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

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Message-ID: <20210920155010.GA31923@kvm.asia-northeast3-a.c.our-ratio-313919.internal>
Date:   Mon, 20 Sep 2021 15:50:10 +0000
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     John Garry <john.garry@...wei.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        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 Mon, Sep 20, 2021 at 03:41:16PM +0100, John Garry wrote:
> 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 for good information. I'll take a look at it!

Thanks,
Hyeonggon

> 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.
> > > >