mm, slub: lower the default slub_max_order with CONFIG_SLUB_TINY

With CONFIG_SLUB_TINY we want to minimize memory overhead. By lowering
the default slub_max_order we can make slab allocations use smaller
pages. However depending on object sizes, order-0 might not be the best
due to increased fragmentation. When testing on a 8MB RAM k210 system by
Damien Le Moal [1], slub_max_order=1 had the best results, so use that
as the default for CONFIG_SLUB_TINY.

[1] https://lore.kernel.org/all/[email protected]/

Signed-off-by: Vlastimil Babka <[email protected]>
Acked-by: Roman Gushchin <[email protected]>
Reviewed-by: Hyeonggon Yoo <[email protected]>
Acked-by: Mike Rapoport <[email protected]>
Reviewed-by: Christoph Lameter <[email protected]>

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