Re: Large slab cache in 2.6.1

[Nick Piggin]

Andrew Morton wrote:

> Chris Wedgwood <cw@xxxxxxxx> wrote:
>
> > On Sun, Feb 22, 2004 at 05:35:09PM +1100, Nick Piggin wrote:
> >
> >
> > > Can you maybe use this patch then, please?
> > I probably need to do more testing, but the quick patch I was using
> > against mainline (bk head) works better than this against 2.5.3-mm2.
>
> The patch which went in six months or so back which said "only reclaim slab
> if we're scanning lowmem pagecache" was wrong.  I must have been asleep at
> the time.
>
> We do need to scan slab in response to highmem page reclaim as well. 
> Because all the math is based around the total amount of memory in the
> machine, and we know that if we're performing highmem page reclaim then the
> lower zones have no free memory.

I don't understand this. Presumably if the lower zones have no free
memory then we'll be doing lowmem page reclaim too, and that will
be shrinking the slab.

The patch I sent you should (modulo the ->seeks stuff) make it
behave as if the slab pages are on lowmem LRUs and get scanned
accordingly.


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