Re: [patch 2/3] slub: scan partial list for free slabs whenthrashing

[Christoph Lameter]

On Sun, 29 Mar 2009, David Rientjes wrote:

> Whenever a cpu cache satisfies a fastpath allocation, a fastpath counter
> is incrememted.  This counter is cleared whenever the slowpath is
> invoked.  This tracks how many fastpath allocations the cpu slab has
> fulfilled before it must be refilled.

That adds fastpath overhead and it shows for small objects in your tests.

> A new statistic, /sys/kernel/slab/cache/deferred_partial, indicates how
> many times a partial list was deferred because no slabs could satisfy
> the requisite number of objects for CONFIG_SLUB_STATS kernels.

Interesting approach.

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