From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E77B4C10F0E for ; Thu, 18 Apr 2019 13:34:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B2B5720652 for ; Thu, 18 Apr 2019 13:34:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazonses.com header.i=@amazonses.com header.b="ab1gt2ub" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388875AbfDRNey (ORCPT ); Thu, 18 Apr 2019 09:34:54 -0400 Received: from a9-32.smtp-out.amazonses.com ([54.240.9.32]:49086 "EHLO a9-32.smtp-out.amazonses.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727807AbfDRNey (ORCPT ); Thu, 18 Apr 2019 09:34:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=6gbrjpgwjskckoa6a5zn6fwqkn67xbtw; d=amazonses.com; t=1555594493; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:MIME-Version:Content-Type:Feedback-ID; bh=tGKbg7T4m2hja67VSnD+5sN45YQjy0gEHiOhoXRYwnE=; b=ab1gt2ubDBnvlERvCSi1ce9rbtCoG/YS77M3OGWWcVMUjDZG7kdCTAIh3pFVU73u JBYkidNGYMpwtlzEcOGCrYV7+GGxIkApxsJL4FIYB0Sro4vm00cQ7klrHZkK5gkWFTd +5z2ftsGtTwkIdbIkR74gay/PBi7mTjrZi0orids= Date: Thu, 18 Apr 2019 13:34:52 +0000 From: Christopher Lameter X-X-Sender: cl@nuc-kabylake To: Roman Gushchin cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, Johannes Weiner , Michal Hocko , Rik van Riel , david@fromorbit.com, Pekka Enberg , Vladimir Davydov , cgroups@vger.kernel.org, Roman Gushchin Subject: Re: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management In-Reply-To: <20190417215434.25897-5-guro@fb.com> Message-ID: <0100016a30a83bcf-7f99039c-77ec-4c48-a1c4-92e398f8f185-000000@email.amazonses.com> References: <20190417215434.25897-1-guro@fb.com> <20190417215434.25897-5-guro@fb.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-SES-Outgoing: 2019.04.18-54.240.9.32 Feedback-ID: 1.us-east-1.fQZZZ0Xtj2+TD7V5apTT/NrT6QKuPgzCT/IC7XYgDKI=:AmazonSES Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 17 Apr 2019, Roman Gushchin wrote: > Let's make every page to hold a reference to the kmem_cache (we > already have a stable pointer), and make kmem_caches to hold a single > reference to the memory cgroup. Ok you are freeing one word in the page struct that can be used for other purposes now? From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christopher Lameter Subject: Re: [PATCH 4/5] mm: rework non-root kmem_cache lifecycle management Date: Thu, 18 Apr 2019 13:34:52 +0000 Message-ID: <0100016a30a83bcf-7f99039c-77ec-4c48-a1c4-92e398f8f185-000000@email.amazonses.com> References: <20190417215434.25897-1-guro@fb.com> <20190417215434.25897-5-guro@fb.com> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=6gbrjpgwjskckoa6a5zn6fwqkn67xbtw; d=amazonses.com; t=1555594493; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:MIME-Version:Content-Type:Feedback-ID; bh=tGKbg7T4m2hja67VSnD+5sN45YQjy0gEHiOhoXRYwnE=; b=ab1gt2ubDBnvlERvCSi1ce9rbtCoG/YS77M3OGWWcVMUjDZG7kdCTAIh3pFVU73u JBYkidNGYMpwtlzEcOGCrYV7+GGxIkApxsJL4FIYB0Sro4vm00cQ7klrHZkK5gkWFTd +5z2ftsGtTwkIdbIkR74gay/PBi7mTjrZi0orids= In-Reply-To: <20190417215434.25897-5-guro@fb.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Roman Gushchin Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, Johannes Weiner , Michal Hocko , Rik van Riel , david@fromorbit.com, Pekka Enberg , Vladimir Davydov , cgroups@vger.kernel.org, Roman Gushchin On Wed, 17 Apr 2019, Roman Gushchin wrote: > Let's make every page to hold a reference to the kmem_cache (we > already have a stable pointer), and make kmem_caches to hold a single > reference to the memory cgroup. Ok you are freeing one word in the page struct that can be used for other purposes now?