On Sat, Aug 05, 2006 at 08:09:54PM +1000, Herbert Xu ([email protected]) wrote:
> > If you can create several skbs and link them togeter you defenitely can
> > organize pages into frag_list, just get pages from different skb->data
> > and free those skbs.
>
> Having a more flexible mechanism for managing skb_shared_info->frags
> would definitely be an improvement. At the moment we can't indicate
> whether the individual frags are writable so we assume every frag to
> be read-only.
Having one page inside frag_list writable does not make a lot of sence,
so we really need either all of them writable, or nothing.
And it is much less error-prone to assume that every page is read-only.
> If we had a flag to indicate writability we could also have a flag to
> indicate that the memory comes from kmalloc rather than alloc_page.
Yes, that would be good, but who will give us a bit in the struct page?
Can we recreate frag_list elements to be a bitmasks and steal couple
of them there, so we would not increase fragment's structure size?
> Cheers,
> --
> Visit Openswan at http://www.openswan.org/
> Email: Herbert Xu ~{PmV>HI~} <[email protected]>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
Evgeniy Polyakov
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