From patchwork Tue Oct 27 13:53:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 312967 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 B4BD6C55179 for ; Tue, 27 Oct 2020 14:22:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 780CF206FA for ; Tue, 27 Oct 2020 14:22:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603808533; bh=42CjmCMb+AeqTpHeBHAItavK9suHhyNVpT4eyETsJoc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qbdILtLm3su6VpUjRmShlY2M+lwDcB/0vz/1nwyLYvMQoLhe43A8+b+UJvjD9iBti KfgDfpFs0LnVXe+NP8NrEgWO9R38Z/BuVAfX/zTPt5KEsPtrKWDy5SR02PFrF5Id/m zFs4VWimW9NYIlHHBLMM9X7J6VAnK/EvEPGNLfZ4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408214AbgJ0OWM (ORCPT ); Tue, 27 Oct 2020 10:22:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:46610 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758677AbgJ0OWK (ORCPT ); Tue, 27 Oct 2020 10:22:10 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 EA287206D4; Tue, 27 Oct 2020 14:22:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603808529; bh=42CjmCMb+AeqTpHeBHAItavK9suHhyNVpT4eyETsJoc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MX3Z6GYibHeDbhy8VU29zH68hjbv8iy3lfjuTKcs3Rf3XdPAQyP3maMR8N73Soijp +yEbX8aE0ZRbYxgsVxvz12hXKr1TR9q2X2jA4mhciiq13hz8xA3fLLWcELUUi9gLU7 /fYd+y+zMcQCW0dzPL2S0YoBiUWSvOGKLA9DVQYY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ralph Campbell , Andrew Morton , Johannes Weiner , Michal Hocko , Vladimir Davydov , Jerome Glisse , Balbir Singh , Ira Weiny , Linus Torvalds , Sasha Levin Subject: [PATCH 4.19 127/264] mm/memcg: fix device private memcg accounting Date: Tue, 27 Oct 2020 14:53:05 +0100 Message-Id: <20201027135436.650469259@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135430.632029009@linuxfoundation.org> References: <20201027135430.632029009@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ralph Campbell [ Upstream commit 9a137153fc8798a89d8fce895cd0a06ea5b8e37c ] The code in mc_handle_swap_pte() checks for non_swap_entry() and returns NULL before checking is_device_private_entry() so device private pages are never handled. Fix this by checking for non_swap_entry() after handling device private swap PTEs. I assume the memory cgroup accounting would be off somehow when moving a process to another memory cgroup. Currently, the device private page is charged like a normal anonymous page when allocated and is uncharged when the page is freed so I think that path is OK. Signed-off-by: Ralph Campbell Signed-off-by: Andrew Morton Acked-by: Johannes Weiner Cc: Michal Hocko Cc: Vladimir Davydov Cc: Jerome Glisse Cc: Balbir Singh Cc: Ira Weiny Link: https://lkml.kernel.org/r/20201009215952.2726-1-rcampbell@nvidia.com xFixes: c733a82874a7 ("mm/memcontrol: support MEMORY_DEVICE_PRIVATE") Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/memcontrol.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index aa730a3d5c258..87cd5bf1b4874 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4780,7 +4780,7 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, struct page *page = NULL; swp_entry_t ent = pte_to_swp_entry(ptent); - if (!(mc.flags & MOVE_ANON) || non_swap_entry(ent)) + if (!(mc.flags & MOVE_ANON)) return NULL; /* @@ -4799,6 +4799,9 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, return page; } + if (non_swap_entry(ent)) + return NULL; + /* * Because lookup_swap_cache() updates some statistics counter, * we call find_get_page() with swapper_space directly.