Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754542AbaLBLat (ORCPT ); Tue, 2 Dec 2014 06:30:49 -0500 Received: from mta-out1.inet.fi ([62.71.2.203]:40470 "EHLO jenni2.inet.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751591AbaLBLas (ORCPT ); Tue, 2 Dec 2014 06:30:48 -0500 Date: Tue, 2 Dec 2014 13:30:14 +0200 From: "Kirill A. Shutemov" To: "Wang, Yalin" Cc: "'linux-kernel@vger.kernel.org'" , "'linux-mm@kvack.org'" , "'linux-arm-kernel@lists.infradead.org'" Subject: Re: [RFC V2] mm:add zero_page _mapcount when mapped into user space Message-ID: <20141202113014.GA22683@node.dhcp.inet.fi> References: <35FD53F367049845BC99AC72306C23D103E688B313E0@CNBJMBX05.corpusers.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <35FD53F367049845BC99AC72306C23D103E688B313E0@CNBJMBX05.corpusers.net> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 02, 2014 at 05:27:36PM +0800, Wang, Yalin wrote: > This patch add/dec zero_page's _mapcount to make sure > the mapcount is correct for zero_page, > so that when read from /proc/kpagecount, zero_page's > mapcount is also correct, userspace process like procrank can > calculate PSS correctly. I don't have specific code path to point to, but I would expect zero page with non-zero mapcount would cause a problem with rmap. How do you test the change? -- Kirill A. Shutemov -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/