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 F067DC433EF for ; Wed, 24 Nov 2021 13:31:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350205AbhKXNea (ORCPT ); Wed, 24 Nov 2021 08:34:30 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:57784 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348849AbhKXNcw (ORCPT ); Wed, 24 Nov 2021 08:32:52 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1637760582; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xRYVWJ0dHQQi9iTSKLYm90ofCR3wC6pwccxUaAf29nM=; b=e10UOt4SaPoLD4eM0jQWBkL/2kDJAxgYofP1YvwjUa5w23ZIK6twqvV5qLhddHIwW1BYff vK/5rL58lqIINjlqhlvzscN22jIliF7g6lAzXNsQivaZ+eKWqYQWzpshzf+ONe2OUBZhVk PIrLMlDQe/LLDbMvMkGokXypBA1TFCY= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-154-t_mLWjOnNMS33iDmJx_tmQ-1; Wed, 24 Nov 2021 08:29:41 -0500 X-MC-Unique: t_mLWjOnNMS33iDmJx_tmQ-1 Received: by mail-wm1-f71.google.com with SMTP id m14-20020a05600c3b0e00b0033308dcc933so1445458wms.7 for ; Wed, 24 Nov 2021 05:29:41 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:organization:in-reply-to :content-transfer-encoding; bh=xRYVWJ0dHQQi9iTSKLYm90ofCR3wC6pwccxUaAf29nM=; b=Jc5imY1CRlNTeQ+i8+WQDkesogiTKWqBqQnzDv+uKqzz4gGA5me6CmlNVImSQRCKA1 ddWIv+3+yG05aAcTfKBZtuMlrYzutiIpA+MIm306qZZvUu2WMdhWZPP52X7gcvmW81Ka qOdsk7Vu3676S/ccS4+2L0jGLSYqvBMxIQwjRcaZTw1qDVapgtPy+91MJeTK64zE613l ZeJX1pXwPfUJVZ3iyfi/UoKUpLr/SE0BofX9cY6OzA5+dlye4to8UC8tOxa+vlvyvOSX 9P7R4AKP5NpM3+1MjLSzbQSRgtgzeX389zxrxU0NNbR6MOufYsxV5Of5S4l26wNmo+vk cEpg== X-Gm-Message-State: AOAM531ODbsQQikHp1kqLDNyj2fd6LxRr700yMNaO/hxEmSMFAxmcvy8 kRRLfbgdN4O/lvbOMNroNIvbmrPoNKALKWNo1J7doz4DJCAm4KRN8uZa4KKxDyE/Gz1mL81uXOY rYmeVELeafAKXwhbEdWw= X-Received: by 2002:a05:600c:4113:: with SMTP id j19mr15740520wmi.48.1637760580117; Wed, 24 Nov 2021 05:29:40 -0800 (PST) X-Google-Smtp-Source: ABdhPJx78FKob78W4FbekErBlR8gszY218GTBoVGEEbXRoGoGY1c2BBkA3PDkq8LVS5+AsJnhYARCQ== X-Received: by 2002:a05:600c:4113:: with SMTP id j19mr15740485wmi.48.1637760579921; Wed, 24 Nov 2021 05:29:39 -0800 (PST) Received: from [192.168.3.132] (p5b0c6380.dip0.t-ipconnect.de. [91.12.99.128]) by smtp.gmail.com with ESMTPSA id j40sm5638552wms.16.2021.11.24.05.29.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 24 Nov 2021 05:29:39 -0800 (PST) Message-ID: Date: Wed, 24 Nov 2021 14:29:38 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: [PATCH] Increase default MLOCK_LIMIT to 8 MiB Content-Language: en-US To: Jason Gunthorpe Cc: Vlastimil Babka , Jens Axboe , Andrew Dona-Couch , Andrew Morton , Drew DeVault , Ammar Faizi , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, io_uring Mailing List , Pavel Begunkov , linux-mm@kvack.org References: <20211123132523.GA5112@ziepe.ca> <10ccf01b-f13a-d626-beba-cbee70770cf1@redhat.com> <20211123140709.GB5112@ziepe.ca> <20211123170056.GC5112@ziepe.ca> <20211123235953.GF5112@ziepe.ca> <2adca04f-92e1-5f99-6094-5fac66a22a77@redhat.com> <20211124132353.GG5112@ziepe.ca> <20211124132842.GH5112@ziepe.ca> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20211124132842.GH5112@ziepe.ca> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 24.11.21 14:28, Jason Gunthorpe wrote: > On Wed, Nov 24, 2021 at 02:25:09PM +0100, David Hildenbrand wrote: >> On 24.11.21 14:23, Jason Gunthorpe wrote: >>> On Wed, Nov 24, 2021 at 09:57:32AM +0100, David Hildenbrand wrote: >>> >>>> Unfortunately it will only be a band aid AFAIU. I can rewrite my >>>> reproducer fairly easily to pin the whole 2M range first, pin a second >>>> time only a single page, and then unpin the 2M range, resulting in the >>>> very same way to block THP. (I can block some THP less because I always >>>> need the possibility to memlock 2M first, though). >>> >>> Oh! >>> >>> The issue is GUP always pins an entire compound, no matter how little >>> the user requests. >> >> That's a different issue. I make sure to split the compound page before >> pinning anything :) > > ?? Where is that done in GUP? It's done in my reproducer manually. -- Thanks, David / dhildenb