Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call_srcu()

[Lai Jiangshan]

On Tue, Mar 6, 2012 at 7:16 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Tue, 2012-03-06 at 17:57 +0800, Lai Jiangshan wrote:
>>         srcu_head is bigger, it is worth, it provides more ability and simplify
>>         the srcu code.
>
> Dubious claim.. memory footprint of various data structures is deemed
> important. rcu_head is 16 bytes, srcu_head is 32 bytes. I think it would
> be real nice not to have two different callback structures and not grow
> them as large.

Also "Dubious" "simplify"?

bigger struct makes we can store ->check_seq in the callback, makes
the processing simply.

bigger struct is not required here, we can use a little complex way(batches)
to do it.

>
>
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