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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 205A1C433E0 for ; Sat, 30 Jan 2021 23:21:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7E2DF64E0A for ; Sat, 30 Jan 2021 23:21:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7E2DF64E0A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=colorremedies.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1116F6B0005; Sat, 30 Jan 2021 18:21:27 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 09A836B0006; Sat, 30 Jan 2021 18:21:27 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EA3C26B006C; Sat, 30 Jan 2021 18:21:26 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0108.hostedemail.com [216.40.44.108]) by kanga.kvack.org (Postfix) with ESMTP id D24B26B0005 for ; Sat, 30 Jan 2021 18:21:26 -0500 (EST) Received: from smtpin14.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 972F18249980 for ; Sat, 30 Jan 2021 23:21:26 +0000 (UTC) X-FDA: 77764014972.14.balls47_480f4c2275b4 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin14.hostedemail.com (Postfix) with ESMTP id 7C02A18229835 for ; Sat, 30 Jan 2021 23:21:26 +0000 (UTC) X-HE-Tag: balls47_480f4c2275b4 X-Filterd-Recvd-Size: 3177 Received: from mail-wr1-f47.google.com (mail-wr1-f47.google.com [209.85.221.47]) by imf34.hostedemail.com (Postfix) with ESMTP for ; Sat, 30 Jan 2021 23:21:25 +0000 (UTC) Received: by mail-wr1-f47.google.com with SMTP id z6so12553980wrq.10 for ; Sat, 30 Jan 2021 15:21:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=colorremedies-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=OC4ffUhWXICHvvOPK+mi5sqP/nRjxhHfCizuhIBQGoI=; b=FKP/Enwu3r11LTJNN0Pm/5VClK4QGeQ8EZLspw0yHO7dZY5vTN6uey8MV09Jf9lVSE 8/cUw1Fmh/LnNYzgATmPgq+8fupM1uxMH5B03wfDG5Wh3FcH/Kd2mfDNTVuh6i2hZ/mH cGJJ2CtJE1a80lpM5Q0ZOn7RL65BQzICRM6UL9wZDF5du5m+EkwO4yYhnd3MfsnXvRCL bWTnmGtSXgao7JW8dc+QQaHJm+KV9y2SNBwj6FrtJinNjMhaGIsjxFTvGpunM3epO0PW Ya8ucmLcVJyJC9p7b/MPb5iEehY+NouRPhSFoAEU4hRv/MonADhkLHKmuNfwFikWeUvX +m3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=OC4ffUhWXICHvvOPK+mi5sqP/nRjxhHfCizuhIBQGoI=; b=royd3JZRSAg911JRFklCRKZlaSmU74MuXpwLMeCzSsiCLfa/X3WXcZdphAzTcWFOsk AksKXspaSeyc95uLhCREtPHIYiYlhNmZ6kGx6OfezrgmELI5S8E6mski8aT7e4KHG92M Wchq1jUV1USn+Q+sWlFAbwH0OhlONsnQPBTNWQXaFjRROpKrZTJahOQPxnqShhGCaCKI fZS9pcNYwPn69Kn7z1gSNaG2krm40y7QX9uoFu9BpvPhMW8zExUdj+iwZydr8OH5pBOx A2TKNO3hEO7bqZ5Pr0QDhos+1GU89SQOzR8eVY3+8KhCeUXABZQuW3dkwkjBhkkdyT0p nsdw== X-Gm-Message-State: AOAM532UwsTzJVSS5E8tCvcyoqILkZuZCn67plF1lSTrWxPGFrGuiUMq 2U4+FEeHMzYzU6W8L2eZ78wfSkFYgIh2RePzJAgyvA== X-Google-Smtp-Source: ABdhPJzQ/1b3HT+Xj7m8mMm4q0ahR8t9MdzvRNJWjo+4gqNQDvd4EeLDRBwCTQahZWSgrfXGeY/MtFCCX+nBsU+7F7U= X-Received: by 2002:a5d:6a45:: with SMTP id t5mr11004846wrw.252.1612048884820; Sat, 30 Jan 2021 15:21:24 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Chris Murphy Date: Sat, 30 Jan 2021 16:21:08 -0700 Message-ID: Subject: Re: 5.11 "debug" missing 20-30% memory, and exceptionally high reserved To: Chris Murphy Cc: Linux Memory Management List Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.035273, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, Jan 30, 2021 at 11:48 AM Chris Murphy wrote: > Bug 1921923 - Kernel under-reporting or hiding about a third of > available memory in "debug" 5.11 series > https://bugzilla.redhat.com/show_bug.cgi?id=1921923 Looks like it's newy enabled CONFIG_KASAN options. The issue doesn't happen when these are disabled: -CONFIG_KASAN_SHADOW_OFFSET=0xdffffc0000000000 -CONFIG_KASAN=y -CONFIG_KASAN_GENERIC=y -CONFIG_KASAN_INLINE=y -CONFIG_KASAN_STACK=1 -CONFIG_KASAN_VMALLOC=y -- Chris Murphy