Re: [PATCH 4/4] slub: refactoring unfreeze_partials()

[Christoph Lameter <cl@xxxxxxxxx>]

On Fri, 18 May 2012, Joonsoo Kim wrote:

> I think that these are disadvantages of current implementation,
> so I do refactoring unfreeze_partials().

The reason the current implementation is so complex is to avoid races. The
state of the list and the state of the partial pages must be consistent at
all times.

> Minimizing code in do {} while loop introduce a reduced fail rate
> of cmpxchg_double_slab. Below is output of 'slabinfo -r kmalloc-256'
> when './perf stat -r 33 hackbench 50 process 4000 > /dev/null' is done.

Looks good. If I can convince myself that this does not open up any
new races then I may ack it.

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