From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f197.google.com (mail-io0-f197.google.com [209.85.223.197]) by kanga.kvack.org (Postfix) with ESMTP id 5D9DA6B025F for ; Tue, 15 Aug 2017 11:11:25 -0400 (EDT) Received: by mail-io0-f197.google.com with SMTP id f69so11756670ioe.10 for ; Tue, 15 Aug 2017 08:11:25 -0700 (PDT) Received: from resqmta-po-06v.sys.comcast.net (resqmta-po-06v.sys.comcast.net. [2001:558:fe16:19:96:114:154:165]) by mx.google.com with ESMTPS id a75si9466424ioa.80.2017.08.15.08.11.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 15 Aug 2017 08:11:24 -0700 (PDT) Date: Tue, 15 Aug 2017 10:11:22 -0500 (CDT) From: Christopher Lameter Subject: Re: How can we share page cache pages for reflinked files? In-Reply-To: <20170814210959.r4mdv3y4rdeolyxt@node.shutemov.name> Message-ID: References: <20170810042849.GK21024@dastard> <20170810161159.GI31390@bombadil.infradead.org> <20170811042519.GS21024@dastard> <20170811170847.GK31390@bombadil.infradead.org> <20170814064838.GB21024@dastard> <20170814210959.r4mdv3y4rdeolyxt@node.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Dave Chinner , Matthew Wilcox , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org On Tue, 15 Aug 2017, Kirill A. Shutemov wrote: > > This would also allow the inevitable creeping page struct bloat to get > > completely out of control. > > Nice wish list. Add pony. :) > > Any attempt to replace struct page with something more complex will have > severe performance implications. I'll be glad proved otherwise. Do we care that much anymore? I have people inserting all sorts of runtime checks into hotpaths in the name of security..... -- 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