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 8B27FC433F5 for ; Mon, 6 Dec 2021 14:55:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344757AbhLFO7W (ORCPT ); Mon, 6 Dec 2021 09:59:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343709AbhLFO7V (ORCPT ); Mon, 6 Dec 2021 09:59:21 -0500 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69B72C061746 for ; Mon, 6 Dec 2021 06:55:52 -0800 (PST) Received: by mail-pl1-x630.google.com with SMTP id n8so7225333plf.4 for ; Mon, 06 Dec 2021 06:55:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id; bh=emz0kTddmhcEiWiR/ZQaPHErMqrIjWnJCX7XLC9vu60=; b=Iks6yavBR1J/nZdiCyht+KoWmGtn4HqcF6QXBsSBWdlkjDeMuMNzd3wle93jiVcD4p ltPqH9H4JneRJJPl6bcDyqWf/cDdCCc5XTRXFr9yLp4xW3h/yVtvByb3B97ylWT/nXai yhR1Sp3qpMW/Kq9knOL28ZsJSO4eKanKkkA6tpyGVn1/4Mic9CpiIUZZQxofGlOFXbRi oZuhGJYhxGu8Vd1J1Ch6uk1z18Z/ldKo4uonUhhWHiq+XVizvsK80+vbtCDRWFUjWpKX wElP31fU/kNmwi6S4Gar0/w2dtjKIOeUnQGAgWAZn8wWwVZTNsk/ICROjxzfS+KK5Zi/ jqwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=emz0kTddmhcEiWiR/ZQaPHErMqrIjWnJCX7XLC9vu60=; b=PX5OoAxTRGG+D5oLsclXBBwXtgfUhYplkASOuXTPOJGsjL+LrvKeBTDdaopIkE/TX9 aenmSeLOkpIpj0OEi/It+iwe8YR4jp8kmJB9Z5FU8c6iFo2gpIs9K4vUpPmloL4XGn93 aSWDRay+HGfAWNfvFjFzy3Iil1GkD2bB5Vg4wx+kX8QI9aPNnBq4GaTI0ZqVKUCF7CES 9o3k6wFNhZwiPWI2KxDC9vRCz6HOCc3WmG7AIzwsExOZWgxCLS2tBR7HBG1AmDDDMlEB c3mvR4+dyy2r0utuF42uUmaaOifAhI+oZ5AKVgNLWsIvwBY6X7VJYzRUE699LKFi/I69 5J+w== X-Gm-Message-State: AOAM532BUV4OTLjV/DOYyXz97qW0wNg+7b/e2EnmsmN8A4kP6u9jYX5N bGbEuoDaeqFuBUmuML/jZMw2E4cY3pz9Ng== X-Google-Smtp-Source: ABdhPJy2HihX0YNanUIWglIygyZmlEz2hYa1AZTDv7nX6NQ0hUEFyF9dhr6UuR4Ik6TKPn/M06x96A== X-Received: by 2002:a17:90b:4d0a:: with SMTP id mw10mr38021099pjb.89.1638802552019; Mon, 06 Dec 2021 06:55:52 -0800 (PST) Received: from monster.mioffice.cn ([2408:8607:1b00:7:82e8:2cff:fed2:80d9]) by smtp.gmail.com with ESMTPSA id 130sm12395839pfu.13.2021.12.06.06.55.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Dec 2021 06:55:51 -0800 (PST) From: xf2017140389@gmail.com X-Google-Original-From: xiaofeng5@xiaomi.com To: akpm@linux-foundation.org, christian@brauner.io Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, zhangcang@xiaomi.com, wangju@xiaomi.com, fangzhirong@xiaomi.com, xiaofeng Subject: [PATCH] mm/madvise: break reclaim when lock race Date: Mon, 6 Dec 2021 22:55:16 +0800 Message-Id: <20211206145516.23760-1-xiaofeng5@xiaomi.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: xiaofeng In Android phones, the recycling thread is likely to hold the mmap_lock to reclaim the memory of the application When the top-App is switched to the background. Once the user switches the application to the top during the recycling process, there is a high possibility that the memory will be allocated due to the inability to obtain the lock, which may cause lag or other problem. Signed-off-by: xiaofeng --- mm/madvise.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/madvise.c b/mm/madvise.c index 8c927202bbe6..8f1e325873e0 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -322,6 +322,9 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd, if (fatal_signal_pending(current)) return -EINTR; + if (mmap_lock_is_contended(mm)) + return -EINTR; + #ifdef CONFIG_TRANSPARENT_HUGEPAGE if (pmd_trans_huge(*pmd)) { pmd_t orig_pmd; -- 2.17.1