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 328F8C636CC for ; Thu, 16 Feb 2023 05:21:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229702AbjBPFVA (ORCPT ); Thu, 16 Feb 2023 00:21:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229685AbjBPFT6 (ORCPT ); Thu, 16 Feb 2023 00:19:58 -0500 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E063E47432 for ; Wed, 15 Feb 2023 21:19:02 -0800 (PST) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-4bdeb1bbeafso8706637b3.4 for ; Wed, 15 Feb 2023 21:19:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=+haucx/0aUjNKP4B5JYWnKqFhX48IZcct98M2E1/jbw=; b=aDErRd7kkY+Kp4AaU6gjM3F503YHpBTPjjocmaNoc4zXVCAuMI2RAQKjzcRAbLtJge uySjaOCoHcGS53W7o3RYdOQoeaAfeHvH08PuG1fh1bxXWOGZDVGDBlzIfGuJz8kR8m0P 4LCu9IW21ZFA5+XCq7hXP9c4LIZtK/mDOJpY3r8EhzjVEo7Ti1XlFspuAz3gf99Vo08U GQhyt4xy4/c9ROtLln2G8n+ixCeeiCqz1U0tO8VqF1k+R16fVXyhOw17lx8zHct64i1Z f89mO/K5qgtX3vlh4Aty7U18axNicxnQBp8nhqlTIla4iaOnphrb06qKzWIf+oeLlfcz N8gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=+haucx/0aUjNKP4B5JYWnKqFhX48IZcct98M2E1/jbw=; b=vXvJ/jmmr8cilTQtDwSdBP8CsN/q9SuLvltAFG8UvI2R0R5hMj+Kq6MUK6SkLZ53Rt XcyyIW9gpU+L5xxQsTfhd77ZxzcOJ4JCdSiHVivWPLbF4A/R8zx9QlWWQlXf/d5VoF8a FgvXXwo66wc2uvZMqNgZO+Fxpqa1D6WmNPYbSqW9EoxmUWr/Jx+F050nEj4kIbB5eTMs LvxnN7MXQO1maObCExB10pge0LyvHy5kMnEqiJThAvyYqngbH83isJTwbCRMEnx4fk86 ya2dLL8+euGIVAtNNEy49vl+fp3ZPK2NEOkrp6XiegjNLcvJAnw3kAFjeNGwH4+e4lrw 4URA== X-Gm-Message-State: AO0yUKVGFbz20h6ipSOryVd1Dya+CyG7oDRmF5XfadjTFb1sSyrg8vvY n5ibRy+z0ce2YWQNEBbuQZIutRIB6BQ= X-Google-Smtp-Source: AK7set9hR8JRk82RlKZHeYCMxCYi1ok7+igo70HcdJvHzw/Nn50rv4GE5Ev7Sgo0D41w7o23DTD5b6roJhQ= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:f781:d5ed:1806:6ebb]) (user=surenb job=sendgmr) by 2002:a5b:c41:0:b0:91d:ddda:665f with SMTP id d1-20020a5b0c41000000b0091dddda665fmr396601ybr.589.1676524741694; Wed, 15 Feb 2023 21:19:01 -0800 (PST) Date: Wed, 15 Feb 2023 21:17:43 -0800 In-Reply-To: <20230216051750.3125598-1-surenb@google.com> Mime-Version: 1.0 References: <20230216051750.3125598-1-surenb@google.com> X-Mailer: git-send-email 2.39.1.581.gbfd45094c4-goog Message-ID: <20230216051750.3125598-29-surenb@google.com> Subject: [PATCH v3 28/35] mm: prevent do_swap_page from handling page faults under VMA lock From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, paulmck@kernel.org, mingo@redhat.com, will@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, chriscli@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, rppt@kernel.org, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, leewalsh@google.com, posk@google.com, michalechner92@googlemail.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com, Suren Baghdasaryan , Laurent Dufour Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Due to the possibility of do_swap_page dropping mmap_lock, abort fault handling under VMA lock and retry holding mmap_lock. This can be handled more gracefully in the future. Signed-off-by: Suren Baghdasaryan Reviewed-by: Laurent Dufour --- mm/memory.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index 13369ff15ec1..555612d153ad 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3688,6 +3688,11 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) if (!pte_unmap_same(vmf)) goto out; + if (vmf->flags & FAULT_FLAG_VMA_LOCK) { + ret = VM_FAULT_RETRY; + goto out; + } + entry = pte_to_swp_entry(vmf->orig_pte); if (unlikely(non_swap_entry(entry))) { if (is_migration_entry(entry)) { -- 2.39.1