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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1B45AC433FE for ; Fri, 28 Jan 2022 14:21:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=makDagrHRlU7vaXpIkbBqsJmR2imX/hQ0vT1IyZGbe8=; b=V5QWkEJzTrOiBMBlUGXwk1Ym1K xNQunC3n/kpmFbPaMBZvrD2zP+lmWSsk0COZ3sEVbXy0UsL0X+CSUuP5gEGaoLTdJ4UKiSQegW4uB IeuOIshepIGpXQl+LKwsjKvpl14g0anqC+nyTPwF1AK5027TM4bcaypMWjoHl1QtxWOYMdi6EDLei +mhsZo0qTrshc5hqYJ7OJEO1H8GBFe+3qW1Fc5HGJ4E/WsBMW2rw7Sy/R7BvPq+e6dfadV18hQXBQ 2GylCYwqemBlQeiUFE6au8Y5qONaBGFLmBiS32GqFimxHLYdDRVkDnOZyKdJXxqsApxjoH1V1qqTx VGvZdH4Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDS8H-002WIo-9W; Fri, 28 Jan 2022 14:21:45 +0000 Received: from mail-qv1-xf2c.google.com ([2607:f8b0:4864:20::f2c]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDS8E-002WFO-G5 for linux-nvme@lists.infradead.org; Fri, 28 Jan 2022 14:21:43 +0000 Received: by mail-qv1-xf2c.google.com with SMTP id k4so5932823qvt.6 for ; Fri, 28 Jan 2022 06:21:41 -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=makDagrHRlU7vaXpIkbBqsJmR2imX/hQ0vT1IyZGbe8=; b=hagW1D3vrAXgmIdAaPuyb0ZYpBBI5GPj5cGf4t4VMPl2Hby0LDAfvZWMHlJD4RNPqz udQ6uMwMCSFght7z8OXaOlANPe89fBH+JadGzhs2iy3sYKIgrM8DNT9kykuob784vNJb /Y/FgIYpTCK+z7cKXzoYjO1GyqMmNfC0h5hNyGY73VQ5CoPXpXPP9nyVMuQ4vWD+VQga 0hYXfzvwCLnChzgjp4NqFihb4T9f8dI0raxoWaXnXY+5G5GDrUXCHtUcKwBORYZObA9Y YPaqcPq/4bzPj+zORYsBg7/S7b+i2mhRoE+TwNrxyzVcDs3wf6ttmJBlILKVUF4beVAI 0u4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=makDagrHRlU7vaXpIkbBqsJmR2imX/hQ0vT1IyZGbe8=; b=mtPvNrzizroh6BUfUvF9DURwnL4sMUBYVE1QoxbYnFlyxG8He+8M4wLgsWuZJtBccd lro2gbQXiFSJnnFC4HXfxXWHIv+fQrXpAgAfaOtuJ1mW4fmBrctJxSM8doILUbAJi32/ z78RbfdaOs2cUDvCDGs14W+//VlFh6aOpeB6Sr+Y1wuCp2DbW2P1MKQIjAVLqc3iGoEf P4IJVlbVVN+g9MeU4f0OqZEQJo3zhd7xg4cA+vu+kJ5FBxearhXBu7Og4fqY1ZGvbmwo hKBmrZZLOfTf1ZznfAnrYuWw7nldh5dF3TXAgxQJRyb9CgWce6mzIQzvoY8si+72Opjz DDgA== X-Gm-Message-State: AOAM5327UXN+wGCkUmQ2TwZJELCoKyyOa1cHJysRlTYfEJuEZa6pPm2W GIeNEuCkV4mKPRzT6vFQhaHarg== X-Google-Smtp-Source: ABdhPJw4cx6/r5UFZ4KcHMvTw88cPD84uAemPNZJJIK7lCC9YLt9fXRF4PueHdJDgL+a1AuPlHcoPg== X-Received: by 2002:a05:6214:519a:: with SMTP id kl26mr7027757qvb.68.1643379700472; Fri, 28 Jan 2022 06:21:40 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-113-129.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.113.129]) by smtp.gmail.com with ESMTPSA id o4sm3070925qtw.53.2022.01.28.06.21.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Jan 2022 06:21:39 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1nDS8A-007UXM-Bu; Fri, 28 Jan 2022 10:21:38 -0400 Date: Fri, 28 Jan 2022 10:21:38 -0400 From: Jason Gunthorpe To: Logan Gunthorpe Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Stephen Bates , Christoph Hellwig , Dan Williams , Christian =?utf-8?B?S8O2bmln?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Martin Oliveira , Chaitanya Kulkarni , Ralph Campbell , Alex Sierra Subject: Re: [PATCH v5 02/24] mm: remove extra ZONE_DEVICE struct page refcount Message-ID: <20220128142138.GU8034@ziepe.ca> References: <20220128002614.6136-1-logang@deltatee.com> <20220128002614.6136-3-logang@deltatee.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220128002614.6136-3-logang@deltatee.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220128_062142_561729_55F87CD1 X-CRM114-Status: GOOD ( 17.61 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Thu, Jan 27, 2022 at 05:25:52PM -0700, Logan Gunthorpe wrote: > From: Ralph Campbell > > ZONE_DEVICE struct pages have an extra reference count that complicates the > code for put_page() and several places in the kernel that need to check the > reference count to see that a page is not being used (gup, compaction, > migration, etc.). Clean up the code so the reference count doesn't need to > be treated specially for ZONE_DEVICE. > > [logang: dropped no longer used section from mm.h including > page_is_devmap_managed, rebased on v5.17-rc1 (possibly poorly)] > Signed-off-by: Ralph Campbell > Signed-off-by: Alex Sierra > Signed-off-by: Logan Gunthorpe > Reviewed-by: Christoph Hellwig > --- > arch/powerpc/kvm/book3s_hv_uvmem.c | 2 +- > drivers/gpu/drm/nouveau/nouveau_dmem.c | 2 +- > fs/dax.c | 4 +- > include/linux/dax.h | 2 +- > include/linux/memremap.h | 7 +-- > include/linux/mm.h | 44 ---------------- > lib/test_hmm.c | 2 +- > mm/internal.h | 8 +++ > mm/memcontrol.c | 6 +-- > mm/memremap.c | 70 +++++++------------------- > mm/migrate.c | 5 -- > mm/page_alloc.c | 3 ++ > mm/swap.c | 45 ++--------------- > 13 files changed, 46 insertions(+), 154 deletions(-) This patch still can't be applied until the FSDAX issues are solved, right? See my remarks the last time it was posted.. Jason