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On Sat, Mar 05, 2005 at 11:23:48AM +0100, Jaromir Dolecek wrote:
>=20
> Given this, I propose following for NetBSD m_defrag():
> * signature struct mbuf *m_defrag(struct mbuf *m0, int flags, int nseg_go=
al)
> * function returns defragmented mbuf chain on success, or NULL on failure=
=20
> * function fails if there is not enough memory to allocate new mbuf chain
>   memory (iff M_NOWAIT) or if it would not be able to meet the nseg_goal
>   fragmentation goal
> * success means the function has defragmented the mbuf chain
>   into <=3D nseg_goal continuous virtual memory segments, and the defragm=
ented
>   virtual memory segments cross the PAGE_SIZE boundary maximum
>   (nseg_goal - 1) times; this is to guarantee the result consists
>   of nseg_goal physical pages maximum
> * old mbuf chain kept intact in either success or error case
>=20
> Usage pattern would be:

[snip]

> Does this sound right?

Sounds good!

Take care,

Bill

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