Re: Large slab cache in 2.6.1

[Mike Fedyk]

Ed Tomlinson wrote:

> On February 21, 2004 10:28 pm, Linus Torvalds wrote:
>
> > On Sat, 21 Feb 2004, Chris Wedgwood wrote:
> >
> >
> > > Maybe gradual page-cache pressure could shirnk the slab?
> >
> >
> > What happened to the experiment of having slab pages on the (in)active
> > lists and letting them be free'd that way? Didn't somebody already do 
> > that? Ed Tomlinson and Craig Kulesa?
>
>
> You have a good memory.  
>
> We dropped this experiment since there was a lot of latency between the time a 
> slab page became freeable and when it was actually freed.  The current 
> call back scheme was designed to balance slab preasure and vmscaning.

Does it really matter if there is a lot of latency?  How does this 
affect real-world results?  IOW, if it's not at the end of the LRU, then 
there's probably something better to free instead...

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