commit 01740954a98f4843efca6fb69b6260c846ff05a6
Author: Matthew Dillon <[email protected]>
Date: Tue Feb 21 23:51:59 2017 -0800
kernel - Add atomic ops features
* Add <atomicop>_xacquire() and <atomicop>_xrelease() to a bunch of
atomic ops. Using this API will elide the operation using Intel's
TSX extensions (the elides are backwards compatible to cpus that do
not support TSX).
* Note however that preliminary testing using this API in the spin_lock*()
and pv_*() interfaces has only led to a reduction of performance and not
to any improvement, so at the moment we do not intend to use it. But I
did the work to add the API calls and I don't want to lose it.
Summary of changes:
sys/cpu/x86_64/include/atomic.h | 133 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 130 insertions(+), 3 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/01740954a98f4843efca6fb69b6260c846ff05a6
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