[dpdk-dev] [PATCH v3 1/6] eal: add power management intrinsics

[Stephen Hemminger]

On Fri,  4 Sep 2020 11:18:55 +0100
Liang Ma <liang.j.ma at intel.com> wrote:

> Add two new power management intrinsics, and provide an implementation
> in eal/x86 based on UMONITOR/UMWAIT instructions. The instructions
> are implemented as raw byte opcodes because there is not yet widespread
> compiler support for these instructions.
> 
> The power management instructions provide an architecture-specific
> function to either wait until a specified TSC timestamp is reached, or
> optionally wait until either a TSC timestamp is reached or a memory
> location is written to. The monitor function also provides an optional
> comparison, to avoid sleeping when the expected write has already
> happened, and no more writes are expected.
> 
> Signed-off-by: Liang Ma <liang.j.ma at intel.com>
> Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>

This looks like a useful feature but needs more documentation and example.
It would make sense to put an example in l3fwd-power.