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=-14.6 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_IN_DEF_DKIM_WL autolearn=no 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 70EAAC433DF for ; Fri, 14 Aug 2020 08:30:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3A1A42074D for ; Fri, 14 Aug 2020 08:30:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="dnr4mLvl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726995AbgHNIa6 (ORCPT ); Fri, 14 Aug 2020 04:30:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726903AbgHNIax (ORCPT ); Fri, 14 Aug 2020 04:30:53 -0400 Received: from mail-yb1-xb43.google.com (mail-yb1-xb43.google.com [IPv6:2607:f8b0:4864:20::b43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3582CC061385 for ; Fri, 14 Aug 2020 01:30:53 -0700 (PDT) Received: by mail-yb1-xb43.google.com with SMTP id i10so4773030ybt.11 for ; Fri, 14 Aug 2020 01:30:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=UnDVAQh+31C0t6VNGwQb4SjTxgNgsH3VtTdOtKZQqwA=; b=dnr4mLvlqaTviMNIb+lJPY5U9aWlRKE8rBtF9/XEX9gNmzomc3qYCO99SFNJMqBShI ID7CBkceR981pX1/9kqesB9Bqrrq5f2cFzFhV/5G2tyTb89F0zUk7JSbKaSZOw3HbQxf Zhq0gHvWTQCikK3g4ur3M4TmpQw/a0u37kQEwnJw81wKmuuqaGmI6H+HbLINFx15X0H+ hOIxcXOllEOoPSzsZ0DKha77TGNiwyDY0h2iYQVxky7dQScxW7AX4U4wH+U/RcYsDB4c 4QTpivy51hJ8Xe0EnMzKIsjUXatzwM8w9PRIj3RFXCY7hXh0uWmamBOgCcOWMtRYHo/u l8QQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=UnDVAQh+31C0t6VNGwQb4SjTxgNgsH3VtTdOtKZQqwA=; b=WKShxSK8L+04skPrRcAkvsHTi2TbqeMTMN+Sklg64NdnZIJQRT1j99UzXgeqXFNFqC lrcQvBiYfswkcbMEtwwHVSXy3ARBK9MHsjVuCrTB5Sr6mfAPOgJC0oXiQXC8Wp/wgg8k L+hSDrVRehQDwfJhrtXwRcUzMwKlk4hS+VapZZV8JyrkkBICSHZtSP2fd7gtcCu2f8Jr iX3oxT8WaD/2niu85dnCWYGk6UnrLv5luzyxsuUrQkZr7dqKVeZexrg4l6QFJlydSlmp RsIw8w2ElnjADTBbDYKnw3N++uiIlO3HYGdPr+L/VoTKX633XfIOe9lrGtt4FRlUF5vx V/6g== X-Gm-Message-State: AOAM5323kzexVEeyX47UAqMBEBFHlyzdxUzFtqeGUoKp+OK1tV74tNH1 lq2NzwHAzh8/AmH7zJ68BQESR0VVpPE+qZzWmlXfhg== X-Google-Smtp-Source: ABdhPJzFmN0idTb9mEjomYn0+86nKEa4RjZkPMilkwJ+OKxZWvgt6E6RuaAMSfAO02qLD8cIHXduF0Tu4Ob3gT084Vg= X-Received: by 2002:a25:ab0f:: with SMTP id u15mr2246861ybi.7.1597393852250; Fri, 14 Aug 2020 01:30:52 -0700 (PDT) MIME-Version: 1.0 References: <1597284810-17454-1-git-send-email-chinwen.chang@mediatek.com> <1597284810-17454-2-git-send-email-chinwen.chang@mediatek.com> In-Reply-To: <1597284810-17454-2-git-send-email-chinwen.chang@mediatek.com> From: Michel Lespinasse Date: Fri, 14 Aug 2020 01:30:39 -0700 Message-ID: Subject: Re: [PATCH v2 1/2] mmap locking API: add mmap_lock_is_contended() To: Chinwen Chang Cc: Matthias Brugger , Andrew Morton , Vlastimil Babka , Daniel Jordan , Davidlohr Bueso , Alexey Dobriyan , "Matthew Wilcox (Oracle)" , Jason Gunthorpe , Steven Price , Song Liu , Jimmy Assarsson , Huang Ying , LKML , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-fsdevel@vger.kernel.org, wsd_upstream@mediatek.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 12, 2020 at 7:14 PM Chinwen Chang wrote: > > Add new API to query if someone wants to acquire mmap_lock > for write attempts. > > Using this instead of rwsem_is_contended makes it more tolerant > of future changes to the lock type. > > Signed-off-by: Chinwen Chang Acked-by: Michel Lespinasse