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 09B66C433EF for ; Thu, 10 Feb 2022 09:02:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238178AbiBJJCV (ORCPT ); Thu, 10 Feb 2022 04:02:21 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:37660 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232598AbiBJJCU (ORCPT ); Thu, 10 Feb 2022 04:02:20 -0500 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CAD0C103B for ; Thu, 10 Feb 2022 01:02:21 -0800 (PST) Received: by mail-pf1-x429.google.com with SMTP id l19so3284681pfu.2 for ; Thu, 10 Feb 2022 01:02:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:subject:date:message-id; bh=RyMXcmrUxlp04QWvabDBbFsJJhMaqMCO3oplSNl+rTQ=; b=aLkF+h17Wqr9ZAVsc/OAh2DjU+/8OAwb7nQ1EDkqxvD6TxJRI6IyTXcm6jHYINvk8r 4kWarW/zxXH+j4g2SGqxOQHtnw1rfw2LjeYkHHOFZ2S1xgAAiOZq/bXhTc9hCAqFyQ4B TTDfkHYgRcVPe8P5G3R0o9/8zHH/ZtwawRu3j8U9ASIM8qLKgNOPFP2+RFQ0tibxGnCb TULMfwhFjsMwn/CHggR6hTIuE13YHwbfprcPEm0nHPnM4QtHfEELkjxOKDDgsqjuBdJN oH5HE4RtwR4APFOx8nnMeZQSTMLMfjlESuU9ZGurMcZJrPVy8NaiHmu1GZUNqK+R+QFJ kKgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id; bh=RyMXcmrUxlp04QWvabDBbFsJJhMaqMCO3oplSNl+rTQ=; b=JNCsDEvPbMiMs1wKcs17NFEsdhlHS9kOlLXG9exsOolsh4dTdF2Rx2CsSL3HaKysR2 E+W3/F1mFtvZLhHJQ8Tmit72WAEYtU6CrpznVsmP6+HMx2c1ENHg137m0e3nXT07+8mF E6jsGvJl9cLsjZBuutbFjuv6phaT1hPN/yJjQFn9fPazzE8FX+cg4jPC7sG9gg+DlEwI r70UOu7LE2qTCUR21kByHXKUAiFoFuflKS+Aavs979JrBX7Wd/WkjP/1Xik2uFRJS5kT ghQerDisCdhA4ZkFBOnDycbJpnt09K917ruR/MyjQjLsZ6xo19/9399AYO/jFtFdCCOV fytQ== X-Gm-Message-State: AOAM530N4lzwvPMkF9rIYl0I+lxALeVYkzj0GUKdWIxus4Uc/+n1rmce /Mu5k73kdDtcXMTYxPxYhJm7hcuykdM= X-Google-Smtp-Source: ABdhPJzuoRO/xMvCBLpBnqGP2BDYMPld/CiWnVx2cR+TvEs9MZShpo6H8uWGEVHIkfuoXbEnSO07jQ== X-Received: by 2002:a63:d07:: with SMTP id c7mr696505pgl.311.1644483741098; Thu, 10 Feb 2022 01:02:21 -0800 (PST) Received: from bj03382pcu.spreadtrum.com ([117.18.48.102]) by smtp.gmail.com with ESMTPSA id w12sm9854109pgl.64.2022.02.10.01.02.18 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Feb 2022 01:02:20 -0800 (PST) From: Huangzhaoyang To: Andrew Morton , Zhaoyang Huang , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH] mm: record context on page->mapping Date: Thu, 10 Feb 2022 17:01:55 +0800 Message-Id: <1644483715-7981-1-git-send-email-huangzhaoyang@gmail.com> X-Mailer: git-send-email 1.7.9.5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zhaoyang Huang Since page->mapping is vacant in the pages which used by kernel(drivers etc) Have it record current context to help tracking the page's owner in system memory dump. Signed-off-by: Zhaoyang Huang --- mm/page_alloc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c595274..2757d10 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2430,6 +2430,8 @@ static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags set_page_pfmemalloc(page); else clear_page_pfmemalloc(page); + + page->mapping = (struct address_space *)current; } /* -- 1.9.1