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

[John Garry]

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.