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DragonFly kernel List (threaded) for 2010-12
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Re: Internalizing M_EXT refcounting and lwbufs

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 7 Dec 2010 08:23:26 -0800 (PST)

:I have had a patch kicking around for a while that I finally decided
:to beat into committable form, that brings the reference count into
:the m_ext structure. Currently there are very few users of M_EXT so I
:just modified them all to manage the refcount manually with atomic
:ops. Would we prefer this were functionalized, like FreeBSD has done?
:Also, It would be great if we could stuff a lwbuf into m_ext, but the
:only reasonable way I can see to do that is to add an additional
:function pointer which would be used to get the stable reference, as
:well as probably an offset, calling conventions would be slightly
:different for free in this case, and that route just doesn't feel very
:clean...  So I was wondering if anyone had any suggestions?

    Wait, embedded into m_ext?  The ref count, or the m_ext structure,
    would have to be made a pointer so multiple mbufs can reference
    the same m_ext.

					Matthew Dillon 

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