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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 570E6C433F5 for ; Mon, 6 Dec 2021 14:56:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CD7D46B006C; Mon, 6 Dec 2021 09:56:03 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C878E6B007D; Mon, 6 Dec 2021 09:56:03 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B50A36B007E; Mon, 6 Dec 2021 09:56:03 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0200.hostedemail.com [216.40.44.200]) by kanga.kvack.org (Postfix) with ESMTP id A69536B006C for ; Mon, 6 Dec 2021 09:56:03 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 6EA42180D079F for ; Mon, 6 Dec 2021 14:55:53 +0000 (UTC) X-FDA: 78887668986.09.B00E732 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) by imf31.hostedemail.com (Postfix) with ESMTP id 266361046306 for ; Mon, 6 Dec 2021 14:55:52 +0000 (UTC) Received: by mail-pl1-f172.google.com with SMTP id q17so7200686plr.11 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=mRD3DiIMw+2ldTltemAai9RX9eOmMflKMz8mEqjgJDPo4IgnFAuYTroZuEnH39zLpu nxYInHIb5Zk30EM5Ib2Iqyo7qcvoUX7dn/3W8oOfcuEekT+hZss04GChDibFtHgm0XS0 yN8eE14orZLJrNv7U8zF5rnD+oAhOinqwEB3nLAusEl+/PH05BI9xgPGlK+8c8RowCD0 9jeD7ve42qHCFxF/rXgfIUTccX5Acje26yZDHh46Pe/7vZK2bEsjU9C8NtQs9/Dvh7k9 GgTJWfDVN8lvUBLLUXOz49MxKG68NrYr2FWenx/ot3tShEyG4I0rmKYsQOglXincvSRi 8RCw== X-Gm-Message-State: AOAM531D2p50Sw0C1ZUOKrQTKpYHfZmGPLb3qAtzIuIiSLfLTLEhfhUZ R7mJSf0Udd+J5ns2C23Uuv0= 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 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 266361046306 X-Stat-Signature: czs8zxak7b3tj38a7wexw86iy443p1cq Authentication-Results: imf31.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Iks6yavB; spf=pass (imf31.hostedemail.com: domain of xf2017140389@gmail.com designates 209.85.214.172 as permitted sender) smtp.mailfrom=xf2017140389@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-HE-Tag: 1638802552-356678 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000031, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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