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SubjectRe: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches
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On Wed, 2008-07-16 at 09:03 -0500, Christoph Lameter wrote:
> Richard Kennedy wrote:
>
> > before
> > dentry 82136 82137 208 19 1 : tunables 0 0 0 : slabdata 4323 4323 0
> > after
> > dentry 79482 79482 208 39 2 : tunables 0 0 0 : slabdata 2038 2038 0
>
> 19 objects with an order 1 alloc and 208 byte size? Urgh. 8192/208 = 39 and not 19.
>
> Kmemcheck or something else active? We seem to be loosing 50% of our memory.
>
> Pekka: Is the slabinfo emulation somehow broken?
>
> I'd really like to see the output of slabinfo dentry.
>
/proc/slabinfo says it shows pages/slab not order -- so the numbers are consistent if nothing else.

I'm getting the log message
> SLUB: increasing order dentry->[1] [208]
from my code, so it looks correct. It's just the standard code is
picking order 0.

I'm just rebuilding the kernel & will get you that slabinfo

Richard



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