For pollers that don't natively support interrupts, using
a busy wait mechanism temporarily.
An interrupt falicity for busy wait will
be registered for non-periodic poller.
Internally, an eventfd is created to each busy wait
poller. Write the eventfd when set interrupt mode,
and only read the eventfd when set back to poll mode,
then the busy wait poller will be called repeatly
in interrupt mode.
Change-Id: Iaeae14d1ff69fd9ef7d606a0b0a70193764513e9
Signed-off-by: Liu Xiaodong <xiaodong.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6711
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
924d4bf32d