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    SubjectRe: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call_srcu()
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    On Tue, Mar 6, 2012 at 7:16 PM, Peter Zijlstra <peterz@infradead.org> 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.

    CC: tj@kernel.org
    It could be better if workqueue also supports 2*sizeof(long) work callbacks.

    I prefer ability/functionality a little more, it eases the caller's pain.
    preemptible callbacks also eases the pressure of the whole system.
    But I'm also ok if we limit the srcu-callbacks in softirq.

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