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=-2.1 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable 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 7834BC0044C for ; Mon, 5 Nov 2018 10:44:43 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D97D720869 for ; Mon, 5 Nov 2018 10:44:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="uD4kXIYF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D97D720869 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 42pTnw6RY5zF1S0 for ; Mon, 5 Nov 2018 21:44:36 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="uD4kXIYF"; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::441; helo=mail-pf1-x441.google.com; envelope-from=bsingharora@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="uD4kXIYF"; dkim-atps=neutral Received: from mail-pf1-x441.google.com (mail-pf1-x441.google.com [IPv6:2607:f8b0:4864:20::441]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 42pTl75sZvzF14S for ; Mon, 5 Nov 2018 21:42:11 +1100 (AEDT) Received: by mail-pf1-x441.google.com with SMTP id v9-v6so1939528pff.2 for ; Mon, 05 Nov 2018 02:42:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=KaX4ickUP2xJqqvsEKJ5Vs4ivT5tvDy6g+wMhbatxDg=; b=uD4kXIYFb0UAD7CZH1sMfBl0Hl/LFkEALDbaOGnECc0Q+Z51M27D5Yxz6DIBQzULxm reRWEigl7oxEHTH3Fn/OKOD9eiAvK8e7gV30tjZpsXAZv0pYS7q8U7RiTcNqxePQGyWb T90R/KWkXBCybaDSGu1ZkXXtBvWTNe0giqDyGNVToyPsPqRTgliVKGA17jc5nJ83eZ7N ELs/9S+pFDhTuYcYR+fpof+7qUodT0LW64VlWUjgNp4y8P759N/NKsBrTuWF3g5ZiEcO A6ay8bQ6G7bIfdXRNSKS69FMjkzUkFZhTwz5EiVEesgFb1hcXJoPnIgOKAdO/HVysEYF T7bQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=KaX4ickUP2xJqqvsEKJ5Vs4ivT5tvDy6g+wMhbatxDg=; b=ETCxa+CtVdl7qE6NnwF52tldV9w33dE+qxwmLNSd/AJl/HFKmph+78XXag8Fsgin9m TL3a4WNXyG09DbcAHiTaeJvTmWUOoiUXwRLwcfmw/e1ezJNq+RB/emI9ykaRIVV7zy56 xCoy/Q3b5wWBhi2JZJ5pBjvi1eOk3NS/8XAVgnQx0abWWthBuhoXJE2FSwzYyLpi6+PP 7zoIKjzEAdKigkc1P31BO6+AIRIbP65/C86V3QcOfwV7sgsLIJcfsuj1nzZJCW7avwqJ I03WuRTuYcuWJIerk/IxxCMQw5viIHJ63+EeT91RYiho+7agEAH9eb3+f/h37RnCL3vR ZnGg== X-Gm-Message-State: AGRZ1gK4M+cDIb1fmeYax56b44eWcCk/UlK6gH6vwiXrzt8KY5Irf40X PZYyQpN42mDhKXbovqAb5Xk= X-Google-Smtp-Source: AJdET5eS/IZYoAV405Xq3B/n/CYAETwSCEmsxF9chUXPV5oaUfcXsaMbgz5UtiaC5m5z2cKDeXYtqA== X-Received: by 2002:a65:5bc4:: with SMTP id o4mr6132232pgr.426.1541414529233; Mon, 05 Nov 2018 02:42:09 -0800 (PST) Received: from localhost (14-202-194-140.static.tpgi.com.au. [14.202.194.140]) by smtp.gmail.com with ESMTPSA id r1-v6sm59238353pfb.41.2018.11.05.02.42.07 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 05 Nov 2018 02:42:08 -0800 (PST) Date: Mon, 5 Nov 2018 21:42:04 +1100 From: Balbir Singh To: Laurent Dufour Subject: Re: [PATCH v11 00/26] Speculative page faults Message-ID: <20181105104204.GB9042@350D> References: <1526555193-7242-1-git-send-email-ldufour@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1526555193-7242-1-git-send-email-ldufour@linux.vnet.ibm.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jack@suse.cz, sergey.senozhatsky.work@gmail.com, peterz@infradead.org, Will Deacon , mhocko@kernel.org, linux-mm@kvack.org, paulus@samba.org, Punit Agrawal , hpa@zytor.com, Alexei Starovoitov , khandual@linux.vnet.ibm.com, Andrea Arcangeli , ak@linux.intel.com, Minchan Kim , x86@kernel.org, Matthew Wilcox , Daniel Jordan , Ingo Molnar , David Rientjes , paulmck@linux.vnet.ibm.com, npiggin@gmail.com, Jerome Glisse , dave@stgolabs.net, kemi.wang@intel.com, kirill@shutemov.name, Thomas Gleixner , Ganesh Mahendran , Yang Shi , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Sergey Senozhatsky , vinayak menon , aneesh.kumar@linux.vnet.ibm.com, akpm@linux-foundation.org, Tim Chen , haren@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, May 17, 2018 at 01:06:07PM +0200, Laurent Dufour wrote: > This is a port on kernel 4.17 of the work done by Peter Zijlstra to handle > page fault without holding the mm semaphore [1]. > > The idea is to try to handle user space page faults without holding the > mmap_sem. This should allow better concurrency for massively threaded Question -- I presume mmap_sem (rw_semaphore implementation tested against) was qrwlock? Balbir Singh.