Re: [PATCH 06/16] mm: balance slab aging

[Wu Fengguang]

On Wed, Dec 07, 2005 at 10:34:11PM +1100, Nick Piggin wrote:
> Wu Fengguang wrote:
> >A question about the current one:
> >
> >For a NUMA system with N nodes, the way kswapd calculates lru_pages - only 
> >sum
> >up local zones - may cause N times more shrinking than a 1-CPU system.
> >
> 
> But it is equal pressure for all pools involved in being scaned the
> simplifying assumption is that slab is equally distributed among
> nodes. And yeah, scanning would load up when more than 1 kswapd is
> running.
> 
> I had patches to do per-zone inode and dentry slab shrinking ages
> ago, but nobody was interested... so I'm guessing it is a feature :)

I rechecked shrink_dcache_memory()/prune_dcache(), it seems to be operating in
a global manner, which means (conceptually) if 10 nodes each scans 10%, the
global dcache is scanned 100%. Isn't it crazy? ;)

Thanks,
Wu
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