From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f43.google.com (mail-wg0-f43.google.com [74.125.82.43]) by kanga.kvack.org (Postfix) with ESMTP id 2E3A06B006E for ; Tue, 2 Dec 2014 06:30:21 -0500 (EST) Received: by mail-wg0-f43.google.com with SMTP id l18so16648909wgh.30 for ; Tue, 02 Dec 2014 03:30:20 -0800 (PST) Received: from jenni2.inet.fi (mta-out1.inet.fi. [62.71.2.227]) by mx.google.com with ESMTP id e3si35694581wix.69.2014.12.02.03.30.18 for ; Tue, 02 Dec 2014 03:30:18 -0800 (PST) Date: Tue, 2 Dec 2014 13:30:14 +0200 From: "Kirill A. Shutemov" 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> Sender: owner-linux-mm@kvack.org List-ID: To: "Wang, Yalin" Cc: "'linux-kernel@vger.kernel.org'" , "'linux-mm@kvack.org'" , "'linux-arm-kernel@lists.infradead.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, 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