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=-4.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 0D962C433E0 for ; Mon, 25 Jan 2021 20:34:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C5D0A216FD for ; Mon, 25 Jan 2021 20:34:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732168AbhAYUd7 (ORCPT ); Mon, 25 Jan 2021 15:33:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39502 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732269AbhAYUdY (ORCPT ); Mon, 25 Jan 2021 15:33:24 -0500 Received: from mail-qv1-xf2f.google.com (mail-qv1-xf2f.google.com [IPv6:2607:f8b0:4864:20::f2f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2013C061573 for ; Mon, 25 Jan 2021 12:32:29 -0800 (PST) Received: by mail-qv1-xf2f.google.com with SMTP id a1so6817355qvd.13 for ; Mon, 25 Jan 2021 12:32:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=mIwQuMBHka7gokpbJ5MIBj9FnPmCdt3O6QrbAG8k0HA=; b=L+SrTmGx1a32S6BmbmN6EB1+MJP4SexQUa3GG6ckuFkYGGGP+8CUH1IP1zM9V2ne/z XiSzgjQfRz4pRWpCOJFng+ypTkrYPQeq9tbU3SehKZ1wT3kDb93iFpJIvqPQnLNq4GL8 D6mzacXnXZYq1ikinYsaRwOqzUu6IWm8WrCPOysU45W4EoZNk9j1o878CIdtWsIzDpiE Vw0CczRotj4Hw/IRD/mD8PLFzVVbbMx1EWi9mi4ySrLtsMW0YBXmcmxVoZZPy72vFIBi TOgDwaRm+qDhm1snpRA4YcTFJQw/jJEIIUttlZ6OkiXH+Yp6EJjLranlX/Gi3JjoocV1 20+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=mIwQuMBHka7gokpbJ5MIBj9FnPmCdt3O6QrbAG8k0HA=; b=PO5WETxGag/r5jeLEYpCghWahVDgzo/1bM0xUxAFBQvp7Kjx5GvMiZgm26zkAeVFWN RSTmbHfc80gbTiQu6KCx7t9a+pNIkNC+OcvoSShXhit547bECvnfjouDU1jNJctm3ubk 06FpRQcKMd1QD9fzoOfs1cl45R252OgiA6lqUU36PLQNr7/yBT5o5yHjMioTzIdotcZp V3iCvbGgv55fb+Ms3ncX7wA3ElkdcO6AC+4vz6hWsc2sJSDvwQOIZy0+7Z8TKy+EIn0/ ALyYrfJ9Fx0eVdAra0GZhg1b7jaui5nxZ0oLnPDkZsKiBp42nh9YxXhDEQmGIDehokFm It9g== X-Gm-Message-State: AOAM533iV8q/L3fesvD5gYg6ct0oBeTEoA6SzcO3FMkvATG6XdQ5yR5k 3ySKKEJlC7gbbCvTYZmKidg= X-Google-Smtp-Source: ABdhPJxzM+5/1kdRPBOEGm/nz15p9YtqXPoaI2oTmlAFRnXoZl4k+smbki10+SiXkQPJFp5lT9sgvg== X-Received: by 2002:a0c:bf12:: with SMTP id m18mr2557411qvi.40.1611606748796; Mon, 25 Jan 2021 12:32:28 -0800 (PST) Received: from localhost (dhcp-6c-ae-f6-dc-d8-61.cpe.echoes.net. [72.28.8.195]) by smtp.gmail.com with ESMTPSA id l35sm6579161qtd.90.2021.01.25.12.32.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Jan 2021 12:32:28 -0800 (PST) Sender: Tejun Heo Date: Mon, 25 Jan 2021 15:32:29 -0500 From: Tejun Heo To: Dave Hansen Cc: Saravanan D , x86@kernel.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org, kernel-team@fb.com Subject: Re: [PATCH] x86/mm: Tracking linear mapping split events since boot Message-ID: References: <30752f8e-16e9-d093-e6ec-31fd45715e9d@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <30752f8e-16e9-d093-e6ec-31fd45715e9d@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Mon, Jan 25, 2021 at 12:15:51PM -0800, Dave Hansen wrote: > > DirectMap4k: 3505112 kB > > DirectMap2M: 19464192 kB > > DirectMap1G: 12582912 kB > > DirectMap2MSplits: 1705 > > DirectMap1GSplits: 20 > > This seems much more like something we'd want in /proc/vmstat or as a > tracepoint than meminfo. A tracepoint would be especially nice because > the trace buffer could actually be examined if an admin finds an > excessive number of these. Adding a TP sure can be helpful but I'm not sure how that'd make counters unnecessary given that the accumulated number of events since boot is what matters. Thanks. -- tejun