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Re: RCU (or equivalent) for NetBSD?

On Mar 3, 2013, at 12:18 PM, Dennis Ferguson 
<> wrote:

> On 3 Mar, 2013, at 14:37 , Thor Lancelot Simon <> 
> wrote:
>> On Sun, Mar 03, 2013 at 12:53:01PM +0800, Dennis Ferguson wrote:
>>> Could the NetBSD kernel now acquire RCU, or RCU-like,
>>> infrastructure?  I suspect I am incapable of designing this
>>> myself but I have a pretty good idea about what it would
>>> usefully enable.
>> The documentation is poor, but it references a paper which explains
>> better -- does pserialize(9) do what you want?
> The basic functions seem to be a perfect fit.
> The only bit I'm confused about is what the implication of
>    The read operations may happen from software interrupt at the
>    IPL_SOFTCLOCK symbolic level.
> is for an application that wants to use this interface.  Processing of packets
> arriving from hardware interfaces is traditionally run at IPL_SOFTNET, is the
> above telling me a reader can't use pserialize(9) if it is running at that
> level?

The opposite: pserialize may be used from soft interrupt context.

J. Hannken-Illjes - - TU Braunschweig 

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