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=-18.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL 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 DC931C433ED for ; Mon, 26 Apr 2021 16:23:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A7E4D61164 for ; Mon, 26 Apr 2021 16:23:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234542AbhDZQXr (ORCPT ); Mon, 26 Apr 2021 12:23:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233919AbhDZQXm (ORCPT ); Mon, 26 Apr 2021 12:23:42 -0400 Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5338DC061574 for ; Mon, 26 Apr 2021 09:23:00 -0700 (PDT) Received: by mail-lf1-x131.google.com with SMTP id r128so62179232lff.4 for ; Mon, 26 Apr 2021 09:23:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=G1oXQ0k3C+TJ3+pK/S1RsiGeYgBqWj1N5rB2o3PFlsA=; b=BUxoyU4CiG9iUane0XR67GRpWWSdf87lIDjVSy1iIQhILWMI3zn4M9c/PriB5DLhe+ xCBtdkuK5mCMtR/TxvOM1X58GqWMn7eIjzEvaRMSdJM2B2pVV/j/QBqA/s81v/XH2oh7 wa9+RZi580kYMAhvqA+0g0+Gqy/mPDEpEA8DKQvPtgQHIHgBLOWNGb0SHSco3ZpL7RDF vZchyLvdNZxR3U+K1AHKxglHyrOtrfmpgU4FCaSnFOVrQIkSJoiLWOtUoZha4RuESPYI rUud5LZCVHgWyhQmNsjfHZUIOpPaegPtpUAYlUH+GdSOqCfMHiF5p93zVD6bCkB1Izeu tQXg== 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=G1oXQ0k3C+TJ3+pK/S1RsiGeYgBqWj1N5rB2o3PFlsA=; b=OnyXJBSjZPnlSqH3XvJ5w5L/YT7eOY6MT5TTx9Ww851q14TaoFX39SZI16bdHIZmVo /v21AHt1npH5ku/FE36CwVMSj4Wqfohav0shGR5EQG9QRRBpb66evBqVbEhxueWdz8CU wyvjk2ce0mjqkkzXWTH3IF01ekOC0Q67aLe4/MdrahcOoImmn7h4+i8CmXRWpFiWSOaT dv4Fud42CCWC0WCQO4lM7TWNd+dfcp/FRNEwov4psKDHDwIENWQpoPMZ8osluHGdfdu6 wM/E8eRclwfAx5fihLjQHPPgPp4aqCbSb5sWtPepMCahYSBlfdzzMfx5JFWozDCV/8/Z rRRg== X-Gm-Message-State: AOAM5328C70N9Qry4dUmkYwJ/+wjPNNXHHYnlmGdfFEuaGXe42Wdg1VC G723sdK7M9x7SLQEJxJ+9Fy7dsjCZ5ctwSXa3zoSOA== X-Google-Smtp-Source: ABdhPJy8zGcA/ykwOUiguxWU/qb/3p4N5X3nMypcBT7c7yygZlv8Vts+LYzyw0GJzWUDoxVPNpR0HOGw5gOFrmTZtR8= X-Received: by 2002:a05:6512:3994:: with SMTP id j20mr13410814lfu.549.1619454172306; Mon, 26 Apr 2021 09:22:52 -0700 (PDT) MIME-Version: 1.0 References: <722774d8-d46b-f8a6-a88e-3c56b4968622@virtuozzo.com> In-Reply-To: <722774d8-d46b-f8a6-a88e-3c56b4968622@virtuozzo.com> From: Shakeel Butt Date: Mon, 26 Apr 2021 09:22:41 -0700 Message-ID: Subject: Re: [PATCH 1/2] ipc sem: use kvmalloc for sem_undo allocation To: Vasily Averin Cc: Michal Hocko , Cgroups , LKML , Alexey Dobriyan , Johannes Weiner , Vladimir Davydov , Andrew Morton , Dmitry Safonov <0x7f454c46@gmail.com> Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 26, 2021 at 3:18 AM Vasily Averin wrote: > > size of sem_undo can exceed one page and with the maximum possible > nsems = 32000 it can grow up to 64Kb. Let's switch its allocation > to kvmalloc to avoid user-triggered disruptive actions like OOM killer > in case of high-order memory shortage. > > Signed-off-by: Vasily Averin Reviewed-by: Shakeel Butt