linux-kernel - Re: [RFC PATCH 0/5] kmalloc-reclaimable caches

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Message-ID: <fea26519-2b5f-b404-872d-47afabcd3393@suse.cz>
Date:   Thu, 24 May 2018 17:52:25 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Roman Gushchin <guro@...com>
Cc:     linux-mm@...ck.org, Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vijayanand Jitta <vjitta@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>
Subject: Re: [RFC PATCH 0/5] kmalloc-reclaimable caches

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?

>> I did a superset as IIRC somebody suggested that in the older threads or at LSF.
> 
> This looks nice to me!
> 
> Thanks!
>