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x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfNa56oF+I8g/lQ+6ZVZVbNjGGGm9wUJrz4GEoEZcdwiVpybKXHjYYdrrnTmVdkvoMRc36FK8addqC/0Z23sY80SiPzRw6P87CNMI+vCJ0c8V6C9tBj59 RdvgxvoQojI6jm/ZMd5jGZhJewdcDLsD6HrGewX6eRs7roIebOeB7xwWu+GlgsS8mqMqc39+d2qZeWh/75KD5nWXiXVusSNT7Hx/eSCqwuQcG4umJDDTtODy X-CM-Analysis: v=2.3 cv=FKU1Odgs c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=IkcTkHD0fZMA:10 a=xqWC_Br6kY4A:10 a=4_-BN3WEXhEA:10 a=VUJBJC2UJ8kA:10 a=D19gQVrFAAAA:8 a=VwQbUJbxAAAA:8 a=bdXydZEAbkn392bGRPwA:9 a=QEXdDO2ut3YA:10 a=x8gzFH9gYPwA:10 a=W4TVW4IDbPiebHqcZpNg:22 a=AjGcO6oz07-iQ99wixmX:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967556AbeEXRfH (ORCPT ); Thu, 24 May 2018 13:35:07 -0400 Received: from mail-oi0-f65.google.com ([209.85.218.65]:37042 "EHLO mail-oi0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967513AbeEXRfG (ORCPT ); Thu, 24 May 2018 13:35:06 -0400 X-Google-Smtp-Source: AB8JxZpWhQAY1Su+ozEiWPnQ7wYGw2WMvthW7JwrlC0JTHIeuMZeq95692IFa6anisRHVZZI11xMCA== Subject: Re: [RFC PATCH 0/5] kmalloc-reclaimable caches To: Vlastimil Babka , Roman Gushchin Cc: linux-mm@kvack.org, Michal Hocko , Johannes Weiner , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Mel Gorman , Vijayanand Jitta References: <20180524110011.1940-1-vbabka@suse.cz> <20180524121347.GA10763@castle.DHCP.thefacebook.com> From: Laura Abbott Message-ID: <01cbee1d-e5cf-8de1-6610-3043a2c5d5ca@redhat.com> Date: Thu, 24 May 2018 10:35:03 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 05/24/2018 08:52 AM, Vlastimil Babka wrote: > On 05/24/2018 02:13 PM, Roman Gushchin wrote: >> On Thu, May 24, 2018 at 01:00:06PM +0200, Vlastimil Babka wrote: >>> Hi, >>> >>> - I haven't find any other obvious users for reclaimable kmalloc (yet) >> >> As I remember, ION memory allocator was discussed related to this theme: >> https://lkml.org/lkml/2018/4/24/1288 > > +CC Laura > > Yeah ION added the NR_INDIRECTLY_RECLAIMABLE_BYTES handling, which is > adjusted to page granularity in patch 4. I'm not sure if it should use > kmalloc as it seems to be allocating order-X pages, where kmalloc/slab > just means extra overhead. But maybe if it doesn't allocate/free too > frequently, it could work? > The page pool allocation is supposed to be a slow path but it's one I'd rather not have too much overhead. It also just looks really odd to be allocating higher order pages via kmalloc imho. >>> I did a superset as IIRC somebody suggested that in the older threads or at LSF. >> >> This looks nice to me! >> >> Thanks! >> >