Re: Internalizing M_EXT refcounting and lwbufs
On Tue, Dec 7, 2010 at 9:23 AM, Matthew Dillon
<dillon@apollo.backplane.com> wrote:
>
> :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... 嚒o I was wondering if anyone had any suggestions?
> :
> :Thanks,
> :Sam
>
> ꀠ咗ait, embedded into m_ext? 糍he ref count, or the m_ext structure,
> ꀠ烀ould have to be made a pointer so multiple mbufs can reference
> ꀠ濳he same m_ext.
>
> ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀭMatt
> ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠ嗰atthew Dillon
> ꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀠꀼdillon@backplane.com>
>
Yeah, a kmalloc(9)'d int pointed to by the m_ext structure, versus
external as now -- sorry if I was unclear.
Sam
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