Re: [v7 0/8] Reduce cross CPU IPI interference

[Peter Zijlstra]

On Thu, 2012-01-26 at 12:01 +0200, Gilad Ben-Yossef wrote:
> Gilad Ben-Yossef (8):
>   smp: introduce a generic on_each_cpu_mask function
>   arm: move arm over to generic on_each_cpu_mask
>   tile: move tile to use generic on_each_cpu_mask
>   smp: add func to IPI cpus based on parameter func
>   slub: only IPI CPUs that have per cpu obj to flush
>   fs: only send IPI to invalidate LRU BH when needed
>   mm: only IPI CPUs to drain local pages if they exist

These patches look very nice!

Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>


>   mm: add vmstat counters for tracking PCP drains
> 
I understood from previous postings this patch wasn't meant for
inclusion, if it is, note that cpumask_weight() is a potentially very
expensive operation.
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