From: Jarek Poplawski <redacted>
Date: Tue, 20 Jan 2009 11:01:44 +0000

On Tue, Jan 20, 2009 at 01:31:22PM +0300, Evgeniy Polyakov wrote:

quoted

On Tue, Jan 20, 2009 at 10:20:53AM +0000, Jarek Poplawski (jarkao2@gmail.com) wrote:

quoted

Good question! Alas I can't check this soon, but if it's really like
this, of course this needs some better idea and rework. (BTW, I'd like
to prevent here as much as possible some strange activities like 1
byte (payload) packets getting full pages without any accounting.)

I believe approach to meet all our goals is to have own network memory
allocator, so that each skb could have its payload in the fragments, we
would not suffer from the heavy fragmentation and power-of-two overhead
for the larger MTUs, have a reserve for the OOM condition and generally
do not depend on the main system behaviour.

100% right! But I guess we need this current fix for -stable, and I'm
a bit worried about safety.

Jarek, we already have a page and offset you can use.

It's called sk_sndmsg_page but that is just the (current) name.
Nothing prevents you from reusing it for your purposes here.