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=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 5ABEAC3524D for ; Mon, 3 Feb 2020 13:46:22 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 19EBC207E0 for ; Mon, 3 Feb 2020 13:46:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="XDZxoHhC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 19EBC207E0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=shutemov.name Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BE3E76B065A; Mon, 3 Feb 2020 08:46:21 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BBB226B065B; Mon, 3 Feb 2020 08:46:21 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AD1C26B065C; Mon, 3 Feb 2020 08:46:21 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0074.hostedemail.com [216.40.44.74]) by kanga.kvack.org (Postfix) with ESMTP id 954F76B065A for ; Mon, 3 Feb 2020 08:46:21 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 4C9D02DFC for ; Mon, 3 Feb 2020 13:46:21 +0000 (UTC) X-FDA: 76448940162.12.mark88_5483af6af2337 X-HE-Tag: mark88_5483af6af2337 X-Filterd-Recvd-Size: 4440 Received: from mail-lj1-f193.google.com (mail-lj1-f193.google.com [209.85.208.193]) by imf22.hostedemail.com (Postfix) with ESMTP for ; Mon, 3 Feb 2020 13:46:20 +0000 (UTC) Received: by mail-lj1-f193.google.com with SMTP id n18so14665625ljo.7 for ; Mon, 03 Feb 2020 05:46:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=tU9tK10SJbC8EDc1nwVApy1mZDrqz45FwFA9axqWA50=; b=XDZxoHhCcK/pGBTHQTPXfmvtfOmM8Qx8aZuUUNp8bBh+ABwsHj6XiY+mvVsbwnG+WK J+h9pC9u5JxzLXhuxudUIFZCRY7iVP8GEtrBuMhhajKY2VbUmsOAJOiCHqHSLIAFMP+h BAR615hNSp5oNHhpaCb492STJsM7SDPqgTMXh/tEeok0wkcP1Ylg+iooZ4gFg8q/Y7Ce HNnXYnWiHsb9v+nFvr/4j0fP3Q9jM4aQgAgHSRau7HUOJrbvHT/VgtzDJn+TmhgIQoP9 uWYcKYY23Qm56Gdf0De+1ri647PIXY1Br8V0GjmteuTNK7fWj+kV0lWWF0XQYzAPYtEh nPVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=tU9tK10SJbC8EDc1nwVApy1mZDrqz45FwFA9axqWA50=; b=OB0ikhq7jJsLRRqx2bGdahVekxLjj0rEk4SSfDjNepvaC98HVc8LRx4z4BZikxOJOV BEqZs94ZG8rJ2u362kiyKlkZyFBzLjVUPYTzgVvZ79/C0DLQMP3s18FQYZt2iWTlKi17 VGG+tTSii3O/FiqV6feX9KQqcctG0hUemY2rXuSDXrbbQKNo8mbLO7isgPyWd0RHsfea J3ne8kJxUW5ncBvEfrpiktu5NbyzviJgFEK9hEyZ2A5EE0ZgoV9peepAkIZ6KrNWjf8N JjKa+kCttF8Ds9R47IhhmEYCeuQXXUjYm+L9wjRRovB4MKO7Kditsi9hnbXJiqPtpJKe vsTw== X-Gm-Message-State: APjAAAVgmTkXF2bO4rZ3+dKkY2zTD2xVDEtCJwTcZdhzR5FEim80Zmt3 FOzFXfA5vuFA88dHu03XCeWvvw== X-Google-Smtp-Source: APXvYqyy6A/WwKqfelaaFFwhQh2rUZje06Y/Uu8QUR0CaG7TohoxG9uxfSDbuo3RreSYZYQDJJrQ4Q== X-Received: by 2002:a2e:8758:: with SMTP id q24mr14214187ljj.157.1580737579039; Mon, 03 Feb 2020 05:46:19 -0800 (PST) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id q16sm8810732lfa.12.2020.02.03.05.46.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Feb 2020 05:46:18 -0800 (PST) Received: by box.localdomain (Postfix, from userid 1000) id D207B100DC8; Mon, 3 Feb 2020 16:46:29 +0300 (+03) Date: Mon, 3 Feb 2020 16:46:29 +0300 From: "Kirill A. Shutemov" To: John Hubbard Cc: Andrew Morton , Al Viro , Christoph Hellwig , Dan Williams , Dave Chinner , Ira Weiny , Jan Kara , Jason Gunthorpe , Jonathan Corbet , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Michal Hocko , Mike Kravetz , Shuah Khan , Vlastimil Babka , Matthew Wilcox , linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-rdma@vger.kernel.org, linux-mm@kvack.org, LKML Subject: Re: [PATCH v3 09/12] mm: dump_page(): better diagnostics for huge pinned pages Message-ID: <20200203134629.qxkgsso5kksb3ljj@box> References: <20200201034029.4063170-1-jhubbard@nvidia.com> <20200201034029.4063170-10-jhubbard@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200201034029.4063170-10-jhubbard@nvidia.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jan 31, 2020 at 07:40:26PM -0800, John Hubbard wrote: > As part of pin_user_pages() and related API calls, pages are > "dma-pinned". For the case of compound pages of order > 1, the per-page > accounting of dma pins is accomplished via the 3rd struct page in the > compound page. In order to support debugging of any pin_user_pages()- > related problems, enhance dump_page() so as to report the pin count > in that case. > > Documentation/core-api/pin_user_pages.rst is also updated accordingly. > > Signed-off-by: John Hubbard Acked-by: Kirill A. Shutemov -- Kirill A. Shutemov