From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f44.google.com (mail-pa0-f44.google.com [209.85.220.44]) by kanga.kvack.org (Postfix) with ESMTP id 0C8E16B0036 for ; Wed, 21 May 2014 15:34:48 -0400 (EDT) Received: by mail-pa0-f44.google.com with SMTP id ld10so1695891pab.17 for ; Wed, 21 May 2014 12:34:48 -0700 (PDT) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTP id lp7si30407595pab.189.2014.05.21.12.34.47 for ; Wed, 21 May 2014 12:34:48 -0700 (PDT) Date: Wed, 21 May 2014 12:34:46 -0700 From: Andrew Morton Subject: Re: [PATCH] mm: /prom/pid/clear_refs: avoid split_huge_page() Message-Id: <20140521123446.ae45fa676cae27fffbd96cfd@linux-foundation.org> In-Reply-To: <1400699062-20123-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1400699062-20123-1-git-send-email-kirill.shutemov@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrea Arcangeli , Pavel Emelyanov , Cyrill Gorcunov , Dave Hansen On Wed, 21 May 2014 22:04:22 +0300 "Kirill A. Shutemov" wrote: > Currently we split all THP pages on any clear_refs request. It's not > necessary. We can handle this on PMD level. > > One side effect is that soft dirty will potentially see more dirty > memory, since we will mark whole THP page dirty at once. This clashes pretty badly with http://ozlabs.org/~akpm/mmots/broken-out/clear_refs-redefine-callback-functions-for-page-table-walker.patch > Sanity checked with CRIU test suite. More testing is required. Will you be doing that testing or was this a request for Cyrill & co to help? Perhaps this is post-3.15 material. -- 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