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=-4.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 131EAC4727F for ; Wed, 30 Sep 2020 10:44:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C09172074A for ; Wed, 30 Sep 2020 10:44:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="lmuRNBBJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728676AbgI3KoK (ORCPT ); Wed, 30 Sep 2020 06:44:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725779AbgI3KoJ (ORCPT ); Wed, 30 Sep 2020 06:44:09 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 163FDC061755; Wed, 30 Sep 2020 03:44:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=5qZQjs1EsA6boevvDA9SSd2z5d4qbdVT+hJQw1G/0sA=; b=lmuRNBBJk1jt8rrS9q/PkAhZuG fIzl2JL+dfOhTfqi4qYpOXkOTWYgdR39HrKy+8qBSsHCzFUSr8Hbxvdnkpd6E31zUVmcvLq+NQQKR Km30qLapukE1XiWNMZYMwvSGoygMffiap4x5lbx9lgZq4Hnrxnm6rchZSVISeJ59yIac7RQbn0luB bmOV0s5w4LtQIfeHyEhfyrF1DZLlA2g81NZcHjR4G3OqgBHVZBs3y5vjhZl5424UOd073D6LaCNgz 68atLfVY8PEoJv37EsSaHNcu4ERIGnpJARBoGgq9+unozcIKEkW6uHN3Bt1Rs8lI0jogsaCMfl1qu mpna8MXg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kNZaJ-0002EU-BE; Wed, 30 Sep 2020 10:43:43 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id E04C5300446; Wed, 30 Sep 2020 12:43:39 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id C7F922022B66B; Wed, 30 Sep 2020 12:43:39 +0200 (CEST) Date: Wed, 30 Sep 2020 12:43:39 +0200 From: Peter Zijlstra To: Mike Rapoport Cc: Andrew Morton , Alexander Viro , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dan Williams , Dave Hansen , David Hildenbrand , Elena Reshetova , "H. Peter Anvin" , Idan Yaniv , Ingo Molnar , James Bottomley , "Kirill A. Shutemov" , Matthew Wilcox , Mark Rutland , Mike Rapoport , Michael Kerrisk , Palmer Dabbelt , Paul Walmsley , Thomas Gleixner , Shuah Khan , Tycho Andersen , Will Deacon , linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org, songliubraving@fb.com Subject: Re: [PATCH v6 5/6] mm: secretmem: use PMD-size pages to amortize direct map fragmentation Message-ID: <20200930104339.GK2611@hirez.programming.kicks-ass.net> References: <20200924132904.1391-1-rppt@kernel.org> <20200924132904.1391-6-rppt@kernel.org> <20200925074125.GQ2628@hirez.programming.kicks-ass.net> <20200929130529.GE2142832@kernel.org> <20200929141216.GO2628@hirez.programming.kicks-ass.net> <20200930102031.GJ2142832@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200930102031.GJ2142832@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On Wed, Sep 30, 2020 at 01:20:31PM +0300, Mike Rapoport wrote: > I tried to dig the regression report in the mailing list, and the best I > could find is > > https://lore.kernel.org/lkml/20190823052335.572133-1-songliubraving@fb.com/ > > which does not mention the actual performance regression but it only > complaints about kernel text mapping being split into 4K pages. > > Any chance you have the regression report handy? I think the saga started here: 20190820075128.2912224-1-songliubraving@fb.com 20190820202314.1083149-1-songliubraving@fb.com 20190823052335.572133-1-songliubraving@fb.com After that Thomas did the patch I referred to earlier and I endeavoured to rewrite x86-ftrace. I added Song to CC, maybe he can remember more.