K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2013-12-24T14:14:05.500919Z
K 7
svn:log
V 1065
A work in progress on making socket buffers capable to accept an mbufs
that are "not ready". These mbufs are now being populated by some I/O
thread in background.

sb_cc is split into sb_ccc and sb_acc.
sb_ccc means "claimed character count", it is usually of interest
for those parties that write to socket buffer and compare sb_ccc
against limits.
sb_acc means "available character count", how many data can we take
from buffer right now.

Not ready data is marked with M_NOTREADY flag. Data that stands in
the buffer beyond not ready data, but is ready itself is marked as
M_BLOCKED. To optimize things we keep pointer to the first M_NOTREADY
mbuf.

Writes to sockets can now have PRUS_NOTREADY flag, which will put
M_NOTREADY on all written data.

In the process of the change I tried to reduce lurking of various
layers in the struct sockbuf, utilizing at least inlined functions.

This isn't properly tested, just a milestone in a wip. Only TCP and
UDP are compilable, SCTP and some other kernel code are not.

Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.

END