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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 994C5C18E16 for ; Tue, 19 Jan 2021 18:30:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 67F1A230FE for ; Tue, 19 Jan 2021 18:30:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728709AbhASS3f (ORCPT ); Tue, 19 Jan 2021 13:29:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48084 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727140AbhASS31 (ORCPT ); Tue, 19 Jan 2021 13:29:27 -0500 Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BB752C0613D6 for ; Tue, 19 Jan 2021 10:28:26 -0800 (PST) Received: by mail-qt1-x82f.google.com with SMTP id e15so14408713qte.9 for ; Tue, 19 Jan 2021 10:28:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=ke7qD8F84c1d4EOseUsfShNOeUs7V6JI/1ybkVdZuas=; b=XmQ0R0kZqyfx6kYtmKEuaQdnV3pA/Gk5AOzBRpiTYl4tlHVj1r8AGgHQ4HlCBrkqJq d3htfUs3a6Vo7BoCaKhfTS/pKV/wBzzmfP1qsXIQg8CQxxbNzgZLm/tv7iPsO1sHRvpU TCZW7i1jjllBwoa546R0ibB0zkSMqcrkOGwMgnllWMEUgURDH4T3uEK++bfZv7/+4pbj kS8q1ESLc1z39UecPfNCeUXmJIGhwHZBA/TwP+5YpJBnaym8fbHoGkHnHv5RdAWXulup dtDZh1pKug65yM1CA0ASf5OqBnSDmxdk7ota2wSPE6R9R/dxgH45I+bA7mqqlvFaweeD jp4Q== 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; bh=ke7qD8F84c1d4EOseUsfShNOeUs7V6JI/1ybkVdZuas=; b=efEgrtvADsO48UgIBecxhe+N5WHigC/naJu19rcjtqtV+mSXzt+mcNSTWVH5c5x/M5 AVIQLEXZ8vIcfz2+4eGpmEkalon0Rknyffyh6C6YO7jnChDZUuXobMAXvOFp7pZtEyRX BlVPwsHzn7k7+W9OmRbHa6j/2sBL3n14yzd4wcx3m/o08FKXr7UP0sBEsI5zvJ67uRa0 hhET58hcRUCPL6VKu9lICItJKzAnfzXqDb/xYxi+uW7YlgxB+kGMx3wG4Bi32nM6tjNR 35w0T4GzI42Usdg8uW0oY7nDHQR7J+QFunZ4GpnJ4mmbzi95BJtm9sa6CDrNqGPARQ1x lDug== X-Gm-Message-State: AOAM532vLGRy38EbkUWW+4l8RC0c/MCS5ufSkmVRfvEnSIlYDc0jOFiI CrOAGGAFKKuA1ahRfkl3ehGBiw== X-Google-Smtp-Source: ABdhPJzA1g7p43l6AtNResDMMVS5o5wIwQMrXjddyfwRGWf3w+KrQJOMwx++nssqWWJKy8HjuEBVXA== X-Received: by 2002:ac8:2adb:: with SMTP id c27mr2484368qta.145.1611080906055; Tue, 19 Jan 2021 10:28:26 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-115-133.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.115.133]) by smtp.gmail.com with ESMTPSA id u5sm13640579qka.86.2021.01.19.10.28.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Jan 2021 10:28:25 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1l1vjt-003pdK-4n; Tue, 19 Jan 2021 14:28:25 -0400 Date: Tue, 19 Jan 2021 14:28:25 -0400 From: Jason Gunthorpe To: Pavel Tatashin Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, vbabka@suse.cz, mhocko@suse.com, david@redhat.com, osalvador@suse.de, dan.j.williams@intel.com, sashal@kernel.org, tyhicks@linux.microsoft.com, iamjoonsoo.kim@lge.com, mike.kravetz@oracle.com, rostedt@goodmis.org, mingo@redhat.com, peterz@infradead.org, mgorman@suse.de, willy@infradead.org, rientjes@google.com, jhubbard@nvidia.com, linux-doc@vger.kernel.org, ira.weiny@intel.com, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v5 03/14] mm/gup: return an error on migration failure Message-ID: <20210119182825.GA4605@ziepe.ca> References: <20210119043920.155044-1-pasha.tatashin@soleen.com> <20210119043920.155044-4-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210119043920.155044-4-pasha.tatashin@soleen.com> Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On Mon, Jan 18, 2021 at 11:39:09PM -0500, Pavel Tatashin wrote: > When migration failure occurs, we still pin pages, which means > that we may pin CMA movable pages which should never be the case. > > Instead return an error without pinning pages when migration failure > happens. > > No need to retry migrating, because migrate_pages() already retries > 10 times. > > Signed-off-by: Pavel Tatashin > mm/gup.c | 17 +++++++---------- > 1 file changed, 7 insertions(+), 10 deletions(-) Reviewed-by: Jason Gunthorpe