From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f72.google.com (mail-pg0-f72.google.com [74.125.83.72]) by kanga.kvack.org (Postfix) with ESMTP id 6265928029C for ; Wed, 17 Jan 2018 09:17:15 -0500 (EST) Received: by mail-pg0-f72.google.com with SMTP id w186so11568176pgb.10 for ; Wed, 17 Jan 2018 06:17:15 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org. [65.50.211.133]) by mx.google.com with ESMTPS id m3si3885297pgs.54.2018.01.17.06.17.14 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 17 Jan 2018 06:17:14 -0800 (PST) Date: Wed, 17 Jan 2018 06:17:04 -0800 From: Matthew Wilcox Subject: Re: [RFC] mm: why vfree() do not free page table memory? Message-ID: <20180117141704.GA10398@bombadil.infradead.org> References: <5A4603AB.8060809@huawei.com> <0ffd113e-84da-bd49-2b63-3d27d2702580@suse.cz> <5A5F1C09.9040000@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5A5F1C09.9040000@huawei.com> Sender: owner-linux-mm@kvack.org List-ID: To: Xishi Qiu Cc: Vlastimil Babka , Michal Hocko , Mel Gorman , LKML , Linux MM , "Wujiangtao (A)" On Wed, Jan 17, 2018 at 05:48:57PM +0800, Xishi Qiu wrote: > > Did you notice an actual issue, or is this just theoretical concern. > > Yes, we have this problem on our production line. > I find the page table memory takes 200-300M. 200MB? That's mapping 800GB of virtual address space. That must be quite the module you're loading there ... -- 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