From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f172.google.com (mail-pf0-f172.google.com [209.85.192.172]) by kanga.kvack.org (Postfix) with ESMTP id EF8236B0005 for ; Wed, 3 Feb 2016 04:29:38 -0500 (EST) Received: by mail-pf0-f172.google.com with SMTP id o185so10966975pfb.1 for ; Wed, 03 Feb 2016 01:29:38 -0800 (PST) Received: from mx2.parallels.com (mx2.parallels.com. [199.115.105.18]) by mx.google.com with ESMTPS id os9si8106271pab.169.2016.02.03.01.29.38 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 03 Feb 2016 01:29:38 -0800 (PST) Date: Wed, 3 Feb 2016 12:29:26 +0300 From: Vladimir Davydov Subject: Re: [PATCH 3/3] mm: remove unnecessary uses of lock_page_memcg() Message-ID: <20160203092926.GG21016@esperanza> References: <1454109573-29235-1-git-send-email-hannes@cmpxchg.org> <1454109573-29235-4-git-send-email-hannes@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <1454109573-29235-4-git-send-email-hannes@cmpxchg.org> Sender: owner-linux-mm@kvack.org List-ID: To: Johannes Weiner Cc: Andrew Morton , Michal Hocko , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com On Fri, Jan 29, 2016 at 06:19:33PM -0500, Johannes Weiner wrote: > There are several users that nest lock_page_memcg() inside lock_page() > to prevent page->mem_cgroup from changing. But the page lock prevents > pages from moving between cgroups, so that is unnecessary overhead. > > Remove lock_page_memcg() in contexts with locked contexts and fix the > debug code in the page stat functions to be okay with the page lock. > > Signed-off-by: Johannes Weiner Acked-by: Vladimir Davydov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org