FreeBSD/src a8ec96a (r322614)share/man/man9 sbuf.9, sys/kern subr_sbuf.c

Implement simple record boundary tracking in sbuf(9) to avoid record splitting
during drain operations. When an sbuf is configured to use this feature by way
of the SBUF_DRAINTOEOR sbuf_new() flag, top-level sections started with
sbuf_start_section() create a record boundary marker that is used to avoid
flushing partial records.

Reviewed by:    cem,imp,wblock
MFC after:      2 weeks
Sponsored by:   Netflix, Inc.
Differential Revision:  https://reviews.freebsd.org/D8536
DeltaFile
+10-2sys/kern/subr_sbuf.c
+9-1share/man/man9/sbuf.9
+2-0sys/sys/sbuf.h
+21-33 files

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