s3XkTicMqIYRk7oiPJsQdp+lu4Dxf0wUiF1aiLkh3NYHMZjVurGFHNd6UyEIU eaJQ== X-Gm-Message-State: AOAM533QUKUUYs6ZJluhwMUnO2OmnBmYHnwhJmD2T/rsUrhwbsYOaw1l RvpEnpBibo/qRj4NciEQ4u7Ixg== X-Google-Smtp-Source: ABdhPJxqygORPBLOI6WnWvHPQloq/mJxVbJDAReb+F0fiB99BHp6nev1baIgrPJcX3YbI5wPds9lUA== X-Received: by 2002:a05:651c:204b:: with SMTP id t11mr35902695ljo.94.1641218022559; Mon, 03 Jan 2022 05:53:42 -0800 (PST) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id c4sm3635249lfm.160.2022.01.03.05.53.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Jan 2022 05:53:42 -0800 (PST) Received: by box.localdomain (Postfix, from userid 1000) id 1488110443C; Mon, 3 Jan 2022 16:54:00 +0300 (+03) Date: Mon, 3 Jan 2022 16:54:00 +0300 From: "Kirill A. Shutemov" To: Ingo Molnar Cc: Linus Torvalds , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Andrew Morton , Peter Zijlstra , Thomas Gleixner , Greg Kroah-Hartman , "David S. Miller" , Ard Biesheuvel , Josh Poimboeuf , Jonathan Corbet , Al Viro Subject: Re: [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Message-ID: <20220103135400.4p5ezn3ntgpefuan@box.shutemov.name> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jan 02, 2022 at 10:57:35PM +0100, Ingo Molnar wrote: > - As to testing & runtime behavior: while all of these patches are > intended to be bug-free, I did find a couple of semi-bugs in the kernel > where a specific order of headers guaranteed a particular code > generation outcome - and if that header order was disturbed, the kernel > would silently break and fail to boot ... Looks like you are doing a lot of uninlining. Do you see any runtime performance degradation with the patchset? -- Kirill A. Shutemov