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=-20.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 735AEC433EF for ; Mon, 6 Sep 2021 15:12:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E6B2660200 for ; Mon, 6 Sep 2021 15:12:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E6B2660200 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 5D9E46B0071; Mon, 6 Sep 2021 11:12:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 58937900002; Mon, 6 Sep 2021 11:12:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 477AE6B0073; Mon, 6 Sep 2021 11:12:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0087.hostedemail.com [216.40.44.87]) by kanga.kvack.org (Postfix) with ESMTP id 38C756B0071 for ; Mon, 6 Sep 2021 11:12:01 -0400 (EDT) Received: from smtpin33.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id D349B181AEF32 for ; Mon, 6 Sep 2021 15:12:00 +0000 (UTC) X-FDA: 78557488800.33.D41E1F5 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by imf25.hostedemail.com (Postfix) with ESMTP id 69CA0B00008E for ; Mon, 6 Sep 2021 15:12:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1630941119; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sTAWUJqHsSCVJupFQIBe5xPSnSiwqkAc+Gj9oW0KiHI=; b=hCUTQ60yRDC45D5WgRhNoi6zxj68p9S256BB5o1FH0N1ssrBeUXgQrbg57VQdd8hhEiYY3 jk/5LyJDoe/P5KhvR+S2nspzyGMB1gdnhynDIi7k/bxtF9gdW+KvMpTOfPsp3Dh5XeGCC6 kxqe1XXaa7fEUxVlXL6iXmh5JQ/2K+M= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-587-FuvSENoiOLSKNhiNEYVyTA-1; Mon, 06 Sep 2021 11:11:58 -0400 X-MC-Unique: FuvSENoiOLSKNhiNEYVyTA-1 Received: by mail-wr1-f69.google.com with SMTP id b8-20020a5d5508000000b001574e8e9237so1271733wrv.16 for ; Mon, 06 Sep 2021 08:11:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:organization :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=sTAWUJqHsSCVJupFQIBe5xPSnSiwqkAc+Gj9oW0KiHI=; b=TiSDiqwNbeQPOrMEshnDfNKeZW30LYZuOrbEHUxQQKk+p7tgYNIWAYuKtjm3zq+MjX eCYc5EdrKIrrNhZVcTXF+t8fxnxJR03UTmlb44gtKnJsaK6QbiqRqeegp0arVseH1EjL d01nOVmrQncfQyJuLk1W4s4W6UyMil8SjTzlFL9IzRKZ/N9o9aZMl6x8W/k9+mn9Fr91 DEf0p2yVZrtIxh+ug3l9FivPvUd44mTBu455wU5tMS0ApzvgYLtB894oh2etI7XhMWic 3EibyGqPFXjDUtw7KcSW/KPzMo6sbPnWhdSm1TYL3lI+una81KZtuK3P423MMv1hCyL8 rtsg== X-Gm-Message-State: AOAM531LB5DkPUVz1in0UwC2aKJnIv6XcuhqVmsqt5xZRzQ1WRuXSlh6 LdIi8xbELRj2kRBnES7zZXmkcfT10WDw3CiKFS8b9VB9r4sauAcPQBZPTysgfm+4+PkOFnHaakI VO7290Y+nK3M= X-Received: by 2002:adf:eb4b:: with SMTP id u11mr14310403wrn.327.1630941117340; Mon, 06 Sep 2021 08:11:57 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyVfjP/aW0NF3LaFLZ7LNJWIHA0o4u1fJBl+7x7QDc7wVMjUPQuMjUI9qn9/xMi4h2tqzibnw== X-Received: by 2002:adf:eb4b:: with SMTP id u11mr14310385wrn.327.1630941117141; Mon, 06 Sep 2021 08:11:57 -0700 (PDT) Received: from [192.168.3.132] (p5b0c6323.dip0.t-ipconnect.de. [91.12.99.35]) by smtp.gmail.com with ESMTPSA id x21sm7498364wmi.15.2021.09.06.08.11.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Sep 2021 08:11:56 -0700 (PDT) Subject: Re: [PATCH v2] mmap_lock: Change trace and locking order To: Liam Howlett , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Andrew Morton Cc: Steven Rostedt , Michel Lespinasse , Vlastimil Babka , Matthew Wilcox References: <20210903022041.1843024-1-Liam.Howlett@oracle.com> From: David Hildenbrand Organization: Red Hat Message-ID: <2abcacff-e629-a7a0-044f-986ebfc7416d@redhat.com> Date: Mon, 6 Sep 2021 17:11:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210903022041.1843024-1-Liam.Howlett@oracle.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=hCUTQ60y; spf=none (imf25.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 69CA0B00008E X-Stat-Signature: d777n8kdar38wfpies35mero66spfzqd X-HE-Tag: 1630941120-806480 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 03.09.21 04:21, Liam Howlett wrote: > Print to the trace log before releasing the lock to avoid racing with > other trace log printers of the same lock type. > > Signed-off-by: Liam R. Howlett > Suggested-by: Steven Rostedt (VMware) > --- > include/linux/mmap_lock.h | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h > index 0540f0156f58..b179f1e3541a 100644 > --- a/include/linux/mmap_lock.h > +++ b/include/linux/mmap_lock.h > @@ -101,14 +101,14 @@ static inline bool mmap_write_trylock(struct mm_struct *mm) > > static inline void mmap_write_unlock(struct mm_struct *mm) > { > - up_write(&mm->mmap_lock); > __mmap_lock_trace_released(mm, true); > + up_write(&mm->mmap_lock); > } > > static inline void mmap_write_downgrade(struct mm_struct *mm) > { > - downgrade_write(&mm->mmap_lock); > __mmap_lock_trace_acquire_returned(mm, false, true); > + downgrade_write(&mm->mmap_lock); > } > > static inline void mmap_read_lock(struct mm_struct *mm) > @@ -140,8 +140,8 @@ static inline bool mmap_read_trylock(struct mm_struct *mm) > > static inline void mmap_read_unlock(struct mm_struct *mm) > { > - up_read(&mm->mmap_lock); > __mmap_lock_trace_released(mm, false); > + up_read(&mm->mmap_lock); > } > > static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm) > @@ -155,8 +155,8 @@ static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm) > > static inline void mmap_read_unlock_non_owner(struct mm_struct *mm) > { > - up_read_non_owner(&mm->mmap_lock); > __mmap_lock_trace_released(mm, false); > + up_read_non_owner(&mm->mmap_lock); > } > > static inline void mmap_assert_locked(struct mm_struct *mm) > Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb