MFC r340404, r340415, r340417, r340419 and r340420:
Synchronize epoch(9) code with -head to make merging new patches
and features easier.
The FreeBSD version has been bumped to force recompilation of
external kernel modules.
Sponsored by: Mellanox Technologies
Uninline epoch(9) entrance and exit. There is no proof that modern
processors would benefit from avoiding a function call, but bloating
code. In fact, clang created an uninlined real function for many
object files in the network stack.
- Move epoch_private.h into subr_epoch.c. Code copied exactly, avoiding any changes, including style(9).
- Remove private copies of critical_enter/exit.
Reviewed by: kib, jtl
Differential Revision: https://reviews.freebsd.org/D17879
The dualism between epoch_tracker and epoch_thread is fragile and
unnecessary. So, expose CK types to kernel and use a single normal
structure for epoch_tracker.
Reviewed by: jtl, gallatin
With epoch not inlined, there is no point in using _lite KPI. While here,
remove some unnecessary casts.
style(9), mostly adjusting overly long lines.
epoch(9) revert r340097 - no longer a need for multiple sections per cpu
I spoke with Samy Bahra and recent changes to CK to make ck_epoch_call and
ck_epoch_poll not modify the record have eliminated the need for this.