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=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 F0766C4741F for ; Tue, 29 Sep 2020 11:02:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6DBA4216C4 for ; Tue, 29 Sep 2020 11:02:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6DBA4216C4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6DAD36B005C; Tue, 29 Sep 2020 07:02:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 68A988E0001; Tue, 29 Sep 2020 07:02:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 59F706B0062; Tue, 29 Sep 2020 07:02:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0032.hostedemail.com [216.40.44.32]) by kanga.kvack.org (Postfix) with ESMTP id 445786B005C for ; Tue, 29 Sep 2020 07:02:26 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 0162C82499A8 for ; Tue, 29 Sep 2020 11:02:26 +0000 (UTC) X-FDA: 77315810292.24.cream56_220a2cb27189 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin24.hostedemail.com (Postfix) with ESMTP id CA08C1A4AA for ; Tue, 29 Sep 2020 11:02:25 +0000 (UTC) X-HE-Tag: cream56_220a2cb27189 X-Filterd-Recvd-Size: 2602 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf25.hostedemail.com (Postfix) with ESMTP for ; Tue, 29 Sep 2020 11:02:25 +0000 (UTC) Received: from localhost (unknown [213.57.247.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A3DEE20848; Tue, 29 Sep 2020 11:02:23 +0000 (UTC) Date: Tue, 29 Sep 2020 14:02:19 +0300 From: Leon Romanovsky To: Linus Torvalds Cc: Peter Xu , Linux Kernel Mailing List , Linux-MM , Jason Gunthorpe , John Hubbard , Andrew Morton , Christoph Hellwig , Yang Shi , Oleg Nesterov , Kirill Tkhai , Kirill Shutemov , Hugh Dickins , Jann Horn , Michal Hocko , Jan Kara , Andrea Arcangeli Subject: Re: [PATCH v2 0/4] mm: Break COW for pinned pages during fork() Message-ID: <20200929110219.GF3094@unreal> References: <20200925222600.6832-1-peterx@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 Sun, Sep 27, 2020 at 12:35:59PM -0700, Linus Torvalds wrote: > On Fri, Sep 25, 2020 at 3:26 PM Peter Xu wrote: > > > > This series is majorly inspired by the previous discussion on the list [1], > > starting from the report from Jason on the rdma test failure. > > Ok, this is now in my git tree with the changes I outlined in the other email. > > > I tested it myself with fork() after vfio pinning a bunch of device pages, > > .. but _my_ only testing was to just add a nasty hack that said that > all pages are pinned, and made fork() much slower, but hey, it at > least tests the preallocation paths etc. And I'm not seeing any > obvious failures due to taking that slow-path that is supposed to be a > special case. > > Let's hope this closes the rdma issues. Hi Linus, We tested your tree upto commit "fb0155a09b02 Merge tag 'nfs-for-5.9-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs" and our RDMA tests passed. Thanks > > Linus