linux-kernel - Re: [RFC PATCH] Introducing lockless cache built on top of slab allocator

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Message-ID: <56f30136-23ce-dd73-705c-4e1326768c9d@huawei.com>
Date:   Mon, 20 Sep 2021 15:41:16 +0100
From:   John Garry <john.garry@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>
CC:     Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [RFC PATCH] Introducing lockless cache built on top of slab
 allocator

On 20/09/2021 02:53, Matthew Wilcox wrote:
> On Mon, Sep 20, 2021 at 01:09:38AM +0000, Hyeonggon Yoo wrote:
>> Hello Matthew, Thanks to give me a comment! I appreciate it.
>>
>> On Sun, Sep 19, 2021 at 08:17:44PM +0100, Matthew Wilcox wrote:
>>> On Sun, Sep 19, 2021 at 04:42:39PM +0000, Hyeonggon Yoo wrote:
>>>> It is just simple proof of concept, and not ready for submission yet.
>>>> There can be wrong code (like wrong gfp flags, or wrong error handling,
>>>> etc) it is just simple proof of concept. I want comment from you.
>>>
>>> Have you read:
>>>
>>> https://www.usenix.org/legacy/event/usenix01/full_papers/bonwick/bonwick_html/
>>> The relevant part of that paper is section 3, magazines.  We should have
>>> low and high water marks for number of objects
>>

In case unknown, jfyi there is an implementation of this in 
drivers/iommu/iova.c

Thanks,
John

>> I haven't read that before, but after reading it seems not different from
>> SLAB's percpu queuing.
>>   
>>> and we should allocate
>>> from / free to the slab allocator in batches.  Slab has bulk alloc/free
>>> APIs already.
>>>